to_string() : added specialization for double values with increased precision.

This commit is contained in:
Artem Pavlenko 2007-01-26 15:50:39 +00:00
parent 560a875a88
commit 1e710ceab3

View file

@ -28,425 +28,443 @@
#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
// boost
#include <boost/variant.hpp>
namespace mapnik {
typedef boost::variant<int,double,std::string> value_base;
namespace impl {
struct equals
: public boost::static_visitor<bool>
{
typedef boost::variant<int,double,std::string> value_base;
namespace impl {
struct equals
: public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator() (const T &, const U & ) const
{
return false;
}
bool operator() (const T &, const U & ) const
{
return false;
}
template <typename T>
bool operator() (T lhs, T rhs) const
{
return lhs == rhs;
}
{
return lhs == rhs;
}
bool operator() (int lhs, double rhs) const
{
return lhs == rhs;
}
{
return lhs == rhs;
}
bool operator() (double lhs, int rhs) const
{
return lhs == rhs;
}
{
return lhs == rhs;
}
bool operator() (std::string const& lhs,
std::string const& rhs) const
{
return lhs == rhs;
}
};
struct greater_than
: public boost::static_visitor<bool>
{
{
return lhs == rhs;
}
};
struct greater_than
: public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator()( const T &, const U & ) const
{
return false;
}
{
return false;
}
template <typename T>
bool operator()( T lhs, T rhs ) const
{
return lhs > rhs;
}
{
return lhs > rhs;
}
bool operator() (int lhs, double rhs) const
{
return lhs > rhs;
}
{
return lhs > rhs;
}
bool operator() (double lhs, int rhs) const
{
return lhs > rhs;
}
{
return lhs > rhs;
}
bool operator() (std::string const& lhs, std::string const& rhs) const
{
return lhs > rhs;
}
};
{
return lhs > rhs;
}
};
struct greater_or_equal
: public boost::static_visitor<bool>
{
struct greater_or_equal
: public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator()( const T &, const U & ) const
{
return false;
}
{
return false;
}
template <typename T>
bool operator() (T lhs, T rhs) const
{
return lhs >= rhs;
}
{
return lhs >= rhs;
}
bool operator() (int lhs, double rhs) const
{
return lhs >= rhs;
}
{
return lhs >= rhs;
}
bool operator() (double lhs, int rhs) const
{
return lhs >= rhs;
}
{
return lhs >= rhs;
}
bool operator() (std::string const& lhs, std::string const& rhs ) const
{
return lhs >= rhs;
}
};
{
return lhs >= rhs;
}
};
struct less_than
: public boost::static_visitor<bool>
{
struct less_than
: public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator()( const T &, const U & ) const
{
return false;
}
{
return false;
}
template <typename T>
bool operator()( T lhs,T rhs) const
{
return lhs < rhs;
}
{
return lhs < rhs;
}
bool operator() (int lhs, double rhs) const
{
return lhs < rhs;
}
{
return lhs < rhs;
}
bool operator() (double lhs, int rhs) const
{
return lhs < rhs;
}
{
return lhs < rhs;
}
bool operator()( std::string const& lhs,
std::string const& rhs ) const
{
return lhs < rhs;
}
};
{
return lhs < rhs;
}
};
struct less_or_equal
: public boost::static_visitor<bool>
{
struct less_or_equal
: public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator()( const T &, const U & ) const
{
return false;
}
{
return false;
}
template <typename T>
bool operator()(T lhs, T rhs ) const
{
return lhs <= rhs;
}
{
return lhs <= rhs;
}
bool operator() (int lhs, double rhs) const
{
return lhs <= rhs;
}
{
return lhs <= rhs;
}
bool operator() (double lhs, int rhs) const
{
return lhs <= rhs;
}
{
return lhs <= rhs;
}
template <typename T>
bool operator()( std::string const& lhs,
std::string const& rhs ) const
{
return lhs <= rhs;
}
};
{
return lhs <= rhs;
}
};
template <typename V>
struct add : public boost::static_visitor<V>
{
template <typename V>
