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std::size_t

STD：大小[医]T型

Defined in header ​​
Defined in header <cstdio>​​
Defined in header <cstdlib>​​
Defined in header <cstring>​​
Defined in header <ctime>​​
Defined in header <cwchar>​​
typedef /*implementation-defined*/ size_t;​​

std::size_t的结果的无符号整数类型。sizeof运算符以及sizeof...运算符和alignof运算符%28自C++11%29。

注记

std::size_t可以存储任何类型%28(包括数组%29)的理论上可能的对象的最大大小。大小不能由std::size_t自C++14%29在许多平台上运行以来，是否存在格式错误的%28？一个例外是具有分段寻址%29的系统。std::size_t可以安全地存储任何非成员指针的值，在这种情况下，它是std::uintptr_t...

std::size_t通常用于数组索引和循环计数。使用其他类型的程序，例如unsigned int，因为数组索引可能会失败，例如，当索引超过64位系统时。UINT_MAX或者它是否依赖于32位模块运算。

当索引C++容器时，例如std::string，，，std::vector，等，适当的类型是成员类型size_type由该等货柜提供。它通常被定义为std::size_t...

例

二次

#include <cstddef>
#include <iostream>
 
int main()
{
    const std::size_t N = 10;
    int* a = new int[N];
 
    for (std::size_t n = 0; n < N; ++n)
        a[n] = n;
    for (std::size_t n = N; n-- > 0;) // Reverse cycles are tricky for unsigned types.
        std::cout << a[n] << " ";
 
    delete[] a;
}

二次

产出：

二次

9 8 7 6 5 4 3 2 1 0

二次

另见

ptrdiff_tsigned integer type returned when subtracting two pointers (typedef)
offsetofbyte offset from the beginning of a standard-layout type to specified member (function macro)

c尺寸文件[医]T型

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http：//en.cppreference.com/w/cpp/type/size[医]T型

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