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Make mp_append SFINAE-friendly; add test/mp_append_sf.cpp

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This commit is contained in:
Peter Dimov
2019-01-07 07:03:05 +02:00
parent c61d99db87
commit 2bf0aa3815
4 changed files with 58 additions and 4 deletions
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27
include/boost/mp11/detail/mp_append.hpp
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@ -26,6 +26,10 @@ template<class... L> struct mp_append_impl;
#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, <= 1800 ) #if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, <= 1800 )
template<class... L> struct mp_append_impl
{
};
template<> struct mp_append_impl<> template<> struct mp_append_impl<>
{ {
using type = mp_list<>; using type = mp_list<>;
@ -36,14 +40,31 @@ template<template<class...> class L, class... T> struct mp_append_impl<L<T...>>
using type = L<T...>; using type = L<T...>;
}; };
template<template<class...> class L1, class... T1, template<class...> class L2, class... T2, class... Lr> struct mp_append_impl<L1<T1...>, L2<T2...>, Lr...> template<template<class...> class L1, class... T1, template<class...> class L2, class... T2> struct mp_append_impl<L1<T1...>, L2<T2...>>
{ {
using type = typename mp_append_impl<L1<T1..., T2...>, Lr...>::type; using type = L1<T1..., T2...>;
};
template<template<class...> class L1, class... T1, template<class...> class L2, class... T2, template<class...> class L3, class... T3> struct mp_append_impl<L1<T1...>, L2<T2...>, L3<T3...>>
{
using type = L1<T1..., T2..., T3...>;
};
template<template<class...> class L1, class... T1, template<class...> class L2, class... T2, template<class...> class L3, class... T3, template<class...> class L4, class... T4> struct mp_append_impl<L1<T1...>, L2<T2...>, L3<T3...>, L4<T4...>>
{
using type = L1<T1..., T2..., T3..., T4...>;
};
template<template<class...> class L1, class... T1, template<class...> class L2, class... T2, template<class...> class L3, class... T3, template<class...> class L4, class... T4, template<class...> class L5, class... T5, class... Lr> struct mp_append_impl<L1<T1...>, L2<T2...>, L3<T3...>, L4<T4...>, L5<T5...>, Lr...>
{
using type = typename mp_append_impl<L1<T1..., T2..., T3..., T4..., T5...>, Lr...>::type;
}; };
#else #else
template<class L1 = mp_list<>, class L2 = mp_list<>, class L3 = mp_list<>, class L4 = mp_list<>, class L5 = mp_list<>, class L6 = mp_list<>, class L7 = mp_list<>, class L8 = mp_list<>, class L9 = mp_list<>, class L10 = mp_list<>, class L11 = mp_list<>> struct append_11_impl; template<class L1 = mp_list<>, class L2 = mp_list<>, class L3 = mp_list<>, class L4 = mp_list<>, class L5 = mp_list<>, class L6 = mp_list<>, class L7 = mp_list<>, class L8 = mp_list<>, class L9 = mp_list<>, class L10 = mp_list<>, class L11 = mp_list<>> struct append_11_impl
{
};
template< template<
template<class...> class L1, class... T1, template<class...> class L1, class... T1,

1
test/Jamfile
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@ -26,6 +26,7 @@ run mp_push_back.cpp ;
run mp_rename.cpp ; run mp_rename.cpp ;
run mp_append.cpp ; run mp_append.cpp ;
run mp_append_2.cpp ; run mp_append_2.cpp ;
run mp_append_sf.cpp ;
run mp_replace_front.cpp ; run mp_replace_front.cpp ;
run mp_replace_second.cpp ; run mp_replace_second.cpp ;
run mp_replace_third.cpp ; run mp_replace_third.cpp ;

2
test/mp_append.cpp
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@ -1,5 +1,5 @@
// Copyright 2015 Peter Dimov. // Copyright 2015 Peter Dimov.
// //
// Distributed under the Boost Software License, Version 1.0. // Distributed under the Boost Software License, Version 1.0.
// //

32
test/mp_append_sf.cpp Normal file
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@ -0,0 +1,32 @@
// Copyright 2019 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/list.hpp>
#include <boost/mp11/utility.hpp>
#include <boost/core/lightweight_test_trait.hpp>
int main()
{
using boost::mp11::mp_append;
using boost::mp11::mp_valid;
using boost::mp11::mp_list;
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, void, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, void, void, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, mp_list<>, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, mp_list<>, mp_list<>, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, mp_list<>, mp_list<>, mp_list<>, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_append, mp_list<>, mp_list<>, mp_list<>, mp_list<>, void>));
return boost::report_errors();
}