Cpp.Auto Class

Namespace: Cpp
Superclasses: AstNodeProperties

Represents the auto nodes in the syntax tree of your code

Since R2026a

Description

The PQL class Cpp.Auto represents the node auto in the syntax tree of your code.

void foo() {
    auto x = 42;
    auto *y = &x;
}

The code shows two auto type-specifiers. Each auto keyword in the code corresponds to a Cpp.Auto node in the syntax tree.

Predicates

expand all

Type

Type	Raisable	Printable
`Auto`	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 Example

Predicates	Description	Example
`is(required Auto &autoNode)`	Matches a `Cpp.Auto` node and returns it as `autoNode`	This PQL defect checks for `auto` type-specifiers in declarations. defect AutoIsDefect = when Cpp.Auto.is(&autoNode) and autoNode.nodeText(&txt) raise "Found auto: \"{txt}\"" on autoNode In this C++ code, the defect finds declarations that use the `auto` type-specifier. int main() { auto value = 10; auto *ptr = &value; (void)ptr; }
`cast(Cpp.Node.Node node, required Auto &cast)`	Checks whether a given `Node` is an `auto` node and if so returns the `Auto` node as `cast`.	This PQL defect finds `auto` nodes by starting from generic syntax nodes and then casting them to `Auto`. defect AutoCastDefect = when Cpp.Node.is(&node, &,&,&) and Cpp.Auto.cast(node, &autoNode) and autoNode.nodeText(&txt) raise "Node cast to Auto: \"{txt}\"" on autoNode In this C++ code, the defect finds the `auto` token. void bar() { auto n = 3; (void)n; }
`isa(Cpp.Node.Node node)`	Returns true if the provided `Node` is an `Auto` node allowing negative checks or boolean tests.	This PQL defect checks whether a generic `Node` is an `auto` node using a boolean-style predicate. defect AutoIsaDefect = when Cpp.Node.is(&node, &,&,&) and Cpp.Auto.isa(node) raise "Node is isa Auto" on node In this C++ code, the defect finds the `auto` token. void bar() { auto n = 3; (void)n; }

is(required Auto &autoNode)

Matches a Cpp.Auto node and returns it as autoNode

This PQL defect checks for auto type-specifiers in declarations.

defect AutoIsDefect =
  when
    Cpp.Auto.is(&autoNode)
    and autoNode.nodeText(&txt)
  raise "Found auto: \"{txt}\""
  on autoNode

In this C++ code, the defect finds declarations that use the auto type-specifier.

int main() {
    auto value = 10;
    auto *ptr = &value;
    (void)ptr;
}

cast(Cpp.Node.Node node, required Auto &cast)

Checks whether a given Node is an auto node and if so returns the Auto node as cast.

This PQL defect finds auto nodes by starting from generic syntax nodes and then casting them to Auto.

defect AutoCastDefect =
  when
    Cpp.Node.is(&node, &,&,&)
    and Cpp.Auto.cast(node, &autoNode)
    and autoNode.nodeText(&txt)
  raise "Node cast to Auto: \"{txt}\""
  on autoNode

In this C++ code, the defect finds the auto token.

void bar() {
    auto n = 3;
    (void)n;
}

isa(Cpp.Node.Node node)

Returns true if the provided Node is an Auto node allowing negative checks or boolean tests.

This PQL defect checks whether a generic Node is an auto node using a boolean-style predicate.

defect AutoIsaDefect =
  when
    Cpp.Node.is(&node, &,&,&)
    and Cpp.Auto.isa(node)
  raise "Node is isa Auto"
  on node

In this C++ code, the defect finds the auto token.

void bar() {
    auto n = 3;
    (void)n;
}

Version History

Introduced in R2026a