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问题描述

我有点明白什么 memset的定义()是。不过,我不明白它的点是。

I understand slightly what the definition of memset() is. However, I don't understand what the point of it is for.

定义:设置内存ptr指向指定值块的第一NUM个字节(除preTED为unsigned char)

Definition: Sets the first num bytes of the block of memory pointed by ptr to the specified value (interpreted as an unsigned char).

那么,这很难code值在内存地址?

So does this hard code a value in a memory address?

memset的(安培; serv_addr,0,sizeof的(serv_addr)是我想了解的例子

有人可以在一个非常简单的方式解释一下吗?

Can someone please explain in a VERY simplified way?

推荐答案

memset的()是一个相对简单的操作非常快的版本:

memset() is a very fast version of a relatively simple operation:

void* memset(void* b, int c, size_t len) {
    char* p = (char*)b;
    for (size_t i = 0; i != len; ++i) {
        p[i] = c;
    }
    return b;
}

这就是 memset的(B,C,L)设置→起始地址字节 b 的值 C 。它只是它比上面的实现快得多。

That is, memset(b, c, l) set the l bytes starting at address b to the value c. It just does it much faster than in the above implementation.

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10-29 09:54