types_test.cpp

#include <cstdint>
#include <iostream>
#include <type_traits>

template <typename> const std::string tName{"???"};
template <> const std::string tName<char>{"char"};
template <> const std::string tName<signed char>{"signed char"};
template <> const std::string tName<unsigned char>{"unsigned char"};
template <> const std::string tName<short>{"short"};
template <> const std::string tName<unsigned short>{"unsigned short"};
template <> const std::string tName<int>{"int"};
template <> const std::string tName<unsigned int>{"unsigned int"};
template <> const std::string tName<long>{"long"};
template <> const std::string tName<unsigned long>{"unsigned long"};
template <> const std::string tName<long long>{"long long"};
template <> const std::string tName<unsigned long long>{"unsigned long long"};

int main() {
#define PR(t) std::cout << #t " is " << tName<t> << std::endl;
    PR(int8_t);
    PR(uint8_t);
    PR(int16_t);
    PR(int32_t);
    PR(int64_t);
    PR(size_t);
    PR(ptrdiff_t);
    PR(intptr_t);
    PR(uintptr_t);
    return 0;
}

OSX: make CXXFLAGS=-std=c++17 types_test ; ./types_test

int8_t is signed char
uint8_t is unsigned char
int16_t is short
int32_t is int
int64_t is long long
size_t is unsigned long
ptrdiff_t is long
intptr_t is long
uintptr_t is unsigned long