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optimize expression evaluation of text by avoiding extra copy

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This commit is contained in:
Dane Springmeyer 2013-09-15 23:18:11 -07:00
parent d3ab601e30
commit 1dd12755c6
2 changed files with 36 additions and 17 deletions
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24
include/mapnik/expression_evaluator.hpp
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@ -47,9 +47,29 @@ struct evaluate : boost::static_visitor<T1>
explicit evaluate(feature_type const& f)
: feature_(f) {}
value_type operator() (value_type x) const
value_integer operator() (value_integer val) const
{
return x;
return val;
}
value_double operator() (value_double val) const
{
return val;
}
value_bool operator() (value_bool val) const
{
return val;
}
value_null operator() (value_null val) const
{
return val;
}
value_unicode_string const& operator() (value_unicode_string const& str) const
{
return str;
}
value_type operator() (attribute const& attr) const

29
include/mapnik/expression_node_types.hpp
View file

@ -24,24 +24,17 @@
#define MAPNIK_EXPRESSION_NODE_TYPES_HPP
// mapnik
//#include <mapnik/value.hpp>
//#include <mapnik/attribute.hpp>
#include <mapnik/value_types.hpp>
#include <mapnik/value.hpp>
#include <mapnik/attribute.hpp>
// boost
#include <boost/variant/variant_fwd.hpp>
namespace boost { template <typename T> class recursive_wrapper; }
#include <boost/mpl/vector/vector30.hpp>
#include <boost/variant.hpp>
namespace mapnik
{
struct attribute;
struct geometry_type_attribute;
namespace value_adl_barrier {
class value;
}
using value_adl_barrier::value;
namespace tags {
struct negate
{
@ -174,8 +167,12 @@ struct regex_replace_node;
typedef mapnik::value value_type;
typedef boost::variant <
value_type,
typedef boost::mpl::vector24<
value_null,
value_bool,
value_integer,
value_double,
value_unicode_string,
attribute,
geometry_type_attribute,
boost::recursive_wrapper<unary_node<tags::negate> >,
@ -195,7 +192,9 @@ boost::recursive_wrapper<binary_node<tags::logical_and> >,
boost::recursive_wrapper<binary_node<tags::logical_or> >,
boost::recursive_wrapper<regex_match_node>,
boost::recursive_wrapper<regex_replace_node>
> expr_node;
>::type expr_types;
typedef boost::make_recursive_variant_over<expr_types>::type expr_node;
}