CodeQL library for C/C++
codeql/cpp-all 0.4.4 (changelog, source)
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Member predicate CustomOptions::okToIgnoreReturnValue

Holds if it is reasonable to ignore the return value of function call fc.

By default holds for calls to select where the first argument is 0 (commonly used as a way of sleeping), and any call inside a macro expansion.

predicate okToIgnoreReturnValue(FunctionCall fc)