| Issue |
120197
|
| Summary |
Cannot compare std::string's in if constexpr
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Fedr
|
This program
```c++
#include <string>
struct A {
static constexpr std::string name() { return "a"; }
};
template<class T>
bool f( T && ) {
if constexpr ( T::name() == "a" )
return true;
else
return false;
}
int main() {
return f( A{} );
}
```
is accepted by GCC and MSVC, but Clang complains:
```
error: constexpr if condition is not a constant _expression_
9 | if constexpr ( T::name() == "a" )
| ^~~~~~~~~~~~~~~~
```
Online demo: https://gcc.godbolt.org/z/o3nMx3zWj
Original discussion: https://stackoverflow.com/q/79283228/7325599
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