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Add an __is_inplace_index metafunction.

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Summary: This is used to constrain `variant`'s converting constructor correctly.

Reviewers: EricWF, mclow.lists

Reviewed By: EricWF, mclow.lists

Differential Revision: https://reviews.llvm.org/D34111

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@305370 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Park
2017-06-14 05:51:18 +00:00
parent 0175dfdfdf
commit c590dae5d6
3 changed files with 70 additions and 0 deletions
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32
test/libcxx/utilities/utility/__is_inplace_index.pass.cpp Normal file
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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// template <class _Tp> using __is_inplace_index
#include <utility>
struct S {};
int main() {
using I = std::in_place_index_t<0>;
static_assert( std::__is_inplace_index<I>::value, "");
static_assert( std::__is_inplace_index<const I>::value, "");
static_assert( std::__is_inplace_index<const volatile I>::value, "");
static_assert( std::__is_inplace_index<I&>::value, "");
static_assert( std::__is_inplace_index<const I&>::value, "");
static_assert( std::__is_inplace_index<const volatile I&>::value, "");
static_assert( std::__is_inplace_index<I&&>::value, "");
static_assert( std::__is_inplace_index<const I&&>::value, "");
static_assert( std::__is_inplace_index<const volatile I&&>::value, "");
static_assert(!std::__is_inplace_index<std::in_place_type_t<int>>::value, "");
static_assert(!std::__is_inplace_index<std::in_place_t>::value, "");
static_assert(!std::__is_inplace_index<void>::value, "");
static_assert(!std::__is_inplace_index<int>::value, "");
static_assert(!std::__is_inplace_index<S>::value, "");
}

32
test/libcxx/utilities/utility/__is_inplace_type.pass.cpp Normal file
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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// template <class _Tp> using __is_inplace_type
#include <utility>
struct S {};
int main() {
using T = std::in_place_type_t<int>;
static_assert( std::__is_inplace_type<T>::value, "");
static_assert( std::__is_inplace_type<const T>::value, "");
static_assert( std::__is_inplace_type<const volatile T>::value, "");
static_assert( std::__is_inplace_type<T&>::value, "");
static_assert( std::__is_inplace_type<const T&>::value, "");
static_assert( std::__is_inplace_type<const volatile T&>::value, "");
static_assert( std::__is_inplace_type<T&&>::value, "");
static_assert( std::__is_inplace_type<const T&&>::value, "");
static_assert( std::__is_inplace_type<const volatile T&&>::value, "");
static_assert(!std::__is_inplace_type<std::in_place_index_t<0>>::value, "");
static_assert(!std::__is_inplace_type<std::in_place_t>::value, "");
static_assert(!std::__is_inplace_type<void>::value, "");
static_assert(!std::__is_inplace_type<int>::value, "");
static_assert(!std::__is_inplace_type<S>::value, "");
}