| Issue |
174211
|
| Summary |
Clang accepts invalid program containing conversion operator with brace initialization
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
ranaanoop
|
The following invalid program is accepted by clang but rejected by both gcc and msvc: [Dem](https://godbolt.org/z/G4Pfdnbno)
```
template<typename T>
struct B {
consteval B(T t) : m_t{ t } { };
template<typename U>
operator B<U>() const { return B<U>(static_cast<U>(m_t), typename B<U>::private_ctor_tag{}); }
operator T() const { return m_t; }
private:
struct private_ctor_tag{};
B(T t, private_ctor_tag) : m_t{ t } { };
template<typename U>
friend struct B;
T m_t;
};
struct A {
B<double> b;
};
int main() {
constexpr B<int> my_b{ 42 };
// okay on all compilers
A a0{ .b = my_b };
// okay only with clang. msvc and gcc give errors.
A a1{ .b{ my_b } };
A a2{ .b = { my_b } };
return 0;
}
```
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