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0b56830011
Summary: Addressing https://bugs.llvm.org/show_bug.cgi?id=37265. Implements [class.copy]/33 of coroutines TS. When the criteria for elision of a copy/move operation are met, but not for an exception-declaration, and the object to be copied is designated by an lvalue, or when the expression in a return or co_return statement is a (possibly parenthesized) id-expression that names an object with automatic storage duration declared in the body or parameter-declaration-clause of the innermost enclosing function or lambda-expression, overload resolution to select the constructor for the copy or the return_value overload to call is first performed as if the object were designated by an rvalue. Patch by Tanoy Sinha! Reviewers: modocache, GorNishanov Reviewed By: modocache, GorNishanov Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D51741 llvm-svn: 343949
70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -stdlib=libc++ -std=c++1z -fcoroutines-ts -fsyntax-only
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namespace std::experimental {
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template <class Promise = void> struct coroutine_handle {
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coroutine_handle() = default;
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static coroutine_handle from_address(void *) noexcept;
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};
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template <> struct coroutine_handle<void> {
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static coroutine_handle from_address(void *) noexcept;
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coroutine_handle() = default;
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template <class PromiseType>
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coroutine_handle(coroutine_handle<PromiseType>) noexcept;
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};
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template <class... Args>
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struct void_t_imp {
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using type = void;
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};
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template <class... Args>
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using void_t = typename void_t_imp<Args...>::type;
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template <class T, class = void>
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struct traits_sfinae_base {};
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template <class T>
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struct traits_sfinae_base<T, void_t<typename T::promise_type>> {
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using promise_type = typename T::promise_type;
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};
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template <class Ret, class... Args>
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struct coroutine_traits : public traits_sfinae_base<Ret> {};
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}
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struct suspend_never {
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bool await_ready() noexcept;
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void await_suspend(std::experimental::coroutine_handle<>) noexcept;
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void await_resume() noexcept;
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};
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struct MoveOnly {
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MoveOnly() {};
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MoveOnly(const MoveOnly&) = delete;
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MoveOnly(MoveOnly&&) noexcept {};
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~MoveOnly() {};
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};
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template <typename T>
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struct task {
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struct promise_type {
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auto initial_suspend() { return suspend_never{}; }
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auto final_suspend() { return suspend_never{}; }
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auto get_return_object() { return task{}; }
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static void unhandled_exception() {}
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void return_value(T&& value) {}
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};
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};
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task<MoveOnly> f() {
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MoveOnly value;
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co_return value;
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}
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int main() {
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f();
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return 0;
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}
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// expected-no-diagnostics
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