| Issue |
109793
|
| Summary |
Unnecessary warning for the fixed range-based for loop in C++23
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
josuttis
|
Consider (for the complete example, see: https://www.godbolt.org/z/oajGrd56M):
```
std::vector<std::string> getData() { return {"OK?", "other", "ok"}; }
for (auto c : getData()[0]) {
std::cout << c << '\n';
}
```
Iterating over a reference to an rvalue was an error before C++23, but since C++23 it no longer is.
Thanks for making the approporiate fix in clang. However, there is still a warning as if we don't have the fix.
```
<source>:13:17: warning: object backing the pointer will be destroyed at the end of the full-_expression_ [-Wdangling-gsl]
13 | for (auto c : getData()[0]) {
| ^~~~~~~~~
1 warning generated.
ASM generation compiler returned: 0
<source>:13:17: warning: object backing the pointer will be destroyed at the end of the full-_expression_ [-Wdangling-gsl]
13 | for (auto c : getData()[0]) {
| ^~~~~~~~~
```
So, this warning should go away with C++23. Not sure how easy it is to fix it, though, as this is a special behavior just in the range-based for loop.
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