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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>

1
test/Jamfile.v2
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@@ -34,6 +34,7 @@ run mp_count_if.cpp : : : $(REQ) ;
run mp_contains.cpp : : : $(REQ) ;
run mp_repeat.cpp : : : $(REQ) ;
run mp_product.cpp : : : $(REQ) ;
run mp_drop.cpp : : : $(REQ) ;
# integral
run integral.cpp : : : $(REQ) ;

85
test/mp_drop.cpp Normal file
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@@ -0,0 +1,85 @@
// Copyright 2015 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <tuple>
#include <utility>
struct X1 {};
struct X2 {};
struct X3 {};
struct X4 {};
struct X5 {};
int main()
{
using boost::mp_list;
using boost::mp_drop;
using boost::mp_drop_c;
using boost::mp_size_t;
{
using L1 = mp_list<>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
using L2 = mp_list<X1, X2, X3, X4, X5>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 0>, mp_list<X1, X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 1>, mp_list<X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 2>, mp_list<X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 3>, mp_list<X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 4>, mp_list<X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 5>, mp_list<>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<0>>, mp_list<X1, X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<1>>, mp_list<X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<2>>, mp_list<X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<3>>, mp_list<X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<4>>, mp_list<X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<5>>, mp_list<>>));
}
{
using L1 = std::tuple<>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
using L2 = std::tuple<X1, X2, X3, X4, X5>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 0>, std::tuple<X1, X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 1>, std::tuple<X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 2>, std::tuple<X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 3>, std::tuple<X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 4>, std::tuple<X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 5>, std::tuple<>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<0>>, std::tuple<X1, X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<1>>, std::tuple<X2, X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<2>>, std::tuple<X3, X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<3>>, std::tuple<X4, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<4>>, std::tuple<X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<5>>, std::tuple<>>));
}
{
using L1 = std::pair<X1, X2>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
}
return boost::report_errors();
}