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Implement the first part of N4258 - allocator_traits<X>::is_always_equal. Also fixes PR#23723

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@238848 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2015-06-02 16:34:03 +00:00
parent 8731c5da46
commit f0324bcaa1
4 changed files with 91 additions and 1 deletions
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48
test/std/utilities/memory/allocator.traits/allocator.traits.types/is_always_equal.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.
//
//===----------------------------------------------------------------------===//
// <memory>
// template <class Alloc>
// struct allocator_traits
// {
// typedef Alloc::is_always_equal
// | is_empty is_always_equal;
// ...
// };
#include <memory>
#include <type_traits>
template <class T>
struct A
{
typedef T value_type;
typedef std::true_type is_always_equal;
};
template <class T>
struct B
{
typedef T value_type;
};
template <class T>
struct C
{
typedef T value_type;
int not_empty_; // some random member variable
};
int main()
{
static_assert((std::is_same<std::allocator_traits<A<char> >::is_always_equal, std::true_type>::value), "");
static_assert((std::is_same<std::allocator_traits<B<char> >::is_always_equal, std::true_type>::value), "");
static_assert((std::is_same<std::allocator_traits<C<char> >::is_always_equal, std::false_type>::value), "");
}