compile_time_type_resolution.cpp

/*
	Compile-time resolution of correct data type based on the platform differency. For example, if the code is compiled in a 32-bit machine,
	integral_ptr_t is resolved into uint32_t. Reinterpreting the pointer, which is a void pointer, into uint32_t and dereferencing later back to, e.g. int*,
	is a thorough valid operation. -> Refer to https://en.cppreference.com/w/cpp/language/reinterpret_cast for further information.
  
  Reference: https://en.wikibooks.org/wiki/C%2B%2B_Programming/Templates/Template_Meta-Programming
*/

#include <iostream>
#include <cstdint>

template <bool Condition,typename TrueResult, typename FalseResult>
class if_;

template <typename TrueResult,typename FalseResult>
struct if_<true,TrueResult,FalseResult>
{
	typedef TrueResult result;
};

template<typename TrueResult,typename FalseResult>
struct if_<false,TrueResult,FalseResult>
{
	typedef FalseResult result;
};

int main(){
  typename if_<true,int,void*>::result number(3);
	typename if_<false,int,void*>::result pointer(&number);

	typedef typename if_<(sizeof(void *) > sizeof(uint32_t)),uint64_t,uint32_t>::result integral_ptr_t;
	integral_ptr_t converted_pointer = reinterpret_cast<integral_ptr_t>(pointer);
	std::cout<<*((int *)converted_pointer)<<std::endl;
}