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Add mp_back, mp_pop_back

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This commit is contained in:
Peter Dimov
2019-02-16 19:41:08 +02:00
parent 6a880ae572
commit dda257c403
4 changed files with 109 additions and 0 deletions
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6
include/boost/mp11/algorithm.hpp
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@ -443,6 +443,12 @@ struct mp_take_c_impl<N, L<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T...>, typen
template<class L, std::size_t N> using mp_take_c = typename detail::mp_take_c_impl<N, L>::type;
template<class L, class N> using mp_take = typename detail::mp_take_c_impl<std::size_t{ N::value }, L>::type;
// mp_back<L>
template<class L> using mp_back = mp_at_c<L, mp_size<L>::value - 1>;
// mp_pop_back<L>
template<class L> using mp_pop_back = mp_take_c<L, mp_size<L>::value - 1>;
// mp_replace<L, V, W>
namespace detail
{

2
test/Jamfile
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@ -104,6 +104,8 @@ run mp_max_element.cpp ;
run mp_max_element_q.cpp ;
run mp_nth_element.cpp ;
run mp_nth_element_q.cpp ;
run mp_back.cpp ;
run mp_pop_back.cpp ;
# integral
run integral.cpp ;

52
test/mp_back.cpp Normal file
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@ -0,0 +1,52 @@
// Copyright 2015, 2019 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/core/lightweight_test_trait.hpp>
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/utility.hpp>
#include <type_traits>
#include <tuple>
#include <utility>
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_back;
using L1 = mp_list<void>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_back<L1>, void>));
using L2 = mp_list<float, void, int[]>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_back<L2>, int[]>));
using L3 = std::tuple<int>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_back<L3>, int>));
using L4 = std::pair<char, double>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_back<L4>, double>));
using L5 = std::add_const<void()>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_back<L5>, void()>));
using boost::mp11::mp_iota_c;
using boost::mp11::mp_size_t;
int const N = 137;
using L6 = mp_iota_c<N>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_back<L6>, mp_size_t<N-1>>));
using boost::mp11::mp_valid;
using L7 = mp_list<>;
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_back, L7>));
return boost::report_errors();
}

49
test/mp_pop_back.cpp Normal file
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@ -0,0 +1,49 @@
// Copyright 2015, 2019 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/core/lightweight_test_trait.hpp>
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/utility.hpp>
#include <type_traits>
#include <tuple>
#include <utility>
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_pop_back;
using L1 = mp_list<void>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_pop_back<L1>, mp_list<>>));
using L2 = mp_list<float, void, int[]>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_pop_back<L2>, mp_list<float, void>>));
using L3 = std::tuple<int>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_pop_back<L3>, std::tuple<>>));
using L4 = std::tuple<char, double>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_pop_back<L4>, std::tuple<char>>));
using boost::mp11::mp_iota_c;
using boost::mp11::mp_size_t;
int const N = 137;
using L6 = mp_iota_c<N>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_pop_back<L6>, mp_iota_c<N-1>>));
using boost::mp11::mp_valid;
using L7 = mp_list<>;
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_pop_back, L7>));
return boost::report_errors();
}