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Add value list support to mp_take. Refs #53.

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This commit is contained in:
Peter Dimov
2023-05-16 19:46:38 +03:00
parent ac65812efd
commit c1a012ad45
3 changed files with 91 additions and 2 deletions
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4
include/boost/mp11/algorithm.hpp
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@ -470,8 +470,8 @@ struct mp_take_c_impl<N, L<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T...>, typen
} // namespace detail
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;
template<class L, std::size_t N> using mp_take_c = mp_assign<L, typename detail::mp_take_c_impl<N, mp_rename<L, mp_list>>::type>;
template<class L, class N> using mp_take = mp_take_c<L, std::size_t{ N::value }>;
// mp_back<L>
template<class L> using mp_back = mp_at_c<L, mp_size<L>::value - 1>;

1
test/Jamfile
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@ -97,6 +97,7 @@ run mp_at.cpp ;
run mp_at_2.cpp ;
run mp_at_sf.cpp : : : <toolset>gcc-4.7:<warnings>all ;
run mp_take.cpp ;
run mp_take_2.cpp ;
run mp_replace.cpp ;
run mp_replace_if.cpp ;
run mp_replace_if_q.cpp ;

88
test/mp_take_2.cpp Normal file
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@ -0,0 +1,88 @@
// Copyright 2023 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.hpp>
#if !defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
#pragma message("Test skipped because BOOST_MP11_HAS_TEMPLATE_AUTO is not defined")
int main() {}
#else
#include <boost/core/lightweight_test_trait.hpp>
template<auto... A> struct V1 {};
template<int... I> struct V2 {};
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_take;
using boost::mp11::mp_take_c;
using boost::mp11::mp_size_t;
{
using L1 = V1<>;
BOOST_TEST_TRAIT_SAME(mp_take_c<L1, 0>, L1);
BOOST_TEST_TRAIT_SAME(mp_take<L1, mp_size_t<0>>, L1);
using L2 = V1<false, 0, true, 1, std::size_t(2)>;
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 0>, V1<>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 1>, V1<false>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 2>, V1<false, 0>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 3>, V1<false, 0, true>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 4>, V1<false, 0, true, 1>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 5>, V1<false, 0, true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<0>>, V1<>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<1>>, V1<false>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<2>>, V1<false, 0>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<3>>, V1<false, 0, true>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<4>>, V1<false, 0, true, 1>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<5>>, V1<false, 0, true, 1, std::size_t(2)>);
}
{
using L1 = V2<>;
BOOST_TEST_TRAIT_SAME(mp_take_c<L1, 0>, L1);
BOOST_TEST_TRAIT_SAME(mp_take<L1, mp_size_t<0>>, L1);
using L2 = V2<1, 2, 3, 4, 5>;
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 0>, V2<>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 1>, V2<1>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 2>, V2<1, 2>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 3>, V2<1, 2, 3>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 4>, V2<1, 2, 3, 4>);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 5>, V2<1, 2, 3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<0>>, V2<>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<1>>, V2<1>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<2>>, V2<1, 2>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<3>>, V2<1, 2, 3>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<4>>, V2<1, 2, 3, 4>);
BOOST_TEST_TRAIT_SAME(mp_take<L2, mp_size_t<5>>, V2<1, 2, 3, 4, 5>);
}
using boost::mp11::mp_iota_c;
using boost::mp11::mp_rename_v;
{
using L1 = mp_rename_v<mp_iota_c<71>, V1>;
using L2 = mp_rename_v<mp_iota_c<72>, V1>;
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 72>, L2);
BOOST_TEST_TRAIT_SAME(mp_take_c<L2, 71>, L1);
}
return boost::report_errors();
}
#endif