Templated C++ class representing optional values
Use optional objects to represent values that might or might not
exist.
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Namespace: | matlab::data |
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Include: |
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Array type, specified as
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optional()
optional(const optional& other)
Creates a shared data copy.
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Value to copy. |
None
optional<T>& operator=(const optional<T>& other)
Assigns a shared data copy.
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Value to copy. |
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Updated instance. |
None
optional(optional&& other)
optional(T&& value)
Moves contents of an optional object to a new instance.
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Value to move. |
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| Value of type T to move. |
None
optional<T>& operator=(optional<T>&& other)
optional<T>& operator=(T&& value)
Assigns the input to this instance.
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Value to move. |
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Updated instance. |
None
operator=optional<T>& operator=(nullopt_t)
optional<T>& operator=(const optional<T>& other)
optional<T>& operator=(optional<T>&& other)
optional<T>& operator=(T&& value)
optional<T>& operator=(const T& value)
Assignment operators.
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Updated instance. |
None
operator->const T* operator->() const
T* operator->()
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Pointer to the element. |
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operator*const T& operator*() const
T& operator*()
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| Reference to the element. |
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operator Toperator T() const
Cast optional<T> value to T.
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Value contained in |
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There is no value. |
boolexplicit operator bool() const
Check whether object contains a value.
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True, if object contains a value. |
None
has_valuebool has_value() const
Check whether object contains a value.
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True, if object contains a value. |
None
swapvoid swap(optional &other)
Swap value of this optional instance with value contained in the parameter.
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Value to swap. |
None
resetvoid reset()
Reset optional value to missing
None