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Showing content from https://timsong-cpp.github.io/cppwp/n4659/valarray.unary below:

[valarray.unary]

29 Numerics library [numerics] 29.7 Numeric arrays [numarray] 29.7.2 Class template valarray [template.valarray] 29.7.2.6 valarray unary operators [valarray.unary]

valarray operator+() const; valarray operator-() const; valarray operator~() const; valarray<bool> operator!() const;

Requires: Each of these operators may only be instantiated for a type T to which the indicated operator can be applied and for which the indicated operator returns a value which is of type T (bool for operator!) or which may be unambiguously implicitly converted to type T (bool for operator!).

Returns: A valarray whose length is size(). Each element of the returned array is initialized with the result of applying the indicated operator to the corresponding element of the array.


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