std::wmemmove

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

char_traits

 

Null-terminated wide strings

Functions
Character manipulation
iswalnum iswalpha iswlower iswupper iswdigit iswxdigit iswblank (C++11) wctype iswctype	iswcntrl iswgraph iswspace iswprint iswpunct towlower towupper wctrans towctrans
Conversions to numeric formats
wcstolwcstoll wcstoulwcstoull	wcstofwcstodwcstold wcstoimaxwcstouimax (C++11)(C++11)
String manipulation
wcslen wcscpy wcsncpy wcscat wcsncat wcscmp wcscoll wcsncmp	wcsxfrm wcschr wcsrchr wcspbrk wcsspn wcscspn wcsstr wcstok
Array manipulation
wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset

 

Defined in header <cwchar>
wchar_t* wmemmove( 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 count is zero, the function does nothing.

The arrays may overlap: copying takes place as if the wide characters were copied to a temporary wide character array and then copied from the temporary array to dest.

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

Returns a copy of dest

Notes

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 <locale>
#include <clocale>
 
int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    std::wcout.imbue(std::locale("en_US.utf8"));
 
    wchar_t str[] = L"αβγδεζηθικλμνξοπρστυφχψω";
    std::wcout << str << '\n';
    std::wmemmove(str+4, str+3, 3); // copy from [δεζ] to [εζη]
    std::wcout << str << '\n';
}

Possible output:

αβγδεζηθικλμνξοπρστυφχψω
αβγδδεζθικλμνξοπρστυφχψω

See also

wmemcpy	copies a certain amount of wide characters between two non-overlapping arrays (function)
memmove	moves one buffer to another (function)
copycopy_if (C++11)	copies a range of elements to a new location (function template)
copy_backward	copies a range of elements in backwards order (function template)
C documentation for wmemmove