Cpp.PlaceholderTypeSpecifier Class

Namespace: Cpp
Superclasses: AstNodeProperties

Represents the placeholder_type_specifier nodes in the syntax tree of your code

Since R2026a

Description

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

Predicates

Type

Type	Raisable	Printable
PlaceholderTypeSpecifier	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 PlaceholderTypeSpecifier &pts)	Finds syntax nodes of the type PlaceholderTypeSpecifier in your C++ code and returns them as pts. A PlaceholderTypeSpecifier represents placeholder type specifiers such as auto and decltype, including concept‑constrained placeholders introduced in C++20.
isa(Cpp.Node.Node node)	Checks if node is a PlaceholderTypeSpecifier. Use this relation if you want to negate the condition (for example: not Cpp.PlaceholderTypeSpecifier.isa(n)).
cast(Cpp.Node.Node node, required PlaceholderTypeSpecifier &cast)	Finds syntax nodes of the type PlaceholderTypeSpecifier from the nodes in node. Retrieval occurs if node is compatible with the PlaceholderTypeSpecifier type. Use this relation if you need further PlaceholderTypeSpecifier properties.
auto(PlaceholderTypeSpecifier self, Cpp.Node.Node &child)	Matches the auto placeholder type specifier. For example, in auto x = 42;, this predicate matches the auto keyword.
decltype(PlaceholderTypeSpecifier self, Cpp.Node.Node &child)	Matches the decltype placeholder type specifier. For example, in decltype(x) y = x;, this predicate matches decltype(x).
constraint(PlaceholderTypeSpecifier self, Cpp.Node.Node &child)	Matches a constraint applied to a placeholder type specifier. This is used for concept‑constrained placeholders, such as constrained auto declarations introduced in C++20.
isEnclosedInPlaceholderTypeSpecifier(Cpp.Node.Node child)	Checks if child appears inside a PlaceholderTypeSpecifier.
getEnclosingPlaceholderTypeSpecifier(Cpp.Node.Node child, required PlaceholderTypeSpecifier &parent)	Finds the nearest enclosing PlaceholderTypeSpecifier ancestor of child and returns it as parent.

Version History

Introduced in R2026a