CodeQL library for C/C++
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Member predicate Node::asDefiningArgument

Gets the argument that defines this DefinitionByReferenceNode, if any. This predicate should be used instead of asExpr when referring to the value of a reference argument after the call has returned. For example, in f(&x), this predicate will have &x as its result for the Node that represents the new value of x.

Expr asDefiningArgument()