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| author | DongHun Kwak <dh0128.kwak@samsung.com> | 2017-09-13 11:24:46 +0900 |
|---|---|---|
| committer | DongHun Kwak <dh0128.kwak@samsung.com> | 2017-09-13 11:25:39 +0900 |
| commit | 4fadd968fa12130524c8380f33fcfe25d4de79e5 (patch) | |
| tree | fd26a490cd15388d42fc6652b3c5c13012e7f93e /boost/variant/get.hpp | |
| parent | b5c87084afaef42b2d058f68091be31988a6a874 (diff) | |
| download | boost-upstream/1.65.0.tar.gz boost-upstream/1.65.0.tar.bz2 boost-upstream/1.65.0.zip | |
Imported Upstream version 1.65.0upstream/1.65.0
Change-Id: Icf8400b375482cb11bcf77440a6934ba360d6ba4
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
Diffstat (limited to 'boost/variant/get.hpp')
| -rw-r--r-- | boost/variant/get.hpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/boost/variant/get.hpp b/boost/variant/get.hpp index f3eb84dc29..fd702ba60c 100644 --- a/boost/variant/get.hpp +++ b/boost/variant/get.hpp @@ -22,9 +22,11 @@ #include <boost/utility/addressof.hpp> #include <boost/variant/variant_fwd.hpp> #include <boost/variant/detail/element_index.hpp> +#include <boost/variant/detail/move.hpp> #include <boost/type_traits/add_reference.hpp> #include <boost/type_traits/add_pointer.hpp> +#include <boost/type_traits/is_lvalue_reference.hpp> namespace boost { @@ -170,7 +172,23 @@ relaxed_get( return *result; } +#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES +template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) > +inline + U&& +relaxed_get( + boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >&& operand + BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U) + ) +{ + typedef typename add_pointer<U>::type U_ptr; + U_ptr result = relaxed_get<U>(boost::addressof(operand)); + if (!result) + boost::throw_exception(bad_get()); + return static_cast<U&&>(*result); +} +#endif ///////////////////////////////////////////////////////////////////////////////////////////////////////////// // strict_get<U>(variant) methods @@ -243,6 +261,30 @@ strict_get( return relaxed_get<U>(operand); } +#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES +template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) > +inline + U&& +strict_get( + boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >&& operand + BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U) + ) +{ + BOOST_STATIC_ASSERT_MSG( + (!boost::is_lvalue_reference<U>::value), + "remove ampersand '&' from template type U in boost::get<U>(boost::variant<T...>&&) " + ); + + BOOST_STATIC_ASSERT_MSG( + (boost::detail::variant::holds_element<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >, U >::value), + "boost::variant does not contain specified type U, " + "call to boost::get<U>(const boost::variant<T...>&) will always throw boost::bad_get exception" + ); + + return relaxed_get<U>(detail::variant::move(operand)); +} +#endif + ///////////////////////////////////////////////////////////////////////////////////////////////////////////// // get<U>(variant) methods // @@ -308,6 +350,23 @@ get( #endif } +#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES +template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) > +inline + U&& +get( + boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >&& operand + BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U) + ) +{ +#ifdef BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT + return relaxed_get<U>(detail::variant::move(operand)); +#else + return strict_get<U>(detail::variant::move(operand)); +#endif +} +#endif + } // namespace boost #endif // BOOST_VARIANT_GET_HPP |