Initializer list
An initializer list is a brace-enclosed sequence of initial values used to initialize an object or supply initialization values to a construct.
Learn C++ by Example
An initializer list is a brace-enclosed sequence of initial values used to initialize an object or pass initialization values to a construct.
- How it is used
- Constructs vectors, objects, and temporary value sequences directly from known values.
- How deep it goes
- Explains brace syntax, constructor ambiguity, narrowing prevention, and practical container use without exploring initialization's full complexity.
- Examples
- Uses vector initialization, an integer declaration, and a card-deck suit list as concrete examples.
- What you can do after
- Apply it via std::vector, std::array, and object construction while avoiding unintended counts and narrowing conversions.
100 C++ Mistakes and How to Avoid Them
An initializer list is a sequence of initialization elements supplied using brace syntax to initialize objects, constructors, or containers.
- How it is used
- Initializes instance variables efficiently and establishes valid object state during construction.
- How deep it goes
- Explains declaration-order semantics, constructor-body drawbacks, uninitialized built-ins, and validation, but does not cover broader syntax.
- Examples
- Uses Person examples to contrast incorrect member order, constructor-body assignment, disciplined ordering, and validated age initialization.
- What you can do after
- Apply it via C++ constructor initializer lists to initialize every member, preserve dependencies, and validate parameters before use.
Read how 100 C++ Mistakes and How to Avoid Them explains initializer list →
Related concepts
- vectorproduces · A vector is an ordered, indexed sequence of elements, often numerical, represented as a mathematical quantity or a computational collection.
- instance variableuses · An instance variable is data associated with a particular object, rather than shared across all instances of its class or type.
- Mapconfigures · A map is an associative data structure that stores key-value pairs and supports retrieving values by key.
- default constructoraddresses · A default constructor is a constructor that can be invoked without caller-supplied arguments, whether explicitly declared or implicitly provided by a language or compiler.
- uniform initializationused by · Uniform initialization is C++ syntax that uses braces to initialize objects and values.
- copy assignment operatorcontrasts with · A copy assignment operator is a C++ special member function that copies state from one object into an already existing object of a compatible type.
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