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Change mp_and/mp_or to a SFINAE-based implementation

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This commit is contained in:
Peter Dimov
2017-05-23 23:25:30 +03:00
parent dc0faed438
commit 07cac40f3d
5 changed files with 118 additions and 58 deletions
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68
include/boost/mp11/function.hpp
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@@ -19,10 +19,10 @@ namespace boost
namespace mp11
{
// mp_all<T...>
template<class... T> using mp_all = mp_bool< mp_count_if< mp_list<T...>, mp_to_bool >::value == sizeof...(T) >;
// mp_and<T...>, mp_all<T...>
#if BOOST_WORKAROUND( BOOST_MSVC, < 1900 )
// mp_and<T...>
namespace detail
{
@@ -30,7 +30,7 @@ template<class... T> struct mp_and_impl;
} // namespace detail
template<class... T> using mp_and = typename detail::mp_and_impl<T...>::type;
template<class... T> using mp_and = mp_to_bool< typename detail::mp_and_impl<T...>::type >;
namespace detail
{
@@ -52,10 +52,36 @@ template<class T1, class... T> struct mp_and_impl<T1, T...>
} // namespace detail
// mp_any<T...>
template<class... T> using mp_any = mp_bool< mp_count_if< mp_list<T...>, mp_to_bool >::value != 0 >;
template<class... T> using mp_all = mp_bool< mp_count_if< mp_list<T...>, mp_to_bool >::value == sizeof...(T) >;
#else
namespace detail
{
template<class L, class E = void> struct mp_and_impl
{
using type = mp_false;
};
void mp_and_impl_f(...);
template<class... T> struct mp_and_impl< mp_list<T...>, decltype( mp_and_impl_f( mp_if<T, int>()... ) ) >
{
using type = mp_true;
};
} // namespace detail
template<class... T> using mp_and = typename detail::mp_and_impl<mp_list<T...>>::type;
template<class... T> using mp_all = typename detail::mp_and_impl<mp_list<T...>>::type;
#endif
// mp_or<T...>, mp_any<T...>
#if BOOST_WORKAROUND( BOOST_MSVC, < 1900 )
// mp_or<T...>
namespace detail
{
@@ -63,7 +89,7 @@ template<class... T> struct mp_or_impl;
} // namespace detail
template<class... T> using mp_or = typename detail::mp_or_impl<T...>::type;
template<class... T> using mp_or = mp_to_bool< typename detail::mp_or_impl<T...>::type >;
namespace detail
{
@@ -85,6 +111,32 @@ template<class T1, class... T> struct mp_or_impl<T1, T...>
} // namespace detail
template<class... T> using mp_any = mp_bool< mp_count_if< mp_list<T...>, mp_to_bool >::value != 0 >;
#else
namespace detail
{
template<class L, class E = void> struct mp_or_impl
{
using type = mp_true;
};
void mp_and_impl_f(...);
template<class... T> struct mp_or_impl< mp_list<T...>, decltype( mp_and_impl_f( mp_if<mp_not<T>, int>()... ) ) >
{
using type = mp_false;
};
} // namespace detail
template<class... T> using mp_or = typename detail::mp_or_impl<mp_list<T...>>::type;
template<class... T> using mp_any = typename detail::mp_or_impl<mp_list<T...>>::type;
#endif
// mp_same<T...>
namespace detail
{