#include <iostream>
#include <string_view>
#include <source_location>
 
inline void function_name(
    const std::string_view signature = "()",
    const std::source_location& location = std::source_location::current())
{
    std::cout << location.function_name(); // <- 调用方之名！
    if (!signature.empty())
        std::cout << signature;
    std::cout << '\n';
}
 
void foo() { function_name(); }
 
struct S {
    S() { function_name(); }
    S(int) { function_name("(int)"); }
    S& operator=(S const&) { function_name("(const S&)"); return *this; }
    S& operator=(S&&) { function_name("(S&&)"); return *this; }
    ~S() { function_name(); }
};
 
auto main() -> int
{
    foo();
    S p;
    S q{42};
    p = q;
    p = std::move(q);
}