boost::geometry::compress_variant< Variant > Struct Template Reference

Meta-function that takes a boost::variant type and tries to minimize it by doing the following: More...

#include <compress_variant.hpp>

Inheritance diagram for boost::geometry::compress_variant< Variant >:

Collaboration diagram for boost::geometry::compress_variant< Variant >:

Public Types
typedef almost_type_::type	type

Detailed Description

template<typename Variant>
struct boost::geometry::compress_variant< Variant >

Meta-function that takes a boost::variant type and tries to minimize it by doing the following:

• if there's any duplicate types, remove them
• if the result is a variant of one type, turn it into just that type

Example

typedef variant<int, float, int, long> variant_type;
typedef compress_variant<variant_type>::type compressed;
typedef mpl::vector<int, float, long> result_types;
BOOST_MPL_ASSERT(( mpl::equal<compressed::types, result_types> ));

typedef variant<int, int, int> one_type_variant_type;
typedef compress_variant<one_type_variant_type>::type single_type;
BOOST_MPL_ASSERT(( boost::equals<single_type, int> ));

Member Typedef Documentation

typedef almost_type_::type boost::mpl::if_< BOOST_MPL_AUX_NA_PARAM, BOOST_MPL_AUX_NA_PARAM, BOOST_MPL_AUX_NA_PARAM >::type

inherited

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The documentation for this struct was generated from the following file:

• boost_1_57_0/boost/geometry/util/compress_variant.hpp