struct add : public boost::static_visitor<V>
{
typedef V value_type;
template <typename T1, typename T2>
value_type operator() (T1 const& lhs, T2 const&) const
{
return lhs;
}
{
return lhs;
}
template <typename T>
value_type operator() (T lhs, T rhs) const
{
return lhs + rhs ;
}
{
return lhs + rhs ;
}
value_type operator() (std::string const& lhs ,
std::string const& rhs ) const
{
return lhs + rhs;
}
{
return lhs + rhs;
}
value_type operator() (double lhs, int rhs) const
{
return lhs + rhs;
}
{
return lhs + rhs;
}
value_type operator() (int lhs, double rhs) const
{
return lhs + rhs;
}
};
template <typename V>
struct sub : public boost::static_visitor<V>
{
{
return lhs + rhs;
}
};
template <typename V>
struct sub : public boost::static_visitor<V>
{
typedef V value_type;
template <typename T1, typename T2>
value_type operator() (T1 const& lhs, T2 const&) const
{
return lhs;
}
{
return lhs;
}
template <typename T>
value_type operator() (T lhs, T rhs) const
{
return lhs - rhs ;
}
{
return lhs - rhs ;
}
value_type operator() (std::string const& lhs,
std::string const& ) const
{
return lhs;
}
{
return lhs;
}
value_type operator() (double lhs, int rhs) const
{
return lhs - rhs;
}
{
return lhs - rhs;
}
value_type operator() (int lhs, double rhs) const
{
return lhs - rhs;
}
};
{
return lhs - rhs;
}
};
template <typename V>
struct mult : public boost::static_visitor<V>
{
template <typename V>
struct mult : public boost::static_visitor<V>
{
typedef V value_type;
template <typename T1, typename T2>
value_type operator() (T1 const& lhs , T2 const& ) const
{
return lhs;
}
{
return lhs;
}
template <typename T>
value_type operator() (T lhs, T rhs) const
{
return lhs * rhs;
}
{
return lhs * rhs;
}
value_type operator() (std::string const& lhs,
std::string const& ) const
{
return lhs;
}
{
return lhs;
}
value_type operator() (double lhs, int rhs) const
{
return lhs * rhs;
}
{
return lhs * rhs;
}
value_type operator() (int lhs, double rhs) const
{
return lhs * rhs;
}
};
{
return lhs * rhs;
}
};
template <typename V>
struct div: public boost::static_visitor<V>
{
template <typename V>
struct div: public boost::static_visitor<V>
{
typedef V value_type;
template <typename T1, typename T2>
value_type operator() (T1 const& lhs, T2 const&) const
{
return lhs;
}
{
return lhs;
}
template <typename T>
value_type operator() (T lhs, T rhs) const
{
return lhs / rhs;
}
{
return lhs / rhs;
}
value_type operator() (std::string const& lhs,
std::string const&) const
{
return lhs;
}
{
return lhs;
}
value_type operator() (double lhs, int rhs) const
{
return lhs / rhs;
}
{
return lhs / rhs;
}
value_type operator() (int lhs, double rhs) const
{
return lhs / rhs;
}
};
{
return lhs / rhs;
}
};
struct to_string : public boost::static_visitor<std::string>
{
struct to_string : public boost::static_visitor<std::string>
{
template <typename T>
std::string operator() (T val) const
{
std::stringstream ss;
ss << val;
return ss.str();
}
{
std::stringstream ss;
ss << val;
return ss.str();
}
// specializations
std::string const& operator() (std::string const& val) const
{
return val;
}
std::string operator() (double val) const
{
return val;
std::stringstream ss;
ss << std::setprecision(16) << val;
return ss.str();
}
};
};
struct to_expression_string : public boost::static_visitor<std::string>
{
struct to_expression_string : public boost::static_visitor<std::string>
{
std::string operator() (std::string const& val) const
{
return "'" + val + "'";
}
template <typename T>
std::string operator() (T val) const
{
std::stringstream ss;
ss << val;
return ss.str();
}
std::string operator() (double val) const
{
std::stringstream ss;
ss << val;
return ss.str();
}
std::string operator() (std::string const& val) const
{
return "'" + val + "'";
std::stringstream ss;
