CodeQL library for C/C++
codeql/cpp-all 1.3.1-dev (changelog, source)
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Predicate useUsePair

A use/use pair is a pair of uses of a particular variable var where the same value might be read (meaning that there is a control-flow path from first to second without crossing a definition of var).

Import path

import cpp
predicate useUsePair(SemanticStackVariable var, Expr first, Expr second)