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Add mp_for_each

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This commit is contained in:
Peter Dimov
2017-05-13 00:10:50 +03:00
parent d97b21261f
commit 893d84fda2
3 changed files with 99 additions and 0 deletions
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26
include/boost/mp11/algorithm.hpp
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@@ -20,6 +20,7 @@
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
#include <type_traits>
#include <utility>
namespace boost
{
@@ -823,6 +824,31 @@ template<class L, class I, class W> struct mp_replace_at_impl
template<class L, class I, class W> using mp_replace_at = typename detail::mp_replace_at_impl<L, I, W>::type;
template<class L, std::size_t I, class W> using mp_replace_at_c = typename detail::mp_replace_at_impl<L, mp_size_t<I>, W>::type;
namespace detail
{
template<class... T, class F> BOOST_CONSTEXPR F mp_for_each_impl( mp_list<T...>, F && f )
{
using A = int[sizeof...(T)];
return (void)A{ ((void)f(mp_identity<T>()), 0)... }, std::forward<F>(f);
}
#if BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
template<class F> BOOST_CONSTEXPR F mp_for_each_impl( mp_list<>, F && f )
{
return std::forward<F>(f);
}
#endif
} // namespace detail
template<class L, class F> BOOST_CONSTEXPR F mp_for_each( F && f )
{
return detail::mp_for_each_impl( mp_rename<L, mp_list>(), std::forward<F>(f) );
}
} // namespace mp11
} // namespace boost