Is there a way to get function name inside a C++ function?

Question

I want to implement a function tracer, which would trace how much time a function is taking to execute. I have following class for the same:-

class FuncTrace         


        

Answer 1

C++20 std::source_location::function_name

This does basically exactly what you want.

https://en.cppreference.com/w/cpp/utility/source_location claims usage will be like:

#include 
#include 
#include 

void log(std::string_view message,
         const std::source_location& location std::source_location::current()
) {
    std::cout << "info:"
              << location.file_name() << ":"
              << location.line() << ":"
              << location.function_name() << " "
              << message << '\n';
}

int main() {
    log("Hello world!");
}

Possible output:

info:main.cpp:16:main Hello world!

so note how the call preserves caller information.

I have covered the relevant standards in a bit more detail at: What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?