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std::ptrdiff_t

STD：：ptrdiff[医]T型

Defined in header ​​
typedef /*implementation-defined*/ ptrdiff_t;​​

std::ptrdiff_t减除两个指针的结果的有符号整数类型。

注记

std::ptrdiff_t用于指针算法和数组索引，如果可能出现负值。使用其他类型的程序，例如int，例如，当索引超过64位时，系统可能会发生故障。INT_MAX或者它是否依赖于32位模块运算。

在使用C++容器库时，迭代器之间的区别的适当类型是difference_type，这通常是与std::ptrdiff_t...

只有指向相同数组%28的元素(包括指针)的指针(在数组结束后的指针)(%5月29日)相互减除。

如果数组如此大，%28大于PTRDIFF_MAX元素，但小于SIZE_MAX字节%29，即两个指针之间的差异可能不能表示为std::ptrdiff_t，减去两个这样的指针的结果是未知的。

对于短于PTRDIFF_MAX，，，std::ptrdiff_t作为签署的对应方std::size_t*它可以存储任意类型数组的大小，并且在大多数平台上都是std::intptr_t...

例

二次

#include <cstddef>
#include <iostream>
int main()
{
    const std::size_t N = 100;
    int* a = new int[N];
    int* end = a + N;
    for (std::ptrdiff_t i = N; i > 0; --i)
        std::cout << (*(end - i) = i) << ' ';
    delete[] a;
}

二次

另见

size_tunsigned integer type returned by the sizeof operator (typedef)
offsetofbyte offset from the beginning of a standard-layout type to specified member (function macro)

c ptrdiff文档[医]T型

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