https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111145
Bug ID: 111145
Summary: istream::operator>>(streambuf*) does not set gcount
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: admin at computerquip dot com
Target Milestone: ---
Example code: https://godbolt.org/z/cW9Pe1c85
```
#include <sstream>
#include <iostream>
int main()
{
std::ostringstream oss;
std::istringstream iss("test");
iss >> oss.rdbuf();
std::cout << "gcount is " << iss.gcount() << "\n";
}
```
Here I'm expecting `iss.gcount()` to return 4 as `iss >> oss.rdbuf();`, as far
as I can tell, fits under the conditions that should set the value accessed by
gcount().
As per the godbolt link, it instead returns 0.
