| Issue |
169712
|
| Summary |
clang 18.1 c++ front-end regression: not recognizing enum members of a template structure
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
blu
|
The following code last compiled successfully in clang 17.0.1 (last version tried) and stopped compiling in clang 18.1.0 (first version noticed to fail) when using `-std=c++11 -Wall -Wno-unused -Werror`:
```
#include <istream>
#include <limits>
template < typename T >
struct A {
enum { dimension = 2 };
};
A<int> a;
int arr[A<int>::dimension]; // OK
int brr[a.dimension]; // OK
template < typename SCALAR_T >
inline std::istream&
operator >>(
std::istream& str,
A< SCALAR_T >& v)
{
float temp[v.dimension]; // not OK?
for (size_t i = 0; i < v.dimension; ++i)
temp[i] = std::numeric_limits< float >::quiet_NaN();
return str;
}
void foo(std::istream &str)
{
A<float> a;
str >> a;
}
```
godbolt.org: https://godbolt.org/z/7c9xE6KEE
clang diagnostics message: `function parameter 'v' with unknown value cannot be used in a constant _expression_`
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