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Add mp_same.

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This commit is contained in:
Peter Dimov
2017-04-01 20:01:51 +03:00
parent c34e1520e5
commit 28c420edf7
3 changed files with 55 additions and 0 deletions
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21
include/boost/mp11/function.hpp
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@@ -12,6 +12,7 @@
#include <boost/mp11/utility.hpp>
#include <boost/mp11/detail/mp_list.hpp>
#include <boost/mp11/detail/mp_count.hpp>
#include <type_traits>
namespace boost
{
@@ -84,6 +85,26 @@ template<class T1, class... T> struct mp_or_impl<T1, T...>
} // namespace detail
// mp_same<T...>
namespace detail
{
template<class... T> struct mp_same_impl;
template<> struct mp_same_impl<>
{
using type = mp_true;
};
template<class T1, class... T> struct mp_same_impl<T1, T...>
{
using type = mp_all<std::is_same<T1, T>...>;
};
} // namespace detail
template<class... T> using mp_same = typename detail::mp_same_impl<T...>::type;
} // namespace mp11
} // namespace boost