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

expand all

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