Cpp.Decltype Class

Namespace: Cpp
Superclasses: AstNodeProperties

Represents the decltype nodes in the syntax tree of your code

Since R2026a

Description

Decltype class represents the C++ syntax node decltype in your code and contains predicates to query properties and children of this node.

Predicates

Type

Type	Raisable	Printable
Decltype	Yes	No

Syntaxes

This class defines these predicates that act on the objects of this class. In addition, objects of this class can access the predicates defined by the base class AstNodeProperties. An object of this class is an object of AstNodeProperties class.

Predicates	Description
is(required Decltype &dt)	Finds syntax nodes of the type Decltype in your C++ code and returns them as dt. A Decltype represents the decltype type specifier used to deduce a type from an expression.
isa(Cpp.Node.Node node)	Checks if node is a Decltype. Use this relation if you want to negate the condition (for example: not Cpp.Decltype.isa(n)).
cast(Cpp.Node.Node node, required Decltype &cast)	Finds syntax nodes of the type Decltype from the nodes in node. Retrieval occurs if node is compatible with the Decltype type. Use this relation if you need further Decltype properties.
expression(Decltype self, Cpp.Node.Node &child)	Matches the expression inside a decltype specifier. For example, in decltype(x + y) z;, this predicate matches the x + y expression.
auto(Decltype self, Cpp.Node.Node &child)	Matches the auto keyword used in a decltype(auto) construct. For example, in decltype(auto) f();, this predicate matches auto.
isEnclosedInDecltype(Cpp.Node.Node child)	Checks if child appears inside a Decltype.
getEnclosingDecltype(Cpp.Node.Node child, required Decltype &parent)	Finds the nearest enclosing Decltype ancestor of child and returns it as parent.

Version History

Introduced in R2026a