CodeQL library for C/C++
codeql/cpp-all 0.3.2 (changelog, source)
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Member predicate MetricClass::getHalsteadN1Distinct

Gets the Halstead “n1” metric: this is the total number of distinct operators in this class. Operators are defined as in the “N1” metric (getHalsteadN1).

int getHalsteadN1Distinct()