| Issue |
64777
|
| Summary |
[C++20] [constexpr] virtual member function template specialisation compilation error
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
pkeir
|
The C++20 code below fails to compile with Clang trunk (GCC and MSVC compile fine). Removing either both `constexpr` qualifiers; or the `virtual` specifier will remove the error.
```cpp
template <typename T>
struct Foo
{
constexpr
virtual
void m() { }
};
template<>
constexpr
void Foo<int*>::m() { }
```
The invocation and error message are below:
```
$ clang++ -std=c++20 -c test.cpp
test.cpp:15:17: error: explicit specialization of 'm' after instantiation
void Foo<int*>::m() { }
^
test.cpp:15:6: note: implicit instantiation first required here
void Foo<int*>::m() { }
^
1 error generated.
```
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