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448995c521
promise_type Address the post-commit comment in https://reviews.llvm.org/D125517#inline-1217244
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
// RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify
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#include "Inputs/std-coroutine.h"
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namespace std {
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typedef decltype(sizeof(int)) size_t;
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}
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struct Allocator {};
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struct resumable {
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struct promise_type {
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void *operator new(std::size_t sz, Allocator &);
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resumable get_return_object() { return {}; }
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auto initial_suspend() { return std::suspend_always(); }
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auto final_suspend() noexcept { return std::suspend_always(); }
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void unhandled_exception() {}
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void return_void(){};
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};
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};
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resumable f1() { // expected-error {{'operator new' provided by 'std::coroutine_traits<resumable>::promise_type' (aka 'resumable::promise_type') is not usable with the function signature of 'f1'}}
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co_return;
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}
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// NOTE: Although the argument here is a rvalue reference and the corresponding
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// allocation function in resumable::promise_type have lvalue references, it looks
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// the signature of f2 is invalid. But according to [dcl.fct.def.coroutine]p4:
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//
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// In the following, pi is an lvalue of type Pi, where p1 denotes the object
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// parameter and pi+1 denotes the ith non-object function parameter for a
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// non-static member function.
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//
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// And [dcl.fct.def.coroutine]p9.1
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//
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// overload resolution is performed on a function call created by assembling an argument list.
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// The first argument is the amount of space requested, and has type std::size_t.
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// The lvalues p1…pn are the succeeding arguments.
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//
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// So the actual type passed to resumable::promise_type::operator new is lvalue
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// Allocator. It is allowed to convert a lvalue to a lvalue reference. So the
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// following one is valid.
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resumable f2(Allocator &&) {
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co_return;
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}
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resumable f3(Allocator &) {
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co_return;
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}
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resumable f4(Allocator) {
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co_return;
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}
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resumable f5(const Allocator) { // expected-error {{operator new' provided by 'std::coroutine_traits<resumable, const Allocator>::promise_type' (aka 'resumable::promise_type') is not usable}}
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co_return;
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}
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resumable f6(const Allocator &) { // expected-error {{operator new' provided by 'std::coroutine_traits<resumable, const Allocator &>::promise_type' (aka 'resumable::promise_type') is not usable}}
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co_return;
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}
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struct promise_base1 {
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void *operator new(std::size_t sz); // expected-note {{member found by ambiguous name lookup}}
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};
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struct promise_base2 {
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void *operator new(std::size_t sz); // expected-note {{member found by ambiguous name lookup}}
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};
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struct resumable2 {
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struct promise_type : public promise_base1, public promise_base2 {
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resumable2 get_return_object() { return {}; }
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auto initial_suspend() { return std::suspend_always(); }
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auto final_suspend() noexcept { return std::suspend_always(); }
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void unhandled_exception() {}
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void return_void(){};
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};
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};
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resumable2 f7() { // expected-error {{member 'operator new' found in multiple base classes of different types}}
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co_return;
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}
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