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Add fold expr implementations of mp_count, mp_count_if

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This commit is contained in:
Peter Dimov
2017-03-23 19:34:43 +02:00
parent 72c9c49224
commit 848c2ff82c
1 changed files with 16 additions and 2 deletions
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18
include/boost/mp11/detail/mp_count.hpp
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@@ -24,7 +24,14 @@ namespace detail
template<class L, class V> struct mp_count_impl; template<class L, class V> struct mp_count_impl;
#if !defined( BOOST_MP11_NO_CONSTEXPR ) #if defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS )
template<template<class...> class L, class... T, class V> struct mp_count_impl<L<T...>, V>
{
using type = mp_size_t<(std::is_same<T, V>::value + ... + 0)>;
};
#elif !defined( BOOST_MP11_NO_CONSTEXPR )
constexpr std::size_t cx_plus() constexpr std::size_t cx_plus()
{ {
@@ -66,7 +73,14 @@ namespace detail
template<class L, template<class...> class P> struct mp_count_if_impl; template<class L, template<class...> class P> struct mp_count_if_impl;
#if !defined( BOOST_MP11_NO_CONSTEXPR ) #if defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS )
template<template<class...> class L, class... T, template<class...> class P> struct mp_count_if_impl<L<T...>, P>
{
using type = mp_size_t<(mp_to_bool<P<T>>::value + ... + 0)>;
};
#elif !defined( BOOST_MP11_NO_CONSTEXPR )
template<template<class...> class L, class... T, template<class...> class P> struct mp_count_if_impl<L<T...>, P> template<template<class...> class L, class... T, template<class...> class P> struct mp_count_if_impl<L<T...>, P>
{ {