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Add mp_drop.

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This commit is contained in:
Peter Dimov
2015-06-22 02:42:37 +03:00
parent cf49d00e45
commit 8bf6feb206
3 changed files with 107 additions and 1 deletions
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22
include/boost/mp11/algorithm.hpp
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@@ -10,6 +10,7 @@
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.hpp>
#include <boost/mp11/utility.hpp>
#include <boost/mp11/detail/mp_plus.hpp>
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
@@ -199,7 +200,6 @@ template<class L, std::size_t N> using mp_repeat_c = typename detail::mp_repeat_
template<class L, class N> using mp_repeat = typename detail::mp_repeat_impl<L, N>::type;
// mp_product<F, L...>
namespace detail
{
@@ -227,6 +227,26 @@ template<template<class...> class F, class L1, class... L> struct mp_product_imp
template<template<class...> class F, class... L> using mp_product = typename detail::mp_product_impl<F, L...>::type;
// mp_drop(_c)<L, N>
namespace detail
{
template<class L, class L2> struct mp_drop_impl;
template<template<class...> class L, class... T, template<class...> class L2, class... U> struct mp_drop_impl<L<T...>, L2<U...>>
{
template<class... W> static mp_identity<L<W...>> f( U*..., mp_identity<W>*... );
using R = decltype( f( (mp_identity<T>*)0 ... ) );
using type = typename R::type;
};
} // namespace detail
template<class L, std::size_t N> using mp_drop_c = typename detail::mp_drop_impl<L, mp_repeat_c<mp_list<void>, N>>::type;
template<class L, class N> using mp_drop = typename detail::mp_drop_impl<L, mp_repeat<mp_list<void>, N>>::type;
// mp_take(_c)<L, N>
// mp_at(_c)<L, I>
// mp_find<L, V>