C++标准模板（STL）- 类型支持 （定宽整数类型）（int8_t,int_fast8_t,int_least8_t,intmax_t,intptr_t）

定宽整数类型

类型

调用示例

#include <iostream>
#include <cstdint>
 
int main()
{
    //分别为宽度恰为 8、16、32 和 64 位的有符号整数类型,无填充位并对负值使用补码
    std::cout << "sizeof(int8_t):           " << sizeof(int8_t) << std::endl;
    std::cout << "sizeof(int16_t):          " << sizeof(int16_t) << std::endl;
    std::cout << "sizeof(int32_t):          " << sizeof(int32_t) << std::endl;
    std::cout << "sizeof(int64_t):          " << sizeof(int64_t) << std::endl;
    std::cout << std::endl;
 
    //分别为宽度至少有 8、16、32 和 64 位的最快的有符号整数类型
    std::cout << "sizeof(int_fast8_t):      " << sizeof(int_fast8_t) << std::endl;
    std::cout << "sizeof(int_fast16_t):     " << sizeof(int_fast16_t) << std::endl;
    std::cout << "sizeof(int_fast32_t):     " << sizeof(int_fast32_t) << std::endl;
    std::cout << "sizeof(int_fast64_t):     " << sizeof(int_fast64_t) << std::endl;
    std::cout << std::endl;
 
    //分别为宽度至少有 8、16、32 和 64 位的最小的有符号整数类型
    std::cout << "sizeof(int_least8_t):     " << sizeof(int_least8_t) << std::endl;
    std::cout << "sizeof(int_least16_t):    " << sizeof(int_least16_t) << std::endl;
    std::cout << "sizeof(int_least32_t):    " << sizeof(int_least32_t) << std::endl;
    std::cout << "sizeof(int_least32_t):    " << sizeof(int_least64_t) << std::endl;
    std::cout << std::endl;
 
    //宽度恰为 8、16、32 和 64 位的无符号整数类型
    std::cout << "sizeof(uint8_t):          " << sizeof(uint8_t) << std::endl;
    std::cout << "sizeof(uint16_t):         " << sizeof(uint16_t) << std::endl;
    std::cout << "sizeof(uint32_t):         " << sizeof(uint32_t) << std::endl;
    std::cout << "sizeof(uint64_t):         " << sizeof(uint64_t) << std::endl;
    std::cout << std::endl;
 
    //分别为宽度至少有 8、16、32 和 64 位的最快无符号整数类型
    std::cout << "sizeof(uint_fast8_t):     " << sizeof(uint_fast8_t) << std::endl;
    std::cout << "sizeof(uint_fast16_t):    " << sizeof(uint_fast16_t) << std::endl;
    std::cout << "sizeof(uint_fast32_t):    " << sizeof(uint_fast32_t) << std::endl;
    std::cout << "sizeof(uint_fast64_t):    " << sizeof(uint_fast64_t) << std::endl;
    std::cout << std::endl;
 
    //分别为宽度至少有 8、16、32 和 64 位的最小无符号整数类型
    std::cout << "sizeof(uint_least8_t):    " << sizeof(uint_least8_t) << std::endl;
    std::cout << "sizeof(uint_least16_t):   " << sizeof(uint_least16_t) << std::endl;
    std::cout << "sizeof(uint_least32_t):   " << sizeof(uint_least32_t) << std::endl;
    std::cout << "sizeof(uint_least32_t):   " << sizeof(uint_least64_t) << std::endl;
    std::cout << std::endl;
 
    //最大宽度的有符号整数类型
    std::cout << "sizeof(intmax_t):         " << sizeof(intmax_t) << std::endl;
    //足以保有指针的有符号整数类型
    std::cout << "sizeof(intptr_t):         " << sizeof(intptr_t) << std::endl;
    std::cout << "sizeof(uintmax_t):        " << sizeof(uintmax_t) << std::endl;
    std::cout << "sizeof(uintptr_t):        " << sizeof(uintptr_t) << std::endl;
    std::cout << std::endl;
    return 0;
}

输出