1082 lines
24 KiB
C++
1082 lines
24 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2015 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_VALUE_HPP
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#define MAPNIK_VALUE_HPP
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// mapnik
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#include <mapnik/value_types.hpp>
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#include <mapnik/value_hash.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/util/variant.hpp>
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// stl
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#include <string>
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#include <cmath>
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#include <memory>
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#include <iosfwd>
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#include <cstddef>
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#include <new>
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// icu
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#include <unicode/unistr.h>
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#include <unicode/ustring.h>
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namespace mapnik {
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inline void to_utf8(mapnik::value_unicode_string const& input, std::string & target)
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{
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if (input.isEmpty()) return;
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const int BUF_SIZE = 256;
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char buf [BUF_SIZE];
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int len;
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UErrorCode err = U_ZERO_ERROR;
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u_strToUTF8(buf, BUF_SIZE, &len, input.getBuffer(), input.length(), &err);
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if (err == U_BUFFER_OVERFLOW_ERROR || err == U_STRING_NOT_TERMINATED_WARNING )
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{
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const std::unique_ptr<char[]> buf_ptr(new char [len+1]);
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err = U_ZERO_ERROR;
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u_strToUTF8(buf_ptr.get() , len + 1, &len, input.getBuffer(), input.length(), &err);
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target.assign(buf_ptr.get() , static_cast<std::size_t>(len));
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}
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else
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{
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target.assign(buf, static_cast<std::size_t>(len));
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}
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}
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using value_base = util::variant<value_null, value_bool, value_integer,value_double, value_unicode_string>;
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namespace impl {
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struct equals
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{
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bool operator() (value_integer lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) == rhs;
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}
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bool operator() (value_bool lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) == rhs;
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}
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bool operator() (value_double lhs, value_integer rhs) const
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{
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return lhs == static_cast<value_double>(rhs);
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}
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bool operator() (value_bool lhs, value_integer rhs) const
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{
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return static_cast<value_integer>(lhs) == rhs;
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}
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bool operator() (value_integer lhs, value_bool rhs) const
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{
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return lhs == static_cast<value_integer>(rhs);
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}
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bool operator() (value_double lhs, value_bool rhs) const
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{
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return lhs == static_cast<value_double>(rhs);
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}
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bool operator() (value_unicode_string const& lhs,
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value_unicode_string const& rhs) const
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{
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return (lhs == rhs) ? true: false;
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}
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template <typename T>
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bool operator() (T lhs, T rhs) const
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{
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return lhs == rhs;
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}
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template <typename T, typename U>
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bool operator() (T const&, U const&) const
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{
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return false;
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}
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};
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struct not_equals
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{
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template <typename T, typename U>
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bool operator() (const T &, const U &) const
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{
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return true;
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}
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template <typename T>
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bool operator() (T lhs, T rhs) const
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{
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return lhs != rhs;
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}
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bool operator() (value_bool lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) != rhs;
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}
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bool operator() (value_bool lhs, value_integer rhs) const
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{
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return static_cast<value_integer>(lhs) != rhs;
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}
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bool operator() (value_integer lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) != rhs;
