C++ keyword: long

#include <climits>
#include <concepts>
#include <iostream>
#include <limits>
#include <locale>
 
static_assert(
 sizeof(long) >= 32 / CHAR_BIT &&
 sizeof(unsigned long) >= 32 / CHAR_BIT &&
 std::numeric_limits <long>::min() <= -2'147'483'647l - 1 && //'
 std::numeric_limits <long>::max() >= 2'147'483'647l && //'
 std::numeric_limits <unsigned long>::max() >= 4'294'967'295ul); //'
 
// 'long long' and 'unsigned long long' are available since C++11
static_assert(
 sizeof(long long) >= 64 / CHAR_BIT &&
 sizeof(unsigned long long) >= 64 / CHAR_BIT &&
 std::numeric_limits <long long>::min() <= -9'223'372'036'854'775'807ll - 1 &&
 std::numeric_limits <long long>::max() >= 9'223'372'036'854'775'807ll &&
 std::numeric_limits <unsigned long long>::max() >= 18'446'744'073'709'551'615ull);
 
// concepts are available since C++20
static_assert(
 std::integral <long> &&
 std::integral <long long> &&
 std::integral <unsigned long> &&
 std::integral <unsigned long long> &&
 std::floating_point <long double>);
// Note that 'long' cannot modify 'float'
 
static_assert(
 std::same_as <decltype(0l), signed long int> &&
 std::same_as <decltype(0ll), signed long long int> &&
 std::same_as <decltype(0ul), unsigned long int> &&
 std::same_as <decltype(0ull), unsigned long long int> &&
 std::same_as <decltype(0.l), long double>);
 
template <typename T, typename... Ts>
concept all_same = (... and std::same_as <T, Ts>);
 
static_assert(
 all_same<long, long int, signed long, signed long int> &&
 all_same<unsigned long, unsigned long int> &&
 all_same<long long, long long int, signed long long, signed long long int> &&
 all_same<unsigned long long, unsigned long long int>);
 
#define OUT(...) std::cout << #__VA_ARGS__ << " = " << __VA_ARGS__ << '\n'
 
int main()
{
 std::cout.imbue(std::locale ("en_US.UTF-8"));
 
 OUT(sizeof(long));
 OUT(std::numeric_limits <long>::min());
 OUT(std::numeric_limits <long>::max());
 OUT(std::numeric_limits <unsigned long>::max());
 
 OUT(sizeof(long long));
 OUT(std::numeric_limits <long long>::min());
 OUT(std::numeric_limits <long long>::max());
 OUT(std::numeric_limits <unsigned long long>::max());
}
 
#undef OUT

sizeof(long) = 8
std::numeric_limits<long>::min() = -9,223,372,036,854,775,808
std::numeric_limits<long>::max() = 9,223,372,036,854,775,807
std::numeric_limits<unsigned long>::max() = 18,446,744,073,709,551,615
sizeof(long long) = 8
std::numeric_limits<long long>::min() = -9,223,372,036,854,775,808
std::numeric_limits<long long>::max() = 9,223,372,036,854,775,807
std::numeric_limits<unsigned long long>::max() = 18,446,744,073,709,551,615