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Add support for value lists to mp_push_back. Refs #53.

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This commit is contained in:
Peter Dimov
2023-05-15 17:30:09 +03:00
parent 7cfb1b9b97
commit 8615aed8e8
3 changed files with 56 additions and 0 deletions
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9
include/boost/mp11/list.hpp
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@@ -239,6 +239,15 @@ template<template<class...> class L, class... U, class... T> struct mp_push_back
using type = L<U..., T...>;
};
#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
template<template<auto...> class L, auto... A, class... T> struct mp_push_back_impl<L<A...>, T...>
{
using type = L<A..., T::value...>;
};
#endif
} // namespace detail
template<class L, class... T> using mp_push_back = typename detail::mp_push_back_impl<L, T...>::type;

1
test/Jamfile
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@@ -44,6 +44,7 @@ run mp_third_2.cpp ;
run mp_push_front.cpp ;
run mp_push_front_2.cpp ;
run mp_push_back.cpp ;
run mp_push_back_2.cpp ;
run mp_rename.cpp ;
run mp_rename_2.cpp ;
run mp_append.cpp ;

46
test/mp_push_back_2.cpp Normal file
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@@ -0,0 +1,46 @@
// Copyright 2023 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/list.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/mp11/integral.hpp>
#include <boost/core/lightweight_test_trait.hpp>
template<auto... A> struct L1 {};
template<int... I> struct L2 {};
int main()
{
using boost::mp11::mp_push_back;
using boost::mp11::mp_true;
using boost::mp11::mp_false;
using boost::mp11::mp_int;
BOOST_TEST_TRAIT_SAME(mp_push_back<L1<>>, L1<>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L1<>, mp_false>, L1<false>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L1<>, mp_false, mp_true>, L1<false, true>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L1<-1, -2>>, L1<-1, -2>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L1<-1, -2>, mp_false>, L1<-1, -2, false>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L1<-1, -2>, mp_false, mp_true>, L1<-1, -2, false, true>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L2<>>, L2<>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L2<>, mp_int<0>>, L2<0>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L2<>, mp_int<0>, mp_int<1>>, L2<0, 1>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L2<-1, -2>>, L2<-1, -2>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L2<-1, -2>, mp_int<0>>, L2<-1, -2, 0>);
BOOST_TEST_TRAIT_SAME(mp_push_back<L2<-1, -2>, mp_int<0>, mp_int<1>>, L2<-1, -2, 0, 1>);
return boost::report_errors();
}
#endif