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Make mp_rename, mp_apply, mp_apply_q SFINAE-friendly

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This commit is contained in:
Peter Dimov
2023-03-24 11:58:56 +02:00
parent 077b258c33
commit 094206a08d
3 changed files with 53 additions and 2 deletions
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5
include/boost/mp11/detail/mp_rename.hpp
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@@ -8,6 +8,8 @@
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/detail/mp_defer.hpp>
namespace boost
{
namespace mp11
@@ -22,9 +24,8 @@ template<class A, template<class...> class B> struct mp_rename_impl
// An error "no type named 'type'" here means that the first argument to mp_rename is not a list
};
template<template<class...> class A, class... T, template<class...> class B> struct mp_rename_impl<A<T...>, B>
template<template<class...> class A, class... T, template<class...> class B> struct mp_rename_impl<A<T...>, B>: mp_defer<B, T...>
{
using type = B<T...>;
};
} // namespace detail

1
test/Jamfile
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@@ -41,6 +41,7 @@ run mp_replace_front.cpp ;
run mp_replace_second.cpp ;
run mp_replace_third.cpp ;
run mp_apply_q.cpp ;
run mp_apply_q_sf.cpp ;
run mp_is_list.cpp ;
run mp_list_c.cpp ;
run mp_transform_front.cpp ;

49
test/mp_apply_q_sf.cpp Normal file
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@@ -0,0 +1,49 @@
// Copyright 2015, 2017, 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>
#include <boost/mp11/utility.hpp>
#include <boost/mp11/detail/config.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
using boost::mp11::mp_apply_q;
using boost::mp11::mp_list;
using boost::mp11::mp_quote;
using boost::mp11::mp_quote_trait;
using boost::mp11::mp_valid;
using boost::mp11::mp_identity;
using boost::mp11::mp_identity_t;
int main()
{
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, void>));
#if !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1920 )
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, void, mp_list<>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, void, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, void, mp_list<void, void>>));
#endif
using Qi = mp_quote<mp_identity_t>;
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, Qi, mp_list<>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_apply_q, Qi, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, Qi, mp_list<void, void>>));
using Qt = mp_quote_trait<mp_identity>;
#if !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1900 )
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, Qt, mp_list<>>));
#endif
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_apply_q, Qt, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_apply_q, Qt, mp_list<void, void>>));
return boost::report_errors();
}