1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify
#include "Inputs/std-coroutine.h"
namespace std {
typedef decltype(sizeof(int)) size_t;
}
struct Allocator {};
struct resumable {
struct promise_type {
void *operator new(std::size_t sz, Allocator &);
resumable get_return_object() { return {}; }
auto initial_suspend() { return std::suspend_always(); }
auto final_suspend() noexcept { return std::suspend_always(); }
void unhandled_exception() {}
void return_void(){};
};
};
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'}}
co_return;
}
// NOTE: Although the argument here is a rvalue reference and the corresponding
// allocation function in resumable::promise_type have lvalue references, it looks
// the signature of f2 is invalid. But according to [dcl.fct.def.coroutine]p4:
//
// In the following, pi is an lvalue of type Pi, where p1 denotes the object
// parameter and pi+1 denotes the ith non-object function parameter for a
// non-static member function.
//
// And [dcl.fct.def.coroutine]p9.1
//
// overload resolution is performed on a function call created by assembling an argument list.
// The first argument is the amount of space requested, and has type std::size_t.
// The lvalues p1…pn are the succeeding arguments.
//
// So the actual type passed to resumable::promise_type::operator new is lvalue
// Allocator. It is allowed to convert a lvalue to a lvalue reference. So the
// following one is valid.
resumable f2(Allocator &&) {
co_return;
}
resumable f3(Allocator &) {
co_return;
}
resumable f4(Allocator) {
co_return;
}
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}}
co_return;
}
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}}
co_return;
}
struct promise_base1 {
void *operator new(std::size_t sz); // expected-note {{member found by ambiguous name lookup}}
};
struct promise_base2 {
void *operator new(std::size_t sz); // expected-note {{member found by ambiguous name lookup}}
};
struct resumable2 {
struct promise_type : public promise_base1, public promise_base2 {
resumable2 get_return_object() { return {}; }
auto initial_suspend() { return std::suspend_always(); }
auto final_suspend() noexcept { return std::suspend_always(); }
void unhandled_exception() {}
void return_void(){};
};
};
resumable2 f7() { // expected-error {{member 'operator new' found in multiple base classes of different types}}
co_return;
}
|
