demangle typeid name

demangle.cpp

#include <cxxabi.h>
#include <typeinfo>
#include <memory>
#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;

struct FreeDeleter {
    void operator()(char* ptr) {
        free(ptr);
    }
};

string demangle(char const* name) {
    int status;
    unique_ptr<char, FreeDeleter> demangled_name(__cxxabiv1::__cxa_demangle(name, nullptr, nullptr, &status));
    switch (status) {
    case 0:
        return string(demangled_name.get());
    case -1:
        return "A memory allocation failure occurred.";
    case -2:
        return "name is not a valid name under the C++ ABI mangling rules.";
    case -3:
        return "One of the arguments is invalid.";
    default:
        return "Unknown error.";
    }
}

int main() {
    cout << demangle(typeid("hello").name()) << endl;
    cout << demangle(typeid(FreeDeleter).name()) << endl;
    return 0;
}

free() してないので後でなおす

直した。たぶん。