Move assignment operator: Difference between revisions

Revision as of 12:02, 12 June 2019

Revision as of 09:37, 13 June 2019

Line 12:

* The operator must return a reference to "*this".

An implementation ofConsider the following move assignment operator for a simple string class:<ref>{{Cite web|title = Move Constructors and Move Assignment Operators (C++)|url = https://msdn.microsoft.com/en-us/library/dd293665.aspx|website = msdn.microsoft.com|access-date = 2016-02-23}}</ref><syntaxhighlight lang="c++">

class ResourceString {

voidchar* data;

public:

ResourceString& operator=(ResourceString&& other) {

if (this != &other) { // If we're not trying to move the object into itself...

delete this->data; // Delete the objectstring's original data.

this->data = other.data; // Copy the other objectstring's data into this objectstring.

other.data = nullptr; // Finally, reset the other objectstring's data pointer.

}

return *this;

}

};

</syntaxhighlight>A more practical example:<syntaxhighlight lang="c++">

class String {

char* text;

public:

String& operator=(String&& otherString) {

if (this != &otherString) {

delete[] text;

this->text = otherString.text;

otherString.text = nullptr;

}

return *this;

}

};

</syntaxhighlight>

==References==

<references />