26 Numerics library [numerics]

26.7 Numeric arrays [numarray]

26.7.7 Class template gslice_­array [template.gslice.array]

26.7.7.1 Overview [template.gslice.array.overview]

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
#
This template is a helper template used by the gslice subscript operator
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gslice_array<T> valarray<T>::operator[](const gslice&);
2
#
It has reference semantics to a subset of an array specified by a gslice object.
Thus, the expression a[gslice(1, length, stride)] = b has the effect of assigning the elements of b to a generalized slice of the elements in a.

26.7.7.2 Assignment [gslice.array.assign]

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void operator=(const valarray<T>&) const; const gslice_array& operator=(const gslice_array&) const;
1
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These assignment operators have reference semantics, assigning the values of the argument array elements to selected elements of the valarray<T> object to which the gslice_­array refers.

26.7.7.3 Compound assignment [gslice.array.comp.assign]

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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
#
These compound assignments have reference semantics, applying the indicated operation to the elements of the argument array and selected elements of the valarray<T> object to which the gslice_­array object refers.

26.7.7.4 Fill function [gslice.array.fill]

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void operator=(const T&) const;
1
#
This function has reference semantics, assigning the value of its argument to the elements of the valarray<T> object to which the gslice_­array object refers.