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https://github.com/RGBCube/serenity
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Checked: constexpr support
Problem: - `Checked` is not `constexpr`-aware. Solution: - Decorate member functions with `constexpr` keyword. - Add tests to ensure the functionality where possible.
This commit is contained in:
Lenny Maiorani
Andreas Kling
parent
bd99083436
commit
a40abd6ce3
3 changed files with 312 additions and 43 deletions
82
AK/Checked.h
82
AK/Checked.h
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@ -112,111 +112,111 @@ inline constexpr bool is_within_range(Source value)
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template<typename T>
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class Checked {
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public:
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Checked() = default;
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constexpr Checked() = default;
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Checked(T value)
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constexpr Checked(T value)
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: m_value(value)
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{
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}
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template<typename U>
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Checked(U value)
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constexpr Checked(U value)
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{
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m_overflow = !is_within_range<T>(value);
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m_value = value;
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}
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Checked(const Checked&) = default;
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constexpr Checked(const Checked&) = default;
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Checked(Checked&& other)
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constexpr Checked(Checked&& other)
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: m_value(exchange(other.m_value, 0))
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, m_overflow(exchange(other.m_overflow, false))
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{
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}
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template<typename U>
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Checked& operator=(U value)
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constexpr Checked& operator=(U value)
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{
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return *this = Checked(value);
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}
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Checked& operator=(const Checked& other) = default;
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constexpr Checked& operator=(const Checked& other) = default;
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Checked& operator=(Checked&& other)
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constexpr Checked& operator=(Checked&& other)
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{
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m_value = exchange(other.m_value, 0);
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m_overflow = exchange(other.m_overflow, false);
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return *this;
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}
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bool has_overflow() const
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constexpr bool has_overflow() const
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{
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return m_overflow;
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}
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ALWAYS_INLINE bool operator!() const
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ALWAYS_INLINE constexpr bool operator!() const
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{
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ASSERT(!m_overflow);
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return !m_value;
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}
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ALWAYS_INLINE T value() const
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ALWAYS_INLINE constexpr T value() const
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{
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ASSERT(!m_overflow);
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return m_value;
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}
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void add(T other)
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constexpr void add(T other)
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{
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m_overflow |= __builtin_add_overflow(m_value, other, &m_value);
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}
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void sub(T other)
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constexpr void sub(T other)
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{
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m_overflow |= __builtin_sub_overflow(m_value, other, &m_value);
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}
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void mul(T other)
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constexpr void mul(T other)
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{
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m_overflow |= __builtin_mul_overflow(m_value, other, &m_value);
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}
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void div(T other)
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constexpr void div(T other)
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{
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m_value /= other;
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}
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Checked& operator+=(T other)
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constexpr Checked& operator+=(T other)
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{
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add(other);
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return *this;
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}
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Checked& operator-=(T other)
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constexpr Checked& operator-=(T other)
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{
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sub(other);
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return *this;
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}
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Checked& operator*=(T other)
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constexpr Checked& operator*=(T other)
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{
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mul(other);
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return *this;
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}
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Checked& operator/=(T other)
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constexpr Checked& operator/=(T other)
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{
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div(other);
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return *this;
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}
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Checked& operator++()
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constexpr Checked& operator++()
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{
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add(1);
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return *this;
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}
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Checked operator++(int)
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constexpr Checked operator++(int)
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{
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Checked old { *this };
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add(1);
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@ -224,7 +224,7 @@ public:
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}
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template<typename U, typename V>
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static bool addition_would_overflow(U u, V v)
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static constexpr bool addition_would_overflow(U u, V v)
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{
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#ifdef __clang__
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Checked checked;
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@ -237,7 +237,7 @@ public:
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}
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template<typename U, typename V>
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static bool multiplication_would_overflow(U u, V v)
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static constexpr bool multiplication_would_overflow(U u, V v)
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{
