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* [Bug c++/68891] must use a typedef to declare a conversion to 'double (&)[3]'
[not found] <bug-68891-4@http.gcc.gnu.org/bugzilla/>
@ 2021-11-04 8:24 ` mathieu.malaterre at gmail dot com
2021-11-04 9:44 ` redi at gcc dot gnu.org
2024-01-08 16:23 ` mital at mitalashok dot co.uk
2 siblings, 0 replies; 3+ messages in thread
From: mathieu.malaterre at gmail dot com @ 2021-11-04 8:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68891
--- Comment #1 from Mathieu Malaterre <mathieu.malaterre at gmail dot com> ---
Here is the output from clang++:
error: cannot specify any part of a return type in the declaration of a
conversion function; use a typedef to declare a conversion to 'double (&)[3]'
% clang++ --version
Debian clang version 11.0.1-2
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/68891] must use a typedef to declare a conversion to 'double (&)[3]'
[not found] <bug-68891-4@http.gcc.gnu.org/bugzilla/>
2021-11-04 8:24 ` [Bug c++/68891] must use a typedef to declare a conversion to 'double (&)[3]' mathieu.malaterre at gmail dot com
@ 2021-11-04 9:44 ` redi at gcc dot gnu.org
2024-01-08 16:23 ` mital at mitalashok dot co.uk
2 siblings, 0 replies; 3+ messages in thread
From: redi at gcc dot gnu.org @ 2021-11-04 9:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68891
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2021-11-04
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
struct V
{
(&operator double ())[3] {
return v;
}
double v[3];
};
static void Print( const double (&)[3] )
{
}
int main()
{
V v = {0,1,2};
Print( v );
}
EDG accepts it too. MSVC says:
error C2586: incorrect user-defined conversion syntax: illegal indirections
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/68891] must use a typedef to declare a conversion to 'double (&)[3]'
[not found] <bug-68891-4@http.gcc.gnu.org/bugzilla/>
2021-11-04 8:24 ` [Bug c++/68891] must use a typedef to declare a conversion to 'double (&)[3]' mathieu.malaterre at gmail dot com
2021-11-04 9:44 ` redi at gcc dot gnu.org
@ 2024-01-08 16:23 ` mital at mitalashok dot co.uk
2 siblings, 0 replies; 3+ messages in thread
From: mital at mitalashok dot co.uk @ 2024-01-08 16:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68891
Mital Ashok <mital at mitalashok dot co.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mital at mitalashok dot co.uk
--- Comment #3 from Mital Ashok <mital at mitalashok dot co.uk> ---
This is also erroneously named with `operator double`:
assert(V{0,1,2}.operator double()[1] == 1.0);
using T = double;
assert(V{0,1,2}.operator T()[1] == 1.0);
using U = double(&)[3];
// 'struct V' has no member named 'operator U'
// V{0,1,2}.operator U();
And a similar thing happens with user defined conversions to function pointers
/ references
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <bug-68891-4@http.gcc.gnu.org/bugzilla/>
2021-11-04 8:24 ` [Bug c++/68891] must use a typedef to declare a conversion to 'double (&)[3]' mathieu.malaterre at gmail dot com
2021-11-04 9:44 ` redi at gcc dot gnu.org
2024-01-08 16:23 ` mital at mitalashok dot co.uk
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