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}
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bool operator() (value_double lhs, value_integer rhs) const
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{
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return lhs != static_cast<value_double>(rhs);
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}
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bool operator() (value_integer lhs, value_bool rhs) const
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{
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return lhs != static_cast<value_integer>(rhs);
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}
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bool operator() (value_double lhs, value_bool rhs) const
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{
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return lhs != static_cast<value_double>(rhs);
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}
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bool operator() (value_unicode_string const& lhs,
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value_unicode_string const& rhs) const
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{
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return (lhs != rhs)? true : false;
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}
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// back compatibility shim to equate empty string with null for != test
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// https://github.com/mapnik/mapnik/issues/1859
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// TODO - consider removing entire specialization at Mapnik 3.x
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bool operator() (value_null, value_unicode_string const& rhs) const
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{
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if (rhs.isEmpty()) return false;
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return true;
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}
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};
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struct greater_than
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return lhs > rhs;
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}
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bool operator() (value_bool lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) > rhs;
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}
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bool operator() (value_double lhs, value_bool rhs) const
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{
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return lhs > static_cast<value_double>(rhs);
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}
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bool operator() (value_bool lhs, value_integer rhs) const
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{
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return static_cast<value_integer>(lhs) > rhs;
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}
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bool operator() (value_integer lhs, value_bool rhs) const
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{
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return lhs > static_cast<value_integer>(rhs);
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}
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bool operator() (value_integer lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) > rhs;
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}
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bool operator() (value_double lhs, value_integer rhs) const
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{
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return static_cast<value_double>(lhs) > rhs;
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}
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bool operator() (value_unicode_string const& lhs, value_unicode_string const& rhs) const
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{
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return (lhs > rhs) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct greater_or_equal
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator() (T lhs, T rhs) const
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{
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return lhs >= rhs;
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}
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bool operator() (value_bool lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) >= rhs;
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}
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bool operator() (value_double lhs, value_bool rhs) const
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{
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return lhs >= static_cast<value_double>(rhs);
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}
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bool operator() (value_bool lhs, value_integer rhs) const
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{
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return static_cast<value_integer>(lhs) >= rhs;
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}
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bool operator() (value_integer lhs, value_bool rhs) const
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{
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return lhs >= static_cast<value_integer>(rhs);
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}
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bool operator() (value_integer lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) >= rhs;
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}
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bool operator() (value_double lhs, value_integer rhs) const
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{
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return lhs >= static_cast<value_double>(rhs);
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}
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bool operator() (value_unicode_string const& lhs, value_unicode_string const& rhs) const
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{
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return ( lhs >= rhs ) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct less_than
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return lhs < rhs;
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}
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bool operator() (value_bool lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) < rhs;
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}
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bool operator() (value_double lhs, value_bool rhs) const
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{
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return lhs < static_cast<value_double>(rhs);
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}
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bool operator() (value_bool lhs, value_integer rhs) const
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{
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return static_cast<value_integer>(lhs) < rhs;
