Utility function for demangling C++ type names with RTTI

demangle_type_name.cc

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

std::string demangleTypeName(const char *name) {
    int status;
    char *realname;
    std::string ret;

    realname = abi::__cxa_demangle(name, 0, 0, &status);
    if (status != 0)
        return std::string(name);

    ret = realname;
    free(realname);
    return ret;
}

#define type_name(expr)   demangleTypeName(typeid(expr).name())

#include <iostream>

int main(void)
{
    std::string::const_iterator foo;
    std::cout << "Mangled:   " << typeid(foo).name() << std::endl;
    std::cout << "Demangled: " << type_name(foo) << std::endl;
}