# class Crystal::Macros::MetaVar

- Crystal::Macros::MetaVar
- Crystal::Macros::ASTNode

##
Overview

A fictitious node representing a variable or instance variable, together with type information.

##
Defined in:

compiler/crystal/macros.cr

##
Instance Method Summary

- #annotation(type : TypeNode) : Annotation | NilLiteral

  Returns the last `Annotation` with the given `#type` attached to this variable or `NilLiteral` if there are none.

- #annotations(type : TypeNode) : ArrayLiteral(Annotation)

  Returns an array of annotations with the given `#type` attached to this variable, or an empty `ArrayLiteral` if there are none.

- #annotations : ArrayLiteral(Annotation)

  Returns an array of all annotations attached to this variable, or an empty `ArrayLiteral` if there are none.

- #default_value : ASTNode

  Returns the default value of this variable.

- #has_default_value? : BoolLiteral

  Returns whether this variable has a default value (which can in turn be `nil`).

- #name : MacroId

  Returns the name of this variable.

- #type : TypeNode | NilLiteral

  Returns the type of this variable, if known, or `nil`.

### Instance methods inherited from class `Crystal::Macros::ASTNode`

!=(other : ASTNode) : BoolLiteral !=, ==(other : ASTNode) : BoolLiteral ==, class_name : StringLiteral class_name, column_number : StringLiteral | NilLiteral column_number, doc : StringLiteral doc, doc_comment : MacroId doc_comment, end_column_number : StringLiteral | NilLiteral end_column_number, end_line_number : StringLiteral | NilLiteral end_line_number, filename : StringLiteral | NilLiteral filename, id : MacroId id, is_a?(type : TypeNode) : BoolLiteral is_a?, line_number : StringLiteral | NilLiteral line_number, nil? : BoolLiteral nil?, raise(message) : NoReturn raise, stringify : StringLiteral stringify, symbolize : SymbolLiteral symbolize, warning(message : StringLiteral) : NilLiteral warning

##
Instance Method Detail

def annotation(type : TypeNode) : Annotation | NilLiteral #

Returns the last `Annotation` with the given `#type` attached to this variable or `NilLiteral` if there are none.

def annotations(type : TypeNode) : ArrayLiteral(Annotation) #

Returns an array of annotations with the given `#type` attached to this variable, or an empty `ArrayLiteral` if there are none.

def annotations : ArrayLiteral(Annotation) #

Returns an array of all annotations attached to this variable, or an empty `ArrayLiteral` if there are none.

def default_value : ASTNode #

Returns the default value of this variable. Note that if the variable doesn't have a default value, or the default value is `nil`, a `NilLiteral` will be returned. To distinguish between these cases, use `#has_default_value?`.

def has_default_value? : BoolLiteral #

Returns whether this variable has a default value (which can in turn be `nil`).

def name : MacroId #

Returns the name of this variable.

def type : TypeNode | NilLiteral #

Returns the type of this variable, if known, or `nil`.