CodeQL library for C/C++
codeql/cpp-all 3.0.1-dev (changelog, source)
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Predicate signature TypeFlowInput::step

Holds if data can flow from n1 to n2 in one step.

For a given n2, this predicate must include all possible n1 that can flow to n2.

signature predicate step(TypeFlowNode n1, TypeFlowNode n2)