# class Crystal::Macros::Def

- Crystal::Macros::Def
- Crystal::Macros::ASTNode

##
Overview

A method definition.

##
Defined in:

compiler/crystal/macros.cr

##
Instance Method Summary

- #abstract? : BoolLiteral

  Returns `true` is this method is declared as abstract, `false` otherwise.

- #accepts_block? : BoolLiteral

  Returns `true` if this method can be called with a block, `false` otherwise.

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

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

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

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

- #annotations : ArrayLiteral(Annotation)

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

- #args : ArrayLiteral(Arg)

  Returns the arguments of this method.

- #block_arg : Arg | Nop

  Returns the block argument, if any.

- #body : ASTNode

  Returns the body of this method.

- #double_splat : Arg | Nop

  Returns the double splat argument, if any.

- #free_vars : ArrayLiteral(MacroId)

  Returns the free variables of this method, or an empty `ArrayLiteral` if there are none.

- #name : MacroId

  Returns the name of this method.

- #receiver : ASTNode | Nop

  Returns the receiver (for example `self`) of this method definition, or `Nop` if not specified.

- #return_type : ASTNode | Nop

  Returns the return type of the method, if specified.

- #splat_index : NumberLiteral | NilLiteral

  Returns the index of the argument with a *splat, if any.

- #visibility : SymbolLiteral

  Returns the visibility of this def: `:public`, `:protected` or `:private`.

### 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 abstract? : BoolLiteral #

Returns `true` is this method is declared as abstract, `false` otherwise.

def accepts_block? : BoolLiteral #

Returns `true` if this method can be called with a block, `false` otherwise.

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

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

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

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

def annotations : ArrayLiteral(Annotation) #

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

def args : ArrayLiteral(Arg) #

Returns the arguments of this method.

def block_arg : Arg | Nop #

Returns the block argument, if any.

def body : ASTNode #

Returns the body of this method.

def double_splat : Arg | Nop #

Returns the double splat argument, if any.

def free_vars : ArrayLiteral(MacroId) #

Returns the free variables of this method, or an empty `ArrayLiteral` if there are none.

def name : MacroId #

Returns the name of this method.

def receiver : ASTNode | Nop #

Returns the receiver (for example `self`) of this method definition, or `Nop` if not specified.

def return_type : ASTNode | Nop #

Returns the return type of the method, if specified.

def splat_index : NumberLiteral | NilLiteral #

Returns the index of the argument with a *splat, if any.

def visibility : SymbolLiteral #

Returns the visibility of this def: `:public`, `:protected` or `:private`.