| Defined in header <cwchar> | ||
|---|---|---|
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 ); |
Locates the first occurrence of wide character ch in the initial count wide characters of the wide character array pointed to by ptr.
If count is zero, the function returns a null pointer.
Parameters
| ptr | - | pointer to the wide character array to be examined |
| ch | - | wide character to search for |
| count | - | number of wide characters to examine |
Return value
Pointer to the location of the wide character, or a null pointer if no such character is found.
Example
#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";
}
}Possible output:
Found '许' at position 14
See also
| searches an array for the first occurrence of a character (function) | |
| finds the first occurrence of a character (function) | |
| finds the first occurrence of a wide character in a wide string (function) | |
| (C++11) | finds the first element satisfying specific criteria (function template) |
C documentation for wmemchr | |
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