cppdraft_translate/cppdraft/template/slice/array.md

[template.slice.array]

29 Numerics library [numerics]

29.6 Numeric arrays [numarray]

29.6.5 Class template slice_array [template.slice.array]

29.6.5.1 Overview [template.slice.array.overview]

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namespace std {template class slice_array {public:using value_type = T; void operator= (const valarray&) const; void operator*= (const valarray&) const; void operator/= (const valarray&) const; void operator%= (const valarray&) const; void operator+= (const valarray&) const; void operator-= (const valarray&) const; void operator^= (const valarray&) const; void operator&= (const valarray&) const; void operator|= (const valarray&) const; void operator<<=(const valarray&) const; void operator>>=(const valarray&) const;

slice_array(const slice_array&); ~slice_array(); const slice_array& operator=(const slice_array&) const; void operator=(const T&) const;

slice_array() = delete; // as implied by declaring copy constructor above};}

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This template is a helper template used by theslice subscript operatorslice_array valarray::operator;

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

[Example 1:

The expressiona[slice(1, 5, 3)] = b; has the effect of assigning the elements ofb to a slice of the elements ina.

For the slice shown, the elements selected froma are 1,4,…,13.

— end example]

29.6.5.2 Assignment [slice.arr.assign]

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

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These assignment operators have reference semantics, assigning the values of the argument array elements to selected elements of thevalarray object to which theslice_array object refers.

29.6.5.3 Compound assignment [slice.arr.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;

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These compound assignments have reference semantics, applying the indicated operation to the elements of the argument array and selected elements of thevalarray object to which theslice_array object refers.

29.6.5.4 Fill function [slice.arr.fill]

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void operator=(const T&) const;

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This function has reference semantics, assigning the value of its argument to the elements of thevalarray object to which theslice_array object refers.