#include <cstdint>
#include <cstddef>
 
typedef uintmax_t FullInt;
 
template <size_t N>
struct UInt;
 
template <>
struct UInt<1> { typedef uint8_t type; };
 
template <>
struct UInt<2> { typedef uint16_t type; };
 
template <>
struct UInt<4> { typedef uint32_t type; };
 
typedef UInt<sizeof(FullInt)/2>::type HalfInt;
 
#include <typeinfo>
#include <iostream>
 
int main()
{
  std::cerr << sizeof(FullInt) << " " << sizeof(HalfInt) << std::endl;
}

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