26 Numerics library [numerics]

26.6 Numeric arrays [numarray]

26.6.7 Class template gslice_array [template.gslice.array]

26.6.7.1 Class template gslice_array overview [template.gslice.array.overview]

namespace std {
  template <class T> class gslice_array {
  public:
    typedef T value_type;

    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 slice subscript operator

gslice_array<T> valarray<T>::operator[](const gslice&);

2

It has reference semantics to a subset of an array specified by a gslice object.

3

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.

26.6.7.2 gslice_array assignment [gslice.array.assign]

void operator=(const valarray<T>&) const; const gslice_array& operator=(const gslice_array&) const;

1

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.

26.6.7.3 gslice_array [gslice.array.comp.assign]

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 computed 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.

26.6.7.4 gslice_array fill function [gslice.array.fill]

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.