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#ifdef __clang__
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Checked checked;
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@ -250,7 +250,7 @@ public:
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}
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template<typename U, typename V, typename X>
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static bool multiplication_would_overflow(U u, V v, X x)
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static constexpr bool multiplication_would_overflow(U u, V v, X x)
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{
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Checked checked;
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checked = u;
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@ -265,7 +265,7 @@ private:
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};
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template<typename T>
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inline Checked<T> operator+(const Checked<T>& a, const Checked<T>& b)
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constexpr Checked<T> operator+(const Checked<T>& a, const Checked<T>& b)
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{
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Checked<T> c { a };
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c.add(b.value());
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@ -273,7 +273,7 @@ inline Checked<T> operator+(const Checked<T>& a, const Checked<T>& b)
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}
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template<typename T>
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inline Checked<T> operator-(const Checked<T>& a, const Checked<T>& b)
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constexpr Checked<T> operator-(const Checked<T>& a, const Checked<T>& b)
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{
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Checked<T> c { a };
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c.sub(b.value());
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@ -281,7 +281,7 @@ inline Checked<T> operator-(const Checked<T>& a, const Checked<T>& b)
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}
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template<typename T>
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inline Checked<T> operator*(const Checked<T>& a, const Checked<T>& b)
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constexpr Checked<T> operator*(const Checked<T>& a, const Checked<T>& b)
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{
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Checked<T> c { a };
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c.mul(b.value());
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@ -289,7 +289,7 @@ inline Checked<T> operator*(const Checked<T>& a, const Checked<T>& b)
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}
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template<typename T>
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inline Checked<T> operator/(const Checked<T>& a, const Checked<T>& b)
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constexpr inline Checked<T> operator/(const Checked<T>& a, const Checked<T>& b)
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{
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Checked<T> c { a };
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c.div(b.value());
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@ -297,79 +297,79 @@ inline Checked<T> operator/(const Checked<T>& a, const Checked<T>& b)
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}
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template<typename T>
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inline bool operator<(const Checked<T>& a, T b)
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constexpr bool operator<(const Checked<T>& a, T b)
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{
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return a.value() < b;
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}
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template<typename T>
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inline bool operator>(const Checked<T>& a, T b)
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constexpr bool operator>(const Checked<T>& a, T b)
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{
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return a.value() > b;
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}
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template<typename T>
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inline bool operator>=(const Checked<T>& a, T b)
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constexpr bool operator>=(const Checked<T>& a, T b)
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{
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return a.value() >= b;
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}
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template<typename T>
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inline bool operator<=(const Checked<T>& a, T b)
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constexpr bool operator<=(const Checked<T>& a, T b)
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{
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return a.value() <= b;
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}
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template<typename T>
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inline bool operator==(const Checked<T>& a, T b)
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constexpr bool operator==(const Checked<T>& a, T b)
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{
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return a.value() == b;
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}
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template<typename T>
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inline bool operator!=(const Checked<T>& a, T b)
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constexpr bool operator!=(const Checked<T>& a, T b)
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{
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return a.value() != b;
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}
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template<typename T>
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inline bool operator<(T a, const Checked<T>& b)
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constexpr bool operator<(T a, const Checked<T>& b)
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{
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return a < b.value();
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}
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template<typename T>
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inline bool operator>(T a, const Checked<T>& b)
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constexpr bool operator>(T a, const Checked<T>& b)
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{
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return a > b.value();
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}
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template<typename T>
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inline bool operator>=(T a, const Checked<T>& b)
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constexpr bool operator>=(T a, const Checked<T>& b)
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{
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return a >= b.value();
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}
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template<typename T>
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inline bool operator<=(T a, const Checked<T>& b)
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constexpr bool operator<=(T a, const Checked<T>& b)
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{
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return a <= b.value();
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}
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template<typename T>
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inline bool operator==(T a, const Checked<T>& b)
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constexpr bool operator==(T a, const Checked<T>& b)
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{
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return a == b.value();
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}
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template<typename T>
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inline bool operator!=(T a, const Checked<T>& b)
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constexpr bool operator!=(T a, const Checked<T>& b)
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{
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return a != b.value();
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}
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template<typename T>
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inline Checked<T> make_checked(T value)
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constexpr Checked<T> make_checked(T value)
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{
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return Checked<T>(value);
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}
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