Templated C++ function to get the demangled name of a type with const, volatile, and references.

type_name.cpp

#include <cxxabi.h>

#include <typeinfo>
#include <type_traits>
#include <string>
#include <memory>
#include <cstdlib>

template<typename T>
std::string type_name() {
    std::unique_ptr<char, decltype(&std::free)> demangled(
        abi::__cxa_demangle(typeid(T).name(), nullptr, nullptr, nullptr),
        std::free
    );

    std::string name = demangled ? demangled.get() : typeid(T).name();

    if (std::is_const<T>::value) name += " const";
    if (std::is_volatile<T>::value) name += " volatile";

    if      (std::is_lvalue_reference<T>::value) name += "&";
    else if (std::is_rvalue_reference<T>::value) name += "&&";

    return name;
}