std::memchr
STD：：memchr
| Defined in header | | |
|---|---|---|
| const void* memchr( const void* ptr, int ch, std::size_t count | | |
| void* memchr( void* ptr, int ch, std::size_t count | | |
皈依ch到unsigned char，并在初始值中定位该值的第一次出现。count字符%28解释为unsigned char所指对象的%29ptr...
参数
| ptr | - | pointer to the object to be examined |
|---|---|---|
| ch | - | character to search for |
| count | - | number of characters to examine |
返回值
指向字符位置的指针，或NULL如果找不到这样的角色。
例
搜索一组字符。
二次
#include <iostream>
#include <cstring>
int main()
{
char arr[] = {'a','\0','a','A','a','a','A','a'};
char *pc = (char*)std::memchr(arr,'A',sizeof arr
if (pc != NULL)
std::cout << "search character found\n";
else
std::cout << "search character not found\n";
}
二次
产出：
二次
search character found
二次
另见
| strchr | finds the first occurrence of a character (function) |
|---|---|
| findfind_iffind_if_not (C++11) | finds the first element satisfying specific criteria (function template) |
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