C++: Difference between revisions

C++ (view source)

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 Resource Acquisition Is Initialization - binds the life cycle of a resource to the lifetime of an object.<br>
 For instance, the resource for a vector is an allocated amount of memory. Once the vector is destroyed and the destructor called, the resource is released.<br>
-In general, each RAII object should have all of the following:
-* Constructor acquiring resources
+The rule for RAII is if you need any from one of the rules, you need to implement the remainder
+Rule of zero:<br>
+Do not use a custom deconstructor, copy constructor, or copy assignment. Push all of these operations into the classes of member variables such as <code>std::vector</code> and <code>unique_ptr</code>. This is the best and simplest cast.
 [[Wikipedia: Rule of three (C++ programming) | Rule of three]]
 * Destructor
 * Copy constructor
-* Assignment operator
+* Copy assignment operator
 [[Wikipedia: Rule of three (C++ programming)#Rule of five | Rule of five]]
+* All from rule of three plus:
 * Move constructor
+* Move operator
+Rule of four and a half:
+* Destructor
+* Copy constructor
+* Copy-and-swap assignment operator
 * Swap function
-{{hidden | Example RAII Class |
+{{hidden | Example Rule of Four RAII Class |
 Copied from [https://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom stack overflow]
 <syntaxhighlight lang="cpp">