CodeQL library for C/C++
codeql/cpp-all 1.1.2-dev (changelog, source)
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Member predicate Node::asExpr

Gets the expression corresponding to this node, if any. This predicate only has a result on nodes that represent the value of evaluating the expression. For data flowing out of an expression, like when an argument is passed by reference, use asDefiningArgument instead of asExpr.

Expr asExpr()