From Jason Turner

[valarray.unary]

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  #### `valarray` unary operators <a id="valarray.unary">[[valarray.unary]]</a>
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  ``` cpp
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- valarray<T> operator+() const;
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- valarray<T> operator-() const;
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- valarray<T> operator~() const;
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  valarray<bool> operator!() const;
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  ```
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- Each of these operators may only be instantiated for a type `T` to which
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- the indicated operator can be applied and for which the indicated
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- operator returns a value which is of type `T` (`bool` for `operator!`)
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- or which may be unambiguously implicitly converted to type `T` (`bool`
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- for `operator!`).
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- Each of these operators returns an array whose length is equal to the
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- length of the array. Each element of the returned array is initialized
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- with the result of applying the indicated operator to the corresponding
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- element of the array.
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  #### `valarray` unary operators <a id="valarray.unary">[[valarray.unary]]</a>
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  ``` cpp
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+ valarray operator+() const;
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+ valarray operator-() const;
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+ valarray operator~() const;
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  valarray<bool> operator!() const;
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  ```
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+ *Requires:* Each of these operators may only be instantiated for a type
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+ `T` to which the indicated operator can be applied and for which the
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+ indicated operator returns a value which is of type `T` (`bool` for
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+ `operator!`) or which may be unambiguously implicitly converted to type
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+ `T` (`bool` for `operator!`).
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+ *Returns:* A `valarray` whose length is `size()`. Each element of the
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+ returned array is initialized with the result of applying the indicated
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+ operator to the corresponding element of the array.
 
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