std::experimental::source_location::function_name(3)

NAME
std::experimental::source_location::function_name - std::experimental::source_location::function_name

Synopsis
   constexpr const char* function_name() const noexcept; (library fundamentals TS v2)
   Returns the name of the function associated with the position represented by this
   object, if any.

Parameters
   (none)

Return value
   If this object represents a position in a body of a function, returns an
   implementation-defined null-terminated byte string corresponding to the name of the
   function.
   Otherwise, an empty string is returned.

Example
   The following example shows how it is possible to use the
   std::source_location::function_name() to print a name of a function, constructor,
   destructor, or overloaded operator(). // Run this code
 #include <experimental/source_location>
 #include <iostream>
 #include <string_view>
 inline void function_name(
     const std::string_view signature = "()",
     const std::experimental::source_location& location
         = std::experimental::source_location::current())
 {
     std::cout
         << location.function_name() // <- name of the caller!
         << signature
         << '\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(); }
 };
 int main()
 {
     foo();
     S p;
     S q{42};
     p = q;
     p = std::move(q);
 }

Possible output:
 foo()
 S()
 S(int)
 operator=(const S&)
 operator=(S&&)
 ~S()
 ~S()

See also
   line return the line number represented by this object
             (public member function)
   column return the column number represented by this object
             (public member function)
   file_name return the file name represented by this object
             (public member function)
   C++ documentation for
   Filename and line information