func increment()

in Sources/CoreMetrics/Metrics.swift [594:627]

• 22 lines of code
• 3 McCabe index (conditional complexity)

    func increment(by amount: Double) {
        // Drop illegal values
        // - cannot increment by NaN
        guard !amount.isNaN else { return }
        // - cannot increment by infinite quantities
        guard !amount.isInfinite else { return }
        // - cannot increment by negative values
        guard amount.sign == .plus else { return }
        // - cannot increment by zero
        guard !amount.isZero else { return }

        if amount.exponent >= 63 {
            // If amount is in Int64.max..<+Inf, ceil to Int64.max
            self.lock.withLockVoid {
                self.counterHandler.increment(by: .max)
            }
        } else {
            // Split amount into integer and fraction components
            var (increment, fraction) = self.integerAndFractionComponents(of: amount)
            self.lock.withLockVoid {
                // Add the fractional component to the accumulated fraction.
                self.fraction += fraction
                // self.fraction may have cross an integer boundary, Split it
                // and add any integer component.
                let (integer, fraction) = integerAndFractionComponents(of: self.fraction)
                increment += integer
                self.fraction = fraction
                // Increment the handler by the total integer component.
                if increment > 0 {
                    self.counterHandler.increment(by: increment)
                }
            }
        }
    }