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* [Bug c++/114812] New: Arguments of array type decay to pointer type too eagerly when used as arguments to ref- or ptr-to-function
@ 2024-04-22 19:53 rkraesig at mozilla dot com
2024-04-22 19:57 ` [Bug c++/114812] " pinskia at gcc dot gnu.org
2024-04-22 20:12 ` rkraesig at mozilla dot com
0 siblings, 2 replies; 3+ messages in thread
From: rkraesig at mozilla dot com @ 2024-04-22 19:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114812
Bug ID: 114812
Summary: Arguments of array type decay to pointer type too
eagerly when used as arguments to ref- or
ptr-to-function
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rkraesig at mozilla dot com
Target Milestone: ---
In a function-call expression, if the value F invoked as a function is of type
reference-to-function or pointer-to-function, a value of reference-to-array
type passed as an argument to F appears to be immediately converted to the
corresponding pointer type to which it would decay.
This prevents implicit converting constructors for the nominal argument types
of F which would convert from reference-to-array from being found.
This does not occur if F is of function type, nor if it is of some object type
with an `operator()`; in these cases the array type is passed without decay.
Example code (also at https://godbolt.org/z/jjKE31G7r):
struct S {
S(const int (&)[2]) {}
// S(const int *) {} // footnote [0]
};
static const int arr[] = {17, 42};
void func(S s) {}
void test() {
void (&f)(S) = func;
f(arr); // fails on GCC; succeeds on clang & MSVC
// func(arr); // succeeds everywhere
// (std::function{f})(arr); // succeeds everywhere
}
[0] If this alternate constructor is uncommented, the above code will compile
successfully under GCC... but will fail to compile on clang and MSVC, which
reject `f(arr);` as ambiguous.
Per testing on godbolt, this is not a recent regression, but appears to happen
on every version of GCC back to at least 4.1.2.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/114812] Arguments of array type decay to pointer type too eagerly when used as arguments to ref- or ptr-to-function
2024-04-22 19:53 [Bug c++/114812] New: Arguments of array type decay to pointer type too eagerly when used as arguments to ref- or ptr-to-function rkraesig at mozilla dot com
@ 2024-04-22 19:57 ` pinskia at gcc dot gnu.org
2024-04-22 20:12 ` rkraesig at mozilla dot com
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-22 19:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114812
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Maybe a dup of one of the bugs linked from PR 24666.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/114812] Arguments of array type decay to pointer type too eagerly when used as arguments to ref- or ptr-to-function
2024-04-22 19:53 [Bug c++/114812] New: Arguments of array type decay to pointer type too eagerly when used as arguments to ref- or ptr-to-function rkraesig at mozilla dot com
2024-04-22 19:57 ` [Bug c++/114812] " pinskia at gcc dot gnu.org
@ 2024-04-22 20:12 ` rkraesig at mozilla dot com
1 sibling, 0 replies; 3+ messages in thread
From: rkraesig at mozilla dot com @ 2024-04-22 20:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114812
--- Comment #2 from Raymond Kraesig <rkraesig at mozilla dot com> ---
(In reply to Andrew Pinski from comment #1)
> Maybe a dup of one of the bugs linked from PR 24666.
It's none of the open bugs, as far as I can tell. Since it still happens on
trunk, I assume it's none of the closed bugs, either... although bug 41426 is
suspiciously similar.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-04-22 19:53 [Bug c++/114812] New: Arguments of array type decay to pointer type too eagerly when used as arguments to ref- or ptr-to-function rkraesig at mozilla dot com
2024-04-22 19:57 ` [Bug c++/114812] " pinskia at gcc dot gnu.org
2024-04-22 20:12 ` rkraesig at mozilla dot com
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