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Add mp_same.

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This commit is contained in:
Peter Dimov
2017-04-01 20:01:51 +03:00
parent c34e1520e5
commit 28c420edf7
3 changed files with 55 additions and 0 deletions
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21
include/boost/mp11/function.hpp
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@@ -12,6 +12,7 @@
#include <boost/mp11/utility.hpp>
#include <boost/mp11/detail/mp_list.hpp>
#include <boost/mp11/detail/mp_count.hpp>
#include <type_traits>
namespace boost
{
@@ -84,6 +85,26 @@ template<class T1, class... T> struct mp_or_impl<T1, T...>
} // namespace detail
// mp_same<T...>
namespace detail
{
template<class... T> struct mp_same_impl;
template<> struct mp_same_impl<>
{
using type = mp_true;
};
template<class T1, class... T> struct mp_same_impl<T1, T...>
{
using type = mp_all<std::is_same<T1, T>...>;
};
} // namespace detail
template<class... T> using mp_same = typename detail::mp_same_impl<T...>::type;
} // namespace mp11
} // namespace boost

1
test/Jamfile.v2
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@@ -94,6 +94,7 @@ run mp_all.cpp : : : $(REQ) ;
run mp_and.cpp : : : $(REQ) ;
run mp_any.cpp : : : $(REQ) ;
run mp_or.cpp : : : $(REQ) ;
run mp_same.cpp : : : $(REQ) ;
# map
run mp_map_find.cpp : : : $(REQ) ;

33
test/mp_same.cpp Normal file
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@@ -0,0 +1,33 @@
// Copyright 2017 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/function.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
int main()
{
using boost::mp11::mp_same;
using boost::mp11::mp_true;
using boost::mp11::mp_false;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<>, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void>, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void>, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void, void>, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void, void, void>, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void, void, void, void>, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, int>, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void, int>, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void, void, int>, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_same<void, void, void, void, int>, mp_false>));
return boost::report_errors();
}