CodeQL library for C/C++
codeql/cpp-all 0.4.0-dev (changelog, source)
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Predicate startsWithIfndef

Holds if hf begins with an #ifndef or #if directive ifndef, to test the macro named macroName.

Import path

import semmle.code.cpp.headers.MultipleInclusion
predicate startsWithIfndef(HeaderFile hf, PreprocessorDirective ifndef, string macroName)