std::source_location::function_name - cppreference.com (original) (raw)

| constexpr const char* function_name() const noexcept; | | (since C++20) | | ------------------------------------------------------- | | ------------- |

Returns the name of the function associated with the position represented by this object, if any.

[edit] Parameters

(none)

[edit] 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.

[edit] Example

std::source_location::function_name may help to obtain the names of functions (including the special functions) alongside with their signatures.

#include #include #include   inline void print_function_name( const std::source_location& location = std::source_location::current()) { std::puts(location.function_name()); // prints the name of the caller }   void foo(double &&) { print_function_name(); }   namespace bar { void baz() { print_function_name(); } }   template auto pub(T) { print_function_name(); return 42; }   struct S { S() { print_function_name(); } S(int) { print_function_name(); } ~S() { print_function_name(); } S& operator=(S const&) { print_function_name(); return *this; } S& operator=(S&&) { print_function_name(); return this; } };   int main(int, char const const[]) { print_function_name(); foo(3.14); bar::baz(); pub(0xFULL); S p; S q{42}; p = q; p = std::move(q); [] { print_function_name(); }(); }

Possible output:

int main(int, const char* const*) void foo(double&&) void bar::baz() auto pub(T) [with T = long long unsigned int] S::S() S::S(int) S& S::operator=(const S&) S& S::operator=(S&&) main(int, const char* const*)::<lambda()> S::S() S::S()

[edit] See also

| | return the line number represented by this object (public member function) [edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | return the column number represented by this object (public member function) [edit] | | | return the file name represented by this object (public member function) [edit] |