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}
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bool operator() (value_integer lhs, value_bool rhs) const
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{
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return lhs < static_cast<value_integer>(rhs);
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}
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bool operator() (value_integer lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) < rhs;
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}
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bool operator() (value_double lhs, value_integer rhs) const
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{
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return lhs < static_cast<value_double>(rhs);
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}
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bool operator()(value_unicode_string const& lhs,
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value_unicode_string const& rhs ) const
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{
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return (lhs < rhs) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct less_or_equal
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return lhs <= rhs;
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}
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bool operator() (value_bool lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) <= rhs;
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}
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bool operator() (value_double lhs, value_bool rhs) const
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{
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return lhs <= static_cast<value_double>(rhs);
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}
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bool operator() (value_bool lhs, value_integer rhs) const
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{
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return static_cast<value_integer>(lhs) <= rhs;
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}
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bool operator() (value_integer lhs, value_bool rhs) const
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{
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return lhs <= static_cast<value_integer>(rhs);
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}
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bool operator() (value_integer lhs, value_double rhs) const
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{
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return static_cast<value_double>(lhs) <= rhs;
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}
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bool operator() (value_double lhs, value_integer rhs) const
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{
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return lhs <= static_cast<value_double>(rhs);
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}
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bool operator()(value_unicode_string const& lhs,
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value_unicode_string const& rhs ) const
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{
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return (lhs <= rhs) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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template <typename V>
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struct add
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{
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using value_type = V;
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value_type operator() (value_unicode_string const& lhs ,
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value_unicode_string const& rhs ) const
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{
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return lhs + rhs;
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}
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value_type operator() (value_double lhs, value_integer rhs) const
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{
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return lhs + rhs;
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}
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value_type operator() (value_integer lhs, value_double rhs) const
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{
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return lhs + rhs;
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}
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value_type operator() (value_unicode_string const& lhs, value_null) const
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{
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return lhs;
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}
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value_type operator() (value_null, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename R>
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value_type operator() (value_unicode_string const& lhs, R const& rhs) const
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{
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std::string val;
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if (util::to_string(val,rhs))
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return lhs + value_unicode_string(val.c_str());
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return lhs;
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}
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template <typename L>
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value_type operator() (L const& lhs , value_unicode_string const& rhs) const
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{
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std::string val;
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if (util::to_string(val,lhs))
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return value_unicode_string(val.c_str()) + rhs;
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return rhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs + rhs ;
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}
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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value_type operator() (value_bool lhs, value_bool rhs) const
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{
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return value_integer(lhs + rhs);
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}
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};
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template <typename V>
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struct sub
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{
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using value_type = V;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs - rhs ;
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}
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value_type operator() (value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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value_type operator() (value_double lhs, value_integer rhs) const
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{
