# class Crystal::Macros::Generic

- Crystal::Macros::Generic
- Crystal::Macros::ASTNode

##
Overview

A generic instantiation, like `Foo(T)` or `Foo::Bar::Baz(T)`

##
Defined in:

compiler/crystal/macros.cr

##
Instance Method Summary

- #name : Path

  Returns the path to the generic.

- #named_args : NamedTupleLiteral | NilLiteral

  Returns the named arguments of this instantiation, if any.

- #resolve : ASTNode

  Resolves this generic to a `TypeNode` if it denotes a type, or otherwise gives a compile-time error.

- #resolve? : ASTNode | NilLiteral

  Resolves this path to a `TypeNode` if it denotes a type, or otherwise returns a `NilLiteral`.

- #type_vars : ArrayLiteral(ASTNode)

  Returns the arguments (the type variables) of this instantiation.

- #types : ArrayLiteral(ASTNode)

  Returns this generic inside an array literal.

### 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 name : Path #

Returns the path to the generic.

def named_args : NamedTupleLiteral | NilLiteral #

Returns the named arguments of this instantiation, if any.

def resolve : ASTNode #

Resolves this generic to a `TypeNode` if it denotes a type, or otherwise gives a compile-time error.

def resolve? : ASTNode | NilLiteral #

Resolves this path to a `TypeNode` if it denotes a type, or otherwise returns a `NilLiteral`.

def type_vars : ArrayLiteral(ASTNode) #

Returns the arguments (the type variables) of this instantiation.

def types : ArrayLiteral(ASTNode) #

Returns this generic inside an array literal. This method exists so you can call `#types` on the type of a type declaration and get all types, whether it's a Generic, Path or Union.