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wmemmove() in CPP

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Prerita Agarwal
Data Specialist @
23 Jul, 2024 @ 01:30 PM


This article discusses Implementation of wmemmove() method in C++. The wmemmove() function is defined in cwchar.h header file. The wmemmove() method copies a set of wide characters from one location to another. The <cwchar> header file contains the wmemmove() method. 

There is a popular quote “Don’t talk, just show me the code!!” abiding by the words let see the implementation of wmemmove() in c++.

Also see, Literals in C, Fibonacci Series in C++

BreakDown of wmemmove() method

The section discusses the detail breakdown of the wmemmove() method in C++. It includes discussion of declaring the prototype, parameters of wmemmove() and return value of the wmemmove() method.

Prototype declaration wmemmove()

wchar_t* wmemmove( wchar_t* dest, const wchar_t* src, size_t count);


Three parameters are sent to the wmemmove() function: dest, src, and count. When the wmemmove() function is invoked, it copies count wide characters from the src memory location to the dest memory address.

Even if the source and dest pointers overlap, copying is done. This is due to the creation of an intermediate buffer where the data is first transferred from src and then copied to dest.

If count is 0, this function has no effect.

Parameters of wmemmove()

src: Pointer to the wide character array from which the contents are copied. 

dest: Pointer to the wide character array from which the contents are copied

count: The number of wide characters to copy from the source to the destination.

Return value of wmemmove()

The wmemmove() function returns the dest pointer.

Also Read - C++ Interview Questions

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Program Implementation

Let us see the implementation of the method in code to get the better understanding of the subject:

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

using namespace std;

int main()
   // setting the format to US ENG to utf8 file format
   setlocale(LC_ALL, "en_US.utf8");

   wchar_t src[] = L"\u03b1\u03b2\u03b3\u03b8\u03bb\u03c9\u03c0";
   wchar_t *dest = &src[2]; // dest and src overlaps
   int count = 5;

   wmemmove(dest, src, count);
   wcout << L"After Processing by wmemmove() method: " << endl;

   for (int i = 0; i < count; i++)

   return 0;


After compiling and running the article in the terminal:

Try this code on online C++ compiler.

Frequently Asked Questions

Which is faster memcpy or Memmove?

"Memcpy is more efficient than memmove," says the author. You're probably not performing the same thing when running the two functions in your situation. In general, only use memmove when absolutely necessary. When there's a good likelihood that the source and destination zones will overlap, use it.

What is the use of Memmove?

The method memmove() copies count bytes from source to dest. As if src were first put into a temporary array, this method permits copying across objects that may overlap.

What is the difference between memcpy and Memmove?

The memcpy() method copies a certain number of bytes from one memory to another. The memmove() method copies a given number of bytes from one memory to another or overlaps two memories.


The article extensively covers the implementation of wmemmove() method in c++, we see the working of code. You might be interested in article such as Inroduction to c++.

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Topics covered
BreakDown of wmemmove() method
Prototype declaration wmemmove()
Parameters of wmemmove()
Return value of wmemmove()
Program Implementation
Frequently Asked Questions
Which is faster memcpy or Memmove?
What is the use of Memmove?
What is the difference between memcpy and Memmove?