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AK: Add saturating addition and subtraction to Checked
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AK/Checked.h
22
AK/Checked.h
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@ -199,6 +199,28 @@ public:
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m_value /= other;
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}
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constexpr void saturating_sub(T other)
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{
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sub(other);
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// Depending on whether other was positive or negative, we have to saturate to min or max.
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if (m_overflow && other <= 0)
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m_value = NumericLimits<T>::max();
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else if (m_overflow)
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m_value = NumericLimits<T>::min();
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m_overflow = false;
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}
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constexpr void saturating_add(T other)
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{
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add(other);
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// Depending on whether other was positive or negative, we have to saturate to max or min.
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if (m_overflow && other >= 0)
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m_value = NumericLimits<T>::max();
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else if (m_overflow)
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m_value = NumericLimits<T>::min();
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m_overflow = false;
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}
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constexpr Checked& operator+=(Checked const& other)
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{
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m_overflow |= other.m_overflow;
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