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[template.gslice.array]
# 29 Numerics library [[numerics]](./#numerics)
## 29.6 Numeric arrays [[numarray]](numarray#template.gslice.array)
### 29.6.7 Class template gslice_array [template.gslice.array]
#### [29.6.7.1](#overview) Overview [[template.gslice.array.overview]](template.gslice.array.overview)
[🔗](#lib:gslice_array)
namespace std {template<class T> class gslice_array {public:using value_type = T; void operator= (const valarray<T>&) const; void operator*= (const valarray<T>&) const; void operator/= (const valarray<T>&) const; void operator%= (const valarray<T>&) const; void operator+= (const valarray<T>&) const; void operator-= (const valarray<T>&) const; void operator^= (const valarray<T>&) const; void operator&= (const valarray<T>&) const; void operator|= (const valarray<T>&) const; void operator<<=(const valarray<T>&) const; void operator>>=(const valarray<T>&) const;
gslice_array(const gslice_array&); ~gslice_array(); const gslice_array& operator=(const gslice_array&) const; void operator=(const T&) const;
gslice_array() = delete; // as implied by declaring copy constructor above};}
[1](#overview-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8786)
This template is a helper template used by thegslice subscript operator
[🔗](#lib:gslice_array_)
`gslice_array<T> valarray<T>::operator[](const gslice&);
`
[2](#overview-2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8796)
It has reference semantics to a subset of an array specified by agslice object[.](#overview-2.sentence-1)
Thus, the expressiona[gslice(1, length, stride)] = b has the effect of assigning the elements ofb to a
generalized slice of the elements ina[.](#overview-2.sentence-2)
#### [29.6.7.2](#gslice.array.assign) Assignment [[gslice.array.assign]](gslice.array.assign)
[🔗](#lib:operator=,gslice_array)
`void operator=(const valarray<T>&) const;
const gslice_array& operator=(const gslice_array&) const;
`
[1](#gslice.array.assign-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8817)
These assignment operators have reference semantics, assigning the values
of the argument array elements to selected elements of thevalarray<T> object to which thegslice_array refers[.](#gslice.array.assign-1.sentence-1)
#### [29.6.7.3](#gslice.array.comp.assign) Compound assignment [[gslice.array.comp.assign]](gslice.array.comp.assign)
[🔗](#lib:operator*=,gslice_array)
`void operator*= (const valarray<T>&) const;
void operator/= (const valarray<T>&) const;
void operator%= (const valarray<T>&) const;
void operator+= (const valarray<T>&) const;
void operator-= (const valarray<T>&) const;
void operator^= (const valarray<T>&) const;
void operator&= (const valarray<T>&) const;
void operator|= (const valarray<T>&) const;
void operator<<=(const valarray<T>&) const;
void operator>>=(const valarray<T>&) const;
`
[1](#gslice.array.comp.assign-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8852)
These compound assignments have reference semantics, applying the
indicated operation to the elements of the argument array and selected
elements of thevalarray<T> object to which thegslice_array object refers[.](#gslice.array.comp.assign-1.sentence-1)
#### [29.6.7.4](#gslice.array.fill) Fill function [[gslice.array.fill]](gslice.array.fill)
[🔗](#lib:operator=,gslice_array_)
`void operator=(const T&) const;
`
[1](#gslice.array.fill-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8870)
This function has reference semantics, assigning the value of its argument
to the elements of thevalarray<T> object to which thegslice_array object refers[.](#gslice.array.fill-1.sentence-1)

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[template.gslice.array.overview]
# 29 Numerics library [[numerics]](./#numerics)
## 29.6 Numeric arrays [[numarray]](numarray#template.gslice.array.overview)
### 29.6.7 Class template gslice_array [[template.gslice.array]](template.gslice.array#overview)
#### 29.6.7.1 Overview [template.gslice.array.overview]
[🔗](#lib:gslice_array)
namespace std {template<class T> class gslice_array {public:using value_type = T; void operator= (const valarray<T>&) const; void operator*= (const valarray<T>&) const; void operator/= (const valarray<T>&) const; void operator%= (const valarray<T>&) const; void operator+= (const valarray<T>&) const; void operator-= (const valarray<T>&) const; void operator^= (const valarray<T>&) const; void operator&= (const valarray<T>&) const; void operator|= (const valarray<T>&) const; void operator<<=(const valarray<T>&) const; void operator>>=(const valarray<T>&) const;
gslice_array(const gslice_array&); ~gslice_array(); const gslice_array& operator=(const gslice_array&) const; void operator=(const T&) const;
gslice_array() = delete; // as implied by declaring copy constructor above};}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8786)
This template is a helper template used by thegslice subscript operator
[🔗](#lib:gslice_array_)
`gslice_array<T> valarray<T>::operator[](const gslice&);
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8796)
It has reference semantics to a subset of an array specified by agslice object[.](#2.sentence-1)
Thus, the expressiona[gslice(1, length, stride)] = b has the effect of assigning the elements ofb to a
generalized slice of the elements ina[.](#2.sentence-2)