dtor hook

//
// Hooking & wrapping of virtual class methods in C++ (gcc/clang/intel ABI only)
//
// (C) 2016 by Bueddl <sebastian.buettner@powerserverplus.net>
//

#include "hook.hpp"
#include <iostream>

class SomeClass
{
public:
    virtual ~SomeClass() = default;

    virtual int test_fn(int param)
    {
        std::cout << "Original SomeClass::test_fn()" << std::endl
                            << "  this = " << this << std::endl
                            << "  param = " << param << std::endl
                            << "  -> " << (param * 7) << std::endl;

        return param * 7;
    }
};

void some_class_dtor(SomeClass const *_this)
{
    // Get some stuff done before
    std::cout << "Pre call to SomeClass::~SomeClass()" << std::endl
                        << "  this = " << _this << std::endl;

    // Get and call orig
    Hook<SomeClass>::call_once<1>(_this);

    // Get some stuff done after
    std::cout << "Post call to SomeClass::~SomeClass()" << std::endl;
}

int main()
{
    // Create object instance
    SomeClass *some_object = new SomeClass;

    // Hook
    Hook<SomeClass>::install<1>(some_object, some_class_dtor);

    // Delete object instance
    delete some_object;

    return 0;
}