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https://github.com/tfussell/xlnt.git
synced 2024-03-22 13:11:17 +08:00
optional exception check, primarily adding noexcept to signatures
-- also reordered the assignments in set/clear to ensure "has_value_" doesn't change if the assignment operator of T throws
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@ -40,14 +40,17 @@ public:
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/// <summary>
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/// Default contructor. is_set() will be false initially.
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/// </summary>
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optional() : has_value_(false), value_(T())
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optional() noexcept(std::is_nothrow_default_constructible<T>{})
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: has_value_(false), value_(T())
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{
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}
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/// <summary>
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/// Constructs this optional with a value.
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/// noexcept if T copy ctor is noexcept
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/// </summary>
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optional(const T &value) : has_value_(true), value_(value)
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optional(const T &value) noexcept(std::is_nothrow_copy_constructible<T>{})
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: has_value_(true), value_(value)
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{
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}
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@ -55,7 +58,7 @@ public:
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/// Returns true if this object currently has a value set. This should
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/// be called before accessing the value with optional::get().
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/// </summary>
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bool is_set() const
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bool is_set() const noexcept
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{
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return has_value_;
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}
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@ -63,10 +66,10 @@ public:
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/// <summary>
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/// Sets the value to value.
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/// </summary>
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void set(const T &value)
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void set(const T &value) noexcept(std::is_nothrow_assignable<T, T>{})
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{
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has_value_ = true;
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value_ = value;
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has_value_ = true;
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}
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/// <summary>
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@ -101,20 +104,18 @@ public:
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/// Resets the internal value using its default constructor. After this is
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/// called, is_set() will return false until a new value is provided.
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/// </summary>
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void clear()
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void clear() noexcept(std::is_nothrow_assignable<T, T>{} && std::is_nothrow_default_constructible<T>{})
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{
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has_value_ = false;
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value_ = T();
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has_value_ = false;
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}
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/// <summary>
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/// Assignment operator. Equivalent to setting the value using optional::set.
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/// </summary>
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optional &operator=(const T &rhs)
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optional &operator=(const T &rhs) noexcept(noexcept(set(std::declval<T &>())))
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{
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has_value_ = true;
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value_ = rhs;
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set(rhs);
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return *this;
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}
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@ -123,9 +124,10 @@ public:
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/// or both have a value and those values are equal according to
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/// their equality operator.
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/// </summary>
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bool operator==(const optional<T> &other) const
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bool operator==(const optional<T> &other) const noexcept
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{
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if (has_value_ != other.has_value_) {
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if (has_value_ != other.has_value_)
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{
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return false;
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}
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if (!has_value_)
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@ -140,7 +142,7 @@ public:
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/// or both have a value and those values are equal according to
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/// their equality operator.
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/// </summary>
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bool operator!=(const optional<T> &other) const
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bool operator!=(const optional<T> &other) const noexcept
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{
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return !operator==(other);
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}
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