[valarray.unary]

# 29 Numerics library [[numerics]](./#numerics)

## 29.6 Numeric arrays [[numarray]](numarray#valarray.unary)

### 29.6.2 Class template valarray [[template.valarray]](template.valarray#valarray.unary)

#### 29.6.2.6 Unary operators [valarray.unary]

[🔗](#lib:operator+,valarray)

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

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7813)

*Mandates*: The indicated operator can be applied to operands of type T and returns a value of type T (bool foroperator!) or which may be unambiguously implicitly converted to typeT (bool for operator!)[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7820)

*Returns*: A valarray whose length is size()[.](#2.sentence-1)

Each element of the returned array is initialized with the result of
applying the indicated operator to the corresponding element of the array[.](#2.sentence-2)