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Made wkt write variant-aware.

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[SVN r82481]
This commit is contained in:
Bruno Lalande
2013-01-13 17:25:15 +00:00
parent d575690df3
commit 2da1ca09d1
2 changed files with 57 additions and 5 deletions
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46
include/boost/geometry/io/wkt/write.hpp
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@@ -33,6 +33,10 @@
#include <boost/geometry/io/wkt/detail/prefix.hpp>
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/variant_fwd.hpp>
namespace boost { namespace geometry
{
@@ -307,6 +311,46 @@ struct wkt<Polygon, polygon_tag>
{};
template <typename Geometry>
struct devarianted_wkt
{
template <typename OutputStream>
static inline void apply(OutputStream& os, Geometry const& geometry)
{
wkt<Geometry>::apply(os, geometry);
}
};
template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct devarianted_wkt<variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
template <typename OutputStream>
struct visitor: static_visitor<void>
{
OutputStream& m_os;
visitor(OutputStream& os)
: m_os(os)
{}
template <typename Geometry>
inline void operator()(Geometry const& geometry) const
{
devarianted_wkt<Geometry>::apply(m_os, geometry);
}
};
template <typename OutputStream>
static inline void apply(
OutputStream& os,
variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry
)
{
apply_visitor(visitor<OutputStream>(os), geometry);
}
};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
@@ -335,7 +379,7 @@ public:
std::basic_ostream<Char, Traits>& os,
wkt_manipulator const& m)
{
dispatch::wkt<Geometry>::apply(os, m.m_geometry);
dispatch::devarianted_wkt<Geometry>::apply(os, m.m_geometry);
os.flush();
return os;
}