CodeQL library for C/C++
codeql/cpp-all 0.4.5 (changelog, source)
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Member predicate MetricClass::getHalsteadN2Distinct

Gets the Halstead “n2” metric: this is the number of distinct operands in this class. An operand is either a variable, constant, type name, or function name.

int getHalsteadN2Distinct()