How to print member function address in C++

Question

It looks like std::cout can\'t print member function\'s address, for example:

#include 

using std::cout;
using std::endl;

clas         


        

Answer 1

Pointers to member functions need memory, too. They also have a size. So how about printing out the memory of the pointer:

template
std::string to_string(R (T::*func)(Args...))
{
    union PtrUnion
    {
        R(T::*f)(Args...);
        std::array buf;
    };
    PtrUnion u;
    u.f = func;

    std::ostringstream os;

    os << std::hex << std::setfill('0');
    for (auto c : u.buf)
        os << std::setw(2) << (unsigned)c;

    return os.str();
}

You can use it this way:

class TestClass
{
    void foo();
};

...

std::cout << to_string(&TestClass::foo) << std::endl;