[valarray.cassign]

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

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

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

#### 29.6.2.7 Compound assignment [valarray.cassign]

[🔗](#lib:operator*=,valarray)

`valarray& operator*= (const valarray& v);
valarray& operator/= (const valarray& v);
valarray& operator%= (const valarray& v);
valarray& operator+= (const valarray& v);
valarray& operator-= (const valarray& v);
valarray& operator^= (const valarray& v);
valarray& operator&= (const valarray& v);
valarray& operator|= (const valarray& v);
valarray& operator<<=(const valarray& v);
valarray& operator>>=(const valarray& v);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7853)

*Mandates*: The indicated operator can be applied to two operands of type T[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7857)

*Preconditions*: size() == v.size() is true[.](#2.sentence-1)

The value of an element in the left-hand side of a valarray compound
assignment operator does not depend on the value of another element in that left
hand side[.](#2.sentence-2)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7865)

*Effects*: Each of these operators
performs the indicated operation on each of the elements of *this and the
corresponding element of v[.](#3.sentence-1)

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7871)

*Returns*: *this[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7875)

*Remarks*: The appearance of an array on the left-hand side of a compound assignment
does not invalidate references or pointers[.](#5.sentence-1)

[🔗](#lib:operator*=,valarray_)

`valarray& operator*= (const T& v);
valarray& operator/= (const T& v);
valarray& operator%= (const T& v);
valarray& operator+= (const T& v);
valarray& operator-= (const T& v);
valarray& operator^= (const T& v);
valarray& operator&= (const T& v);
valarray& operator|= (const T& v);
valarray& operator<<=(const T& v);
valarray& operator>>=(const T& v);
`

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7905)

*Mandates*: The indicated operator can be applied to two operands of type T[.](#6.sentence-1)

[7](#7)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7909)

*Effects*: Each of these operators applies the indicated operation to each element
of *this and v[.](#7.sentence-1)

[8](#8)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7914)

*Returns*: *this[.](#8.sentence-1)

[9](#9)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L7918)

*Remarks*: The appearance of an array on the left-hand side of a compound assignment
does not
invalidate references or pointers to the elements of the array[.](#9.sentence-1)