std::wmemchr (3) - Linux Manuals

std::wmemchr: std::wmemchr

NAME

std::wmemchr - std::wmemchr

Synopsis

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

// Run this code

  #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