Attempting to implement python-style decorators in C++. Not sure I like it write now.

c++-decorators.cpp

#include <iostream>
#include <functional>
#include <unordered_map>
#include <string>
using std::placeholders::_1;
#define DCLASS(name) \
    typedef std::function<void(name&)> atomic_t; \
    std::unordered_map<std::string, atomic_t> m_atomics;


#define ATOMIC(name, cls, fn, fields, ...) \
    void setup(cls& dclass) { \
        fields \
        dclass.m_atomics[name] = std::bind(&fn, _1, __VA_ARGS__); \
    }

class Foo {
public:
    DCLASS(Foo)
    void Fizz(int a, int b);
};

ATOMIC("fizz", Foo, Foo::Fizz, int a = 2; int b = 3;, a, b)
void Foo::Fizz(int a, int b) {
    std::cout << a << " " << b;
    // do stuff
}


int main()
{
    Foo k = Foo();
    setup(k);
    k.m_atomics["fizz"](k);
}