[template.indirect.array.overview] (original) (raw)

29 Numerics library [numerics]

29.6 Numeric arrays [numarray]

29.6.9 Class template indirect_array [template.indirect.array]

29.6.9.1 Overview [template.indirect.array.overview]

namespace std { template<class T> class indirect_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; indirect_array(const indirect_array&);~indirect_array();const indirect_array& operator=(const indirect_array&) const;void operator=(const T&) const; indirect_array() = delete; };}

This template is a helper template used by the indirect subscript operator

indirect_array<T> valarray<T>::operator[](const valarray<size_t>&);

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

Thus, the expressiona[​indirect] = b;has the effect of assigning the elements ofbto the elements inawhose indices appear inindirect.