What is std :: initializer list?

What is std :: initializer list?

An object of type std::initializer_list is a lightweight proxy object that provides access to an array of objects of type const T . ... a braced-init-list is used to list-initialize an object, where the corresponding constructor accepts an std::initializer_list parameter.

What is an initializer list in C ++?

The initializer list is used to directly initialize data members of a class. ... The list begins with a colon ( : ) and is followed by the list of variables that are to be initialized – all of​ the variables are separated by a comma with their values in curly brackets.

How does STD initializer list work?

When a compiler sees an initializer list, it automatically converts it into an object of type std::initializer_list. Therefore, if we create a constructor that takes a std::initializer_list parameter, we can create objects using the initializer list as an input.

What is initializer in C?

Initializer. In C/C99/C++, an initializer is an optional part of a declarator. It consists of the '=' character followed by an expression or a comma-separated list of expressions placed in curly brackets (braces).

When should you use initializer list?

Initializer List is used in initializing the data members of a class. The list of members to be initialized is indicated with constructor as a comma-separated list followed by a colon. Following is an example that uses the initializer list to initialize x and y of Point class.

What is the name of the initializer in a class declaration in Swift?

Swift defines two kinds of initializers for class types to help ensure all stored properties receive an initial value. These are known as designated initializers and convenience initializers.

What is an initializer in Arduino?

The member initializer list is specified after the arguments of the constructor. It begins with a colon followed by the name of each variable to initialize, separated by commas [1]. The value to assign to each data member is specified between parenthesis after the name of each data member of the list.

What is a designated initializer?

A designated initializer, or designator, points out a particular element to be initialized. A designator list is a comma-separated list of one or more designators. ... The initializer list can omit elements that are declared anywhere in the aggregate, rather than only at the end.

What is a designated initializer Swift?

Designated initializers are the primary initializers for a class. A designated initializer fully initializes all properties introduced by that class and calls an appropriate superclass initializer to continue the initialization process up the superclass chain.

What is a constructor initializer and why should your class use one?

Constructor is a special non-static member function of a class that is used to initialize objects of its class type. In the definition of a constructor of a class, member initializer list specifies the initializers for direct and virtual bases and non-static data members.