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return lhs - rhs;
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}
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value_type operator() (value_integer lhs, value_double rhs) const
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{
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return lhs - rhs;
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}
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value_type operator() (value_bool lhs, value_bool rhs) const
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{
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return value_integer(lhs - rhs);
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}
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};
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template <typename V>
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struct mult
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{
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using value_type = V;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs , T2 const& ) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs * rhs;
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}
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value_type operator() (value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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value_type operator() (value_double lhs, value_integer rhs) const
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{
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return lhs * rhs;
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}
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value_type operator() (value_integer lhs, value_double rhs) const
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{
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return lhs * rhs;
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}
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value_type operator() (value_bool, value_bool) const
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{
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return value_integer(0);
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}
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};
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template <typename V>
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struct div
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{
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using value_type = V;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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if (rhs == 0) return value_type();
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return lhs / rhs;
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}
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value_type operator() (value_bool, value_bool) const
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{
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return false;
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}
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value_type operator() (value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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value_type operator() (value_double lhs, value_integer rhs) const
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{
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if (rhs == 0) return value_type();
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return lhs / rhs;
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}
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value_type operator() (value_integer lhs, value_double rhs) const
|
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{
|
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if (rhs == 0) return value_type();
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return lhs / rhs;
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}
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};
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|
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template <typename V>
|
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struct mod
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|
{
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using value_type = V;
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template <typename T1, typename T2>
|
|
value_type operator() (T1 const& lhs, T2 const&) const
|
|
{
|
|
return lhs;
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|
}
|
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|
|
template <typename T>
|
|
value_type operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs % rhs;
|
|
}
|
|
|
|
value_type operator() (value_unicode_string const&,
|
|
value_unicode_string const&) const
|
|
{
|
|
return value_type();
|
|
}
|
|
|
|
value_type operator() (value_bool,
|
|
value_bool) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
value_type operator() (value_double lhs, value_integer rhs) const
|
|
{
|
|
return std::fmod(lhs, static_cast<value_double>(rhs));
|
|
}
|
|
|
|
value_type operator() (value_integer lhs, value_double rhs) const
|
|
{
|
|
return std::fmod(static_cast<value_double>(lhs), rhs);
|
|
}
|
|
|
|
value_type operator() (value_double lhs, value_double rhs) const
|
|
{
|
|
return std::fmod(lhs, rhs);
|
|
}
|
|
};
|
|
|
|
template <typename V>
|
|
struct negate
|
|
{
|
|
using value_type = V;
|
|
|
|
template <typename T>
|
|
value_type operator() (T val) const
|
|
{
|
|
return -val;
|
|
}
|
|
|
|
value_type operator() (value_null val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
value_type operator() (value_bool val) const
|
|
{
|
|
return val ? value_integer(-1) : value_integer(0);
|
|
}
|
|
|
|
value_type operator() (value_unicode_string const&) const
|
|
{
|
|
return value_type();
|
|
}
|
|
};
|
|
|
|
// converters
|
|
template <typename T>
|
|
struct convert {};
|
|
|
|
template <>
|
|
struct convert<value_bool>
|
|
{
|
|
value_bool operator() (value_bool val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
value_bool operator() (value_unicode_string const& ustr) const
|
|
{
|
|
return !ustr.isEmpty();
|
|
}
|
|
|
|
value_bool operator() (value_null const&) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
value_bool operator() (T val) const
|
|
{
|
|
return val > 0 ? true : false;
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct convert<value_double>
|
|
{
|
|
value_double operator() (value_double val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
value_double operator() (value_integer val) const
|
|
{
|
|
return static_cast<value_double>(val);
|
|
}
|
|
|
|
value_double operator() (value_bool val) const
|
|
{
|
|
return static_cast<value_double>(val);
|
|
}
|
|
|
|
value_double operator() (std::string const& val) const
|
|
{
|
|
value_double result;
|
|
if (util::string2double(val,result))
|
|
return result;
|
|
return 0;
|
|
}
|
|
|
|
value_double operator() (value_unicode_string const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return operator()(utf8);
|
|
}
|
|
|
|
value_double operator() (value_null const&) const
|
|
{
|
|
return 0.0;
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct convert<value_integer>
|
|
{
|
|
value_integer operator() (value_integer val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
value_integer operator() (value_double val) const
|
|
{
|
|
return static_cast<value_integer>(rint(val));
|
|
}
|
|
|
|
value_integer operator() (value_bool val) const
|
|
{
|
|
return static_cast<value_integer>(val);
|
|
}
|
|
|
|
value_integer operator() (std::string const& val) const
|
|
{
|
|
value_integer result;
|
|
if (util::string2int(val,result))
|
|
return result;
|
|
return value_integer(0);
|
|
}
|
|
|
|
value_integer operator() (value_unicode_string const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return operator()(utf8);
|
|
}
|
|
|
|
value_integer operator() (value_null const&) const
|
|
{
|
|
return value_integer(0);
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct convert<std::string>
|
|
{
|
|
template <typename T>
|
|
std::string operator() (T val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str, val);
|
|
return str;
|
|
}
|
|
|
|
// specializations
|
|
std::string operator() (value_unicode_string const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return utf8;
|
|
}
|
|
|
|
std::string operator() (value_double val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str, val); // TODO set precision(16)
|
|
return str;
|
|
}
|
|
|
|
std::string operator() (value_bool val) const
|
|
{
|
|
return val ? "true": "false";
|
|
}
|
|
|
|
std::string operator() (value_null const&) const
|
|
{
|
|
return "";
|
|
}
|
|
};
|
|
|
|
struct to_unicode
|
|
{
|
|
|
|
template <typename T>
|
|
value_unicode_string operator() (T val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str,val);
|
|
return value_unicode_string(str.c_str());
|
|
}
|
|
|
|
// specializations
|
|
value_unicode_string const& operator() (value_unicode_string const& val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
value_unicode_string operator() (value_double val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str,val);
|
|
return value_unicode_string(str.c_str());
|
|
}
|
|
|
|
value_unicode_string operator() (value_bool val) const
|
|
{
|
|
if (val) {
|
|
std::string str("true");
|
|
return value_unicode_string(str.c_str());
|
|
}
|
|
std::string str("false");
|
|
return value_unicode_string(str.c_str());
|
|
}
|
|
|
|
value_unicode_string operator() (value_null const&) const
|
|
{
|
|
return value_unicode_string("");
|
|
}
|
|
};
|
|
|
|
struct to_expression_string
|
|
{
|
|
explicit to_expression_string(char quote = '\'')
|
|
: quote_(quote) {}
|
|
|
|
std::string operator() (value_unicode_string const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return quote_ + utf8 + quote_;
|
|
}
|
|
|
|
std::string operator() (value_integer val) const
|
|
{
|
|
std::string output;
|
|
util::to_string(output,val);
|
|
return output;
|
|
}
|
|
|
|
std::string operator() (value_double val) const
|
|
{
|
|
std::string output;
|
|
util::to_string(output,val); // TODO precision(16)
|
|
return output;
|
|
}
|
|
|
|
std::string operator() (value_bool val) const
|
|
{
|
|
return val ? "true":"false";
|
|
}
|
|
|
|
std::string operator() (value_null const&) const
|
|
{
|
|
return "null";
|
|
}
|
|
|
|
const char quote_;
|
|
};
|
|
|
|
} // namespace impl
|
|
|
|
namespace value_adl_barrier {
|
|
|
|
class value : public value_base
|
|
{
|
|
friend const value operator+(value const&,value const&);
|
|
friend const value operator-(value const&,value const&);
|
|
friend const value operator*(value const&,value const&);
|
|
friend const value operator/(value const&,value const&);
|
|
friend const value operator%(value const&,value const&);
|
|
|
|
public:
|
|
value () noexcept //-- comment out for VC++11
|
|
: value_base(value_null()) {}
|
|
|
|
value (value const& other) = default;
|
|
|
|
value( value && other) noexcept = default;
|
|
|
|
template <typename T>
|
|
value ( T const& val)
|
|
: value_base(typename detail::mapnik_value_type<T>::type(val)) {}
|
|
|
|
template <typename T>
|
|
value ( T && val)
|
|
: value_base(typename detail::mapnik_value_type<T>::type(val)) {}
|
|
|
|
value & operator=( value const& other) = default;
|
|
|
|
bool operator==(value const& other) const
|
|
{
|
|
return util::apply_visitor(impl::equals(),*this,other);
|
|
}
|
|
|
|
bool operator!=(value const& other) const
|
|
{
|
|
return util::apply_visitor(impl::not_equals(),*this,other);
|
|
}
|
|
|
|
bool operator>(value const& other) const
|
|
{
|
|
return util::apply_visitor(impl::greater_than(),*this,other);
|
|
}
|
|
|
|
bool operator>=(value const& other) const
|
|
{
|
|
return util::apply_visitor(impl::greater_or_equal(),*this,other);
|
|
}
|
|
|
|
bool operator<(value const& other) const
|
|
{
|
|
return util::apply_visitor(impl::less_than(),*this,other);
|
|
}
|
|
|
|
bool operator<=(value const& other) const
|
|
{
|
|
return util::apply_visitor(impl::less_or_equal(),*this,other);
|
|
}
|
|
|
|
value operator- () const
|
|
{
|
|
return util::apply_visitor(impl::negate<value>(), *this);
|
|
}
|
|
|
|
bool is_null() const;
|
|
|
|
template <typename T>
|
|
T convert() const
|
|
{
|
|
return util::apply_visitor(impl::convert<T>(),*this);
|
|
}
|
|
|
|
value_bool to_bool() const
|
|
{
|
|
return util::apply_visitor(impl::convert<value_bool>(),*this);
|
|
}
|
|
|
|
std::string to_expression_string(char quote = '\'') const
|
|
{
|
|
return util::apply_visitor(impl::to_expression_string(quote),*this);
|
|
}
|
|
|
|
std::string to_string() const
|
|
{
|
|
return util::apply_visitor(impl::convert<std::string>(),*this);
|
|
}
|
|
|
|
value_unicode_string to_unicode() const
|
|
{
|
|
return util::apply_visitor(impl::to_unicode(),*this);
|
|
}
|
|
|
|
value_double to_double() const
|
|
{
|
|
return util::apply_visitor(impl::convert<value_double>(),*this);
|
|
}
|
|
|
|
value_integer to_int() const
|
|
{
|
|
return util::apply_visitor(impl::convert<value_integer>(),*this);
|
|
}
|
|
};
|
|
|
|
inline const value operator+(value const& p1,value const& p2)
|
|
{
|
|
return value(util::apply_visitor(impl::add<value>(),p1, p2));
|
|
}
|
|
|
|
inline const value operator-(value const& p1,value const& p2)
|
|
{
|
|
return value(util::apply_visitor(impl::sub<value>(),p1, p2));
|
|
}
|
|
|
|
inline const value operator*(value const& p1,value const& p2)
|
|
{
|
|
return value(util::apply_visitor(impl::mult<value>(),p1, p2));
|
|
}
|
|
|
|
inline const value operator/(value const& p1,value const& p2)
|
|
{
|
|
return value(util::apply_visitor(impl::div<value>(),p1, p2));
|
|
}
|
|
|
|
inline const value operator%(value const& p1,value const& p2)
|
|
{
|
|
return value(util::apply_visitor(impl::mod<value>(),p1, p2));
|
|
}
|
|
|
|
template <typename charT, typename traits>
|
|
inline std::basic_ostream<charT,traits>&
|
|
operator << (std::basic_ostream<charT,traits>& out,
|
|
value const& v)
|
|
{
|
|
out << v.to_string();
|
|
return out;
|
|
}
|
|
|
|
// hash function
|
|
inline std::size_t hash_value(value const& val)
|
|
{
|
|
return mapnik_hash_value(val);
|
|
}
|
|
|
|
} // namespace value_adl_barrier
|
|
|
|
using value_adl_barrier::value;
|
|
|
|
namespace detail {
|
|
|
|
struct is_null_visitor
|
|
{
|
|
bool operator() (value const& val) const
|
|
{
|
|
return val.is_null();
|
|
}
|
|
|
|
bool operator() (value_null const&) const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator() (T const&) const
|
|
{
|
|
return false;
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
inline bool value::is_null() const
|
|
{
|
|
return util::apply_visitor(mapnik::detail::is_null_visitor(), *this);
|
|
}
|
|
|
|
} // namespace mapnik
|
|
|
|
// support for std::unordered_xxx
|
|
namespace std
|
|
{
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wmismatched-tags"
|
|
|
|
template <>
|
|
struct hash<mapnik::value>
|
|
{
|
|
size_t operator()(mapnik::value const& val) const
|
|
{
|
|
return mapnik::mapnik_hash_value(val);
|
|
}
|
|
};
|
|
|
|
#pragma GCC diagnostic pop
|
|
|
|
}
|
|
|
|
#endif // MAPNIK_VALUE_HPP
|