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

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This commit is contained in:
Peter Dimov
2023-05-14 21:22:16 +03:00
parent 570acee866
commit 7944028c7a
3 changed files with 48 additions and 0 deletions
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9
include/boost/mp11/list.hpp
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@@ -42,6 +42,15 @@ template<template<class...> class L, class... T> struct mp_size_impl<L<T...>>
using type = mp_size_t<sizeof...(T)>;
};
#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
template<template<auto...> class L, auto... A> struct mp_size_impl<L<A...>>
{
using type = mp_size_t<sizeof...(A)>;
};
#endif
} // namespace detail
template<class L> using mp_size = typename detail::mp_size_impl<L>::type;

1
test/Jamfile
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@@ -26,6 +26,7 @@ compile mp11.cpp ;
# list
run mp_size.cpp ;
run mp_size_2.cpp ;
run mp_empty.cpp ;
run mp_front.cpp ;
run mp_pop_front.cpp ;

38
test/mp_size_2.cpp Normal file
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@@ -0,0 +1,38 @@
// 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... A> struct L2 {};
int main()
{
using boost::mp11::mp_size;
using boost::mp11::mp_size_t;
BOOST_TEST_TRAIT_SAME(mp_size<L1<>>, mp_size_t<0>);
BOOST_TEST_TRAIT_SAME(mp_size<L1<false>>, mp_size_t<1>);
BOOST_TEST_TRAIT_SAME(mp_size<L1<false, 0>>, mp_size_t<2>);
BOOST_TEST_TRAIT_SAME(mp_size<L1<false, 0, std::size_t(0)>>, mp_size_t<3>);
BOOST_TEST_TRAIT_SAME(mp_size<L2<>>, mp_size_t<0>);
BOOST_TEST_TRAIT_SAME(mp_size<L2<0>>, mp_size_t<1>);
BOOST_TEST_TRAIT_SAME(mp_size<L2<0, 1>>, mp_size_t<2>);
BOOST_TEST_TRAIT_SAME(mp_size<L2<0, 1, 2>>, mp_size_t<3>);
return boost::report_errors();
}
#endif