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Add mp_rename_v. Refs #53.

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This commit is contained in:
Peter Dimov
2023-05-14 22:03:39 +03:00
parent ac1b5c96ea
commit 5186e7c294
3 changed files with 85 additions and 1 deletions
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29
include/boost/mp11/list.hpp
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@@ -1,7 +1,7 @@
#ifndef BOOST_MP11_LIST_HPP_INCLUDED
#define BOOST_MP11_LIST_HPP_INCLUDED
// Copyright 2015-2017 Peter Dimov.
// Copyright 2015-2023 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
@@ -190,6 +190,33 @@ template<class L, class... T> using mp_push_back = typename detail::mp_push_back
// mp_apply_q<Q, L>
// in detail/mp_rename.hpp
// mp_rename_v<L, B>
#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
namespace detail
{
template<class L, template<auto...> class B> struct mp_rename_v_impl
{
// An error "no type named 'type'" here means that the first argument to mp_rename_v is not a list
};
template<template<class...> class L, class... T, template<auto...> class B> struct mp_rename_v_impl<L<T...>, B>
{
using type = B<T::value...>;
};
template<template<auto...> class L, auto... A, template<auto...> class B> struct mp_rename_v_impl<L<A...>, B>
{
using type = B<A...>;
};
} // namespace detail
template<class L, template<auto...> class B> using mp_rename_v = typename detail::mp_rename_v_impl<L, B>::type;
#endif
// mp_replace_front<L, T>
namespace detail
{

1
test/Jamfile
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@@ -51,6 +51,7 @@ run mp_transform_front.cpp ;
run mp_transform_second.cpp ;
run mp_transform_third.cpp ;
run mp_list_v.cpp ;
run mp_rename_v.cpp ;
# algorithm
run mp_assign.cpp ;

56
test/mp_rename_v.cpp Normal file
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@@ -0,0 +1,56 @@
// 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_list_v;
using boost::mp11::mp_rename_v;
using boost::mp11::mp_list_c;
using boost::mp11::mp_rename;
using boost::mp11::mp_list;
BOOST_TEST_TRAIT_SAME(mp_rename_v<L1<>, mp_list_v>, mp_list_v<>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L1<false>, mp_list_v>, mp_list_v<false>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L1<0>, mp_list_v>, mp_list_v<0>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L1<std::size_t(0)>, mp_list_v>, mp_list_v<std::size_t(0)>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L1<false, 0, std::size_t(0)>, mp_list_v>, mp_list_v<false, 0, std::size_t(0)>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L2<>, mp_list_v>, mp_list_v<>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L2<0>, mp_list_v>, mp_list_v<0>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L2<0, 1>, mp_list_v>, mp_list_v<0, 1>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<L2<0, 1, 2>, mp_list_v>, mp_list_v<0, 1, 2>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_v<>, L2>, L2<>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_v<0>, L2>, L2<0>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_v<0, 1>, L2>, L2<0, 1>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_v<0, 1, 2>, L2>, L2<0, 1, 2>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_c<int>, L2>, L2<>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_c<int, 0>, L2>, L2<0>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_c<int, 0, 1>, L2>, L2<0, 1>);
BOOST_TEST_TRAIT_SAME(mp_rename_v<mp_list_c<int, 0, 1, 2>, L2>, L2<0, 1, 2>);
using L3 = mp_rename<L1<false, 0, std::size_t(0)>, mp_list>;
BOOST_TEST_TRAIT_SAME(mp_rename_v<L3, mp_list_v>, mp_list_v<false, 0, std::size_t(0)>);
return boost::report_errors();
}
#endif