std::wmemchr
STD：Wmemchr
| Defined in header | | |
|---|---|---|
| const wchar_t* wmemchr( const wchar_t* ptr, wchar_t ch, std::size_t count | | |
| wchar_t* wmemchr( wchar_t* ptr, wchar_t ch, std::size_t count | | |
定位宽字符的第一次出现ch在开头count所指向的宽字符数组的宽字符。ptr...
如果count函数返回一个空指针。
参数
| ptr | - | pointer to the wide character array to be examined |
|---|---|---|
| ch | - | wide character to search for |
| count | - | number of wide characters to examine |
返回值
指向宽字符位置的指针，如果找不到宽字符，则为空指针。
例
二次
#include <iostream>
#include <cwchar>
#include <clocale>
#include <locale>
int main()
{
const wchar_t str[] = L"诺不轻信，故人不负我\0诺不轻许，故我不负人。";
wchar_t target = L'许';
const std::size_t sz = sizeof str / sizeof *str;
if (const wchar_t* result = std::wmemchr(str, target, sz)) {
std::setlocale(LC_ALL, "en_US.utf8"
std::wcout.imbue(std::locale("en_US.utf8")
std::wcout << "Found '" << target
<< "' at position " << result - str << "\n";
}
}
二次
可能的产出：
二次
Found '许' at position 14
二次
另见
| memchr | searches an array for the first occurrence of a character (function) |
|---|---|
| strchr | finds the first occurrence of a character (function) |
| wcschr | finds the first occurrence of a wide character in a wide string (function) |
| findfind_iffind_if_not (C++11) | finds the first element satisfying specific criteria (function template) |
C.wmemchr文件
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