C++ Utility Library - move Function

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Description

It returns an rvalue reference to arg.

Declaration

Following is the declaration for std::move function.

template <class T>
typename remove_reference<T>::type&& move (T&& arg) noexcept;

C++11

template <class T>
typename remove_reference<T>::type&& move (T&& arg) noexcept;

Parameters

arg − It is an object.

Return Value

It returns an rvalue reference that refers to arg.

Exceptions

Basic guarantee − This function never throws exceptions.

Data races

Calling this function introduces no data races.

Example

In below example explains about std::move function.

#include <utility>
#include <iostream>
#include <vector>
#include <string>

int main () {
   std::string foo = "It is a foo string";
   std::string bar = "It is a bar string";
   std::vector<std::string> myvector;

   myvector.push_back (foo);
   myvector.push_back (std::move(bar));

   std::cout << "myvector contains:";
   for (std::string& x:myvector) std::cout << ' ' << x;
   std::cout << '\n';

   return 0;
}

Let us compile and run the above program, this will produce the following result −

myvector contains: It is a foo string It is a bar string