#include <iostream>
#include <iomanip>
#include <string>
#include <cstring>

#define LOG(index, cv, ncv) std::cout \
        << std::dec << index << ".- Address = " \
        << std::hex << &cv << "\tValue = " << cv << '\n' \
        << std::dec << index << ".- Address = " \
        << std::hex << &ncv << "\tValue = " << ncv << '\n'

// Try with no-const reference
void change_with_no_const_ref(const unsigned int &const_value)
{
    unsigned int &no_const_ref = const_cast<unsigned int &>(const_value);
    no_const_ref = 0xfabada;
    LOG(1, const_value, no_const_ref);    
}

// Try with no-const pointer
void change_with_no_const_ptr(const unsigned int &const_value)
{
    unsigned int *no_const_ptr = const_cast<unsigned int *>(&const_value);
    *no_const_ptr = 0xb0bada;
    LOG(2, const_value, (*no_const_ptr));
}

// Try with c-style cast
void change_with_cstyle_cast(const unsigned int &const_value)
{
    unsigned int *no_const_ptr = (unsigned int *)&const_value;
    *no_const_ptr = 0xdeda1;
    LOG(3, const_value, (*no_const_ptr));
}

// Try with memcpy
void change_with_memcpy(const unsigned int &const_value)
{
    unsigned int *no_const_ptr = const_cast<unsigned int *>(&const_value);
    unsigned int brute_force = 0xba51c;
    std::memcpy(no_const_ptr, &brute_force, sizeof(const_value));
    LOG(4, const_value, (*no_const_ptr));
}

void change_with_union(const unsigned int &const_value)
{
    // Try with union
    union bad_idea
    {
        const unsigned int *const_ptr;
        unsigned int *no_const_ptr;
    } u;

    u.const_ptr = &const_value;
    *u.no_const_ptr = 0xbeb1da;
    LOG(5, const_value, (*u.no_const_ptr));
}

int main(int argc, char **argv)
{
    unsigned int value = 0xcafe01e;
    change_with_no_const_ref(value);
    change_with_no_const_ptr(value);
    change_with_cstyle_cast(value);
    change_with_memcpy(value);
    change_with_union(value);

    return 0;
}