https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119918
Bug ID: 119918
Summary: formattable<std::thread::id, T> returns true for types
other than char and wchar_t
Product: gcc
Version: 14.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: tkaminsk at gcc dot gnu.org
Target Milestone: ---
We do not constrain the _CharT accepted by the formatter<thread::id, _CharT>,
and as consequence formattable<std::thread:id, Any> is true for Any type:
```
static_assert(std::formattable<std::thread::id, int>);
static_assert(std::formattable<std::thread::id, char16_t>);
```
// https://godbolt.org/z/858W9vfdT
The standard also does not limit acceptable charT, however it does not
supporting formatting of pointers/integer (underlying type of native handle)
for types other than char and wchar_t.
