[C++] Helper function to get the demangled name of a type as a string (for gcc)

demangleTemplateType.hpp

#pragma once

#include <string>
#include <cxxabi.h>

template<typename T>
std::string demangleTemplateType() {
    const auto typeName = typeid(T).name();
    const auto demangledName = abi::__cxa_demangle(typeName, nullptr, nullptr, nullptr);
    const auto name = demangledName ? demangledName : typeName;
    std::string string{name};
    free(demangledName); // required by the __cxa_demangle()'s documentation
    return string;
}

main.cpp

#include <iostream>
using std::cout;

int main() {
     std::cout << demangleTemplateType<int>() << '\n';
     std::cout << demangleTemplateType<float>() << '\n';
     std::cout << demangleTemplateType<std::string>() << '\n';
     std::cout << demangleTemplateType<unsigned char>() << '\n';
}

ouput.txt

int
float
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
unsigned char