Immutable object: Difference between revisions

Revision as of 11:59, 17 August 2021

Revision as of 12:03, 17 August 2021

Line 92:

=== C++ ===

In C++, a [[const-correctness|const-correct]] implementation of <code>Cart</code> would allow the user to declare newcreate instances of the class and then use them as either <code>const</code> (immutable) or mutable, as desired, by providing two different versions of the <code>items()</code> method. (Notice that in C++ it is not necessary — and in fact impossible — to provide a specialized constructor for <code>const</code> instances.)

<syntaxhighlight lang="cpp">

class Cart {

public:

Cart(std::vector<Item>& items): items_(std::move(items)) {}

std::vector<Item>& items() { return items_; }

Line 105:

private:

std::vector<Item>& items_;

};

</syntaxhighlight>