ss << std::setprecision(16) << val;
return ss.str();
}
};
}
};
}
class value
{
value_base 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&);
class value
{
value_base 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&);
public:
value ()
public:
value ()
: base_(0) {}
template <typename T> value(T _val_)
template <typename T> value(T _val_)
: base_(_val_) {}
bool operator==(value const& other) const
{
return boost::apply_visitor(impl::equals(),base_,other.base_);
}
bool operator==(value const& other) const
{
return boost::apply_visitor(impl::equals(),base_,other.base_);
}
bool operator!=(value const& other) const
{
return !(boost::apply_visitor(impl::equals(),base_,other.base_));
}
bool operator!=(value const& other) const
{
return !(boost::apply_visitor(impl::equals(),base_,other.base_));
}
bool operator>(value const& other) const
{
return boost::apply_visitor(impl::greater_than(),base_,other.base_);
}
bool operator>(value const& other) const
{
return boost::apply_visitor(impl::greater_than(),base_,other.base_);
}
bool operator>=(value const& other) const
{
return boost::apply_visitor(impl::greater_or_equal(),base_,other.base_);
}
bool operator>=(value const& other) const
{
return boost::apply_visitor(impl::greater_or_equal(),base_,other.base_);
}
bool operator<(value const& other) const
{
return boost::apply_visitor(impl::less_than(),base_,other.base_);
}
bool operator<(value const& other) const
{
return boost::apply_visitor(impl::less_than(),base_,other.base_);
}
bool operator<=(value const& other) const
{
return boost::apply_visitor(impl::less_or_equal(),base_,other.base_);
}
value_base const& base() const
{
return base_;
}
bool operator<=(value const& other) const
{
return boost::apply_visitor(impl::less_or_equal(),base_,other.base_);
}
value_base const& base() const
{
return base_;
}
std::string to_expression_string() const
{
return boost::apply_visitor(impl::to_expression_string(),base_);
}
std::string to_expression_string() const
{
return boost::apply_visitor(impl::to_expression_string(),base_);
}
std::string to_string() const
{
return boost::apply_visitor(impl::to_string(),base_);
}
};
std::string to_string() const
{
return boost::apply_visitor(impl::to_string(),base_);
}
};
inline const value operator+(value const& p1,value const& p2)
{
inline const value operator+(value const& p1,value const& p2)
{
return value(boost::apply_visitor(impl::add<value>(),p1.base_, p2.base_));
}
return value(boost::apply_visitor(impl::add<value>(),p1.base_, p2.base_));
}
inline const value operator-(value const& p1,value const& p2)
{
inline const value operator-(value const& p1,value const& p2)
{
return value(boost::apply_visitor(impl::sub<value>(),p1.base_, p2.base_));
}
return value(boost::apply_visitor(impl::sub<value>(),p1.base_, p2.base_));
}
inline const value operator*(value const& p1,value const& p2)
{
inline const value operator*(value const& p1,value const& p2)
{
return value(boost::apply_visitor(impl::mult<value>(),p1.base_, p2.base_));
}
return value(boost::apply_visitor(impl::mult<value>(),p1.base_, p2.base_));
}
inline const value operator/(value const& p1,value const& p2)
{
inline const value operator/(value const& p1,value const& p2)
{
return value(boost::apply_visitor(impl::div<value>(),p1.base_, p2.base_));
}
return value(boost::apply_visitor(impl::div<value>(),p1.base_, p2.base_));
}
template <typename charT, typename traits>
inline std::basic_ostream<charT,traits>&
operator << (std::basic_ostream<charT,traits>& out,
value const& v)
{
out << v.base();
return out;
}
template <typename charT, typename traits>
inline std::basic_ostream<charT,traits>&
operator << (std::basic_ostream<charT,traits>& out,
value const& v)
{
out << v.base();
return out;
}
}
#endif //VALUE_HPP