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AK: Add Checked<T>::multiplication_would_overflow()

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This allows you to comfortably test if multiply 2 or 3 values would
cause arithmetic overflow.
This commit is contained in:
Andreas Kling 2020-04-15 17:14:18 +02:00
parent 1b610ac2b6
commit 63b8c6913c
1 changed files with 19 additions and 0 deletions
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19
AK/Checked.h
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@ -234,6 +234,25 @@ public:
return *this; return *this;
} }
template<typename U, typename V, typename X>
static bool multiplication_would_overflow(U u, V v)
{
Checked checked;
checked = u;
checked *= v;
return checked.has_overflow();
}
template<typename U, typename V, typename X>
static bool multiplication_would_overflow(U u, V v, X x)
{
Checked checked;
checked = u;
checked *= v;
checked *= x;
return checked.has_overflow();
}
private: private:
T m_value; T m_value;
bool m_overflow { false }; bool m_overflow { false };