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std::memset

STD：：Memset

Defined in header ​​
void* memset( void* dest, int ch, std::size_t count ​​

转换值ch到unsigned char并将其复制到第一个count指向的对象的字符dest如果对象不是微不足道的-复制%28e。g.、标量、数组或与C兼容的结构%29，行为未定义.。如果count值所指向的对象的大小。dest，该行为是未定义的。

参数

dest-pointer to the object to fill
ch-fill byte
count-number of bytes to fill

返回值

dest...

注记

std::memset在如-规则%29，如果该函数修改的对象在其生命周期的剩余时间内未再次被访问，则为%28例如。gcc bug 853729%。因此，此函数不能用于清除内存%28例如。若要填充存储密码的数组，请使用0%29。解决方案包括C11memset_s、FreeBSD显式[医]b零或者微软SecureZeroMemory...

例

二次

#include <iostream>
#include <cstring>
 
int main()
{
    int a[20];
    std::memset(a, 0, sizeof a
    for (int ai : a) std::cout << ai;
}

二次

产出：

二次

00000000000000000000

二次

另见

memcpycopies one buffer to another (function)
memmovemoves one buffer to another (function)
wmemsetcopies the given wide character to every position in a wide character array (function)
fillcopy-assigns the given value to every element in a range (function template)
fill_ncopy-assigns the given value to N elements in a range (function template)
is_trivially_copyable (C++11)checks if a type is trivially copyable (class template)

C.memset的文档

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