我编写了以下程序,该程序可与 msvc c++17 配合使用,但被 gcc 和 clang 拒绝。我想知道这里是哪个编译器。 演示
#include <variant>
struct C
{
std::variant<bool> mem;
C(std::variant<bool> p): mem(p)
{
}
};
int main()
{
C c(1); //works with msvc but not with gcc and clang
}
海湾合作委员会说:
<source>: In function 'int main()':
<source>:13:10: error: no matching function for call to 'C::C(int)'
13 | C c(1); //works with msvc but not with gcc and clang
| ^
<source>:6:5: note: candidate: 'C::C(std::variant<bool>)'
6 | C(std::variant<bool> p): mem(p)
| ^
<source>:6:26: note: no known conversion for argument 1 from 'int' to 'std::variant<bool>'
6 | C(std::variant<bool> p): mem(p)
| ~~~~~~~~~~~~~~~~~~~^
<source>:3:8: note: candidate: 'constexpr C::C(const C&)'
3 | struct C
| ^
<source>:3:8: note: no known conversion for argument 1 from 'int' to 'const C&'
<source>:3:8: note: candidate: 'constexpr C::C(C&&)'
<source>:3:8: note: no known conversion for argument 1 from 'int' to 'C&&'
<source>:13:7: warning: unused variable 'c' [-Wunused-variable]
13 | C c(1); //works with msvc but not with gcc and clang
我想知道这里是哪个编译器
GCC 和 clang 就在这里。这是 P0608R3 和一个已确认的 msvc bug,应作为 C++17 的 DR 应用。
这是相应的已确认的 msvc bug 报告:
std::variant b(1)