031a3d203a
Summary: This patch marks *most* tests for `std::promise`, `std::future` and `std::shared_future` as unsupported in C++03. These tests fail in C++03 mode because they attempt to copy a `std::future` even though it is a `MoveOnly` type. AFAIK the missing move-semantics in `std::future` is the only reason these tests fail but without move semantics these classes are useless. For example even though `std::promise::set_value` and `std::promise::set_exception(...)` work in C++03 `std::promise` is still useless because we cannot call `std::promise::get_future(...)`. It might be possible to hack `std::move(...)` like we do for `std::unique_ptr` to make the move semantics work but I don't think it is worth the effort. Instead I think we should leave the `<future>` header as-is and mark the failing tests as `UNSUPPORTED`. I don't believe there are any users of `std::future` or `std::promise` in C++03 because they are so unusable. Therefore I am not concerned about losing test coverage and possibly breaking users. However because there are still parts of `<future>` that work in C++03 it would be wrong to `#ifdef` out the entire header. @mclow.lists Should we take further steps to prevent the use of `std::promise`, `std::future` and `std::shared_future` in C++03? Note: This patch also cleans up the tests and converts them to use `support/test_allocator.h` instead of a duplicate class in `test/std/futures/test_allocator.h`. Reviewers: mclow.lists Subscribers: vsk, mclow.lists, cfe-commits Differential Revision: http://reviews.llvm.org/D12135 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@246271 91177308-0d34-0410-b5e6-96231b3b80d8
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <future>
|
|
|
|
// class future<R>
|
|
|
|
// future& operator=(const future&) = delete;
|
|
|
|
#include <future>
|
|
|
|
#include "test_macros.h"
|
|
|
|
int main()
|
|
{
|
|
#if TEST_STD_VER >= 11
|
|
{
|
|
std::future<int> f0, f;
|
|
f = f0; // expected-error {{overload resolution selected deleted operator '='}}
|
|
}
|
|
{
|
|
std::future<int &> f0, f;
|
|
f = f0; // expected-error {{overload resolution selected deleted operator '='}}
|
|
}
|
|
{
|
|
std::future<void> f0, f;
|
|
f = f0; // expected-error {{overload resolution selected deleted operator '='}}
|
|
}
|
|
#else
|
|
{
|
|
std::future<int> f0, f;
|
|
f = f0; // expected-error {{'operator=' is a private member of 'std::__1::future<int>'}}
|
|
}
|
|
{
|
|
std::future<int &> f0, f;
|
|
f = f0; // expected-error {{'operator=' is a private member of 'std::__1::future<int &>'}}
|
|
}
|
|
{
|
|
std::future<void> f0, f;
|
|
f = f0; // expected-error {{'operator=' is a private member of 'std::__1::future<void>'}}
|
|
}
|
|
#endif
|
|
}
|