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Add mp_find_index_if.

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This commit is contained in:
Peter Dimov
2015-07-15 17:30:07 +03:00
parent 856ae3dc6c
commit f1b097eb06
3 changed files with 114 additions and 0 deletions
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54
include/boost/mp11/algorithm.hpp
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@@ -558,6 +558,60 @@ template<template<class...> class L, class T1, class... T, class V> struct mp_fi
template<class L, class V> using mp_find_index = typename detail::mp_find_index_impl<L, V>::type;
// mp_find_index_if<L, P>
namespace detail
{
template<class L, template<class...> class P> struct mp_find_index_if_impl;
#if !defined( BOOST_NO_CXX11_CONSTEXPR )
template<template<class...> class L, template<class...> class P> struct mp_find_index_if_impl<L<>, P>
{
using type = mp_size_t<0>;
};
template<template<class...> class L, class... T, template<class...> class P> struct mp_find_index_if_impl<L<T...>, P>
{
static constexpr bool _v[] = { P<T>::value... };
using type = mp_size_t< cx_find_index( _v, _v + sizeof...(T) ) >;
};
#else
#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
template<template<class...> class L, class... T, template<class...> class P> struct mp_find_index_if_impl<L<T...>, P>
{
static_assert( sizeof...(T) == 0, "T... must be empty" );
using type = mp_size_t<0>;
};
#else
template<template<class...> class L, template<class...> class P> struct mp_find_index_if_impl<L<>, P>
{
using type = mp_size_t<0>;
};
#endif
template<class L, template<class...> class P> struct mp_find_index_if_impl_2
{
using _r = typename mp_find_index_if_impl<L, P>::type;
using type = mp_size_t<1 + _r::value>;
};
template<template<class...> class L, class T1, class... T, template<class...> class P> struct mp_find_index_if_impl<L<T1, T...>, P>
{
using type = typename mp_if<P<T1>, mp_identity<mp_size_t<0>>, mp_find_index_if_impl_2<mp_list<T...>, P>>::type;
};
#endif
} // namespace detail
template<class L, template<class...> class P> using mp_find_index_if = typename detail::mp_find_index_if_impl<L, P>::type;
// mp_find<L, V>
// mp_find_if<L, P>