std::wmemcpy (3) - Linux Manuals

std::wmemcpy: std::wmemcpy

NAME

std::wmemcpy - std::wmemcpy

Synopsis

Defined in header <cwchar>
wchar_t* wmemcpy( wchar_t* dest, const wchar_t* src, std::size_t count );

Copies exactly count successive wide characters from the wide character array pointed to by src to the wide character array pointed to by dest. If the objects overlap, the behavior is undefined. If count is zero, the function does nothing.

Parameters

dest - pointer to the wide character array to copy to
src - pointer to the wide character array to copy from
count - number of wide characters to copy

Return value

dest

Notes

This function's analog for byte strings is std::strncpy, not std::strcpy.
This function is not locale-sensitive and pays no attention to the values of the wchar_t objects it copies: nulls as well as invalid characters are copied too.

Example

// Run this code

  #include <iostream>
  #include <cwchar>
  #include <clocale>
  #include <locale>

  int main(void)
  {
      wchar_t from1[] = L"नमस्ते";
      const size_t sz1 = sizeof from1 / sizeof *from1;
      wchar_t from2[] = L"Բարև";
      const size_t sz2 = sizeof from2 / sizeof *from2;
      wchar_t to[sz1 + sz2];

      std::wmemcpy(to, from1, sz1); // copy from1, along with its null terminator
      std::wmemcpy(to + sz1, from2, sz2); // append from2, along with its null terminator

      std::setlocale(LC_ALL, "en_US.utf8");
      std::cout.imbue(std::locale("en_US.utf8"));
      std::wcout << "Wide array contains: ";
      for(size_t n = 0; n < sizeof to / sizeof *to; ++n)
          if(to[n])
              std::wcout << to[n];
          else
              std::wcout << "\\0";
      std::wcout << '\n';
  }

Possible output:

  Wide array contains: नमस्ते\0Բարև\0