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However, C++03 allows initializer-lists only on structs and classes that conform to the Plain Old Data (POD) definition; C++11 extends initializer-lists, so they can be used for all classes including standard containers like std::vector. C++11 binds the concept to a template, called std::initializer_list. This allows constructors and other ...
The constructor has two parts. First is the initializer list which follows the parameter list and before the method body. It starts with a colon and entries are comma-separated. The initializer list is not required, but offers the opportunity to provide values for data members and avoid separate assignment statements.
In C++, a constructor of a class/struct can have an initializer list within the definition but prior to the constructor body. It is important to note that when you use an initialization list, the values are not assigned to the variable. They are initialized. In the below example, 0 is initialized into re and im. Example:
The C++11 uniform initialization syntax and std::initializer_list share the same syntax which are triggered differently depending on the internal workings of the classes. If there is a std::initializer_list constructor then this is called. Otherwise the normal constructors are called with the uniform initialization syntax.
The Standard C++ syntax for a non-placement new expression is [2] new new-type-id ( optional-initializer-expression-list) The placement syntax adds an expression list immediately after the new keyword. This expression list is the placement. It can contain any number of expressions. [2] [3] [6]
The definition of aggregates was changed to explicitly exclude any class with member initializers; therefore, they are not allowed to use aggregate initialization. C++14 relaxes this restriction, [3] allowing aggregate initialization on such types. If the braced init list does not provide a value for that argument, the member initializer takes ...
An aggregate class is a class with no user-declared constructors, no private or protected non-static data members, no base classes, and no virtual functions. [2] Such a class can be initialized with a brace-enclosed comma-separated list of initializer-clauses. [3] The following code has the same semantics in both C and C++.
The MazeGame constructor is a template method that adds some common logic. It refers to the makeRoom() factory method that encapsulates the creation of rooms such that other rooms can be used in a subclass. To implement the other game mode that has magic rooms, the makeRoom method may be overridden: