man std::mask_array (Fonctions bibliothèques) - Reference to selected subset of an array.

NAME

std::mask_array - Reference to selected subset of an array.

SYNOPSIS



#include <valarray>

Public Types

typedef Type value_type

Public Member Functions

mask_array (const mask_array &)

Copy constructor. Both slices refer to the same underlying array. mask_array & operator= (const mask_array &)

of a. void operator= (const valarray< Type > &) const

void operator *= (const valarray< Type > &) const

Multiply slice elements by corresponding elements of v. void operator/= (const valarray< Type > &) const

Divide slice elements by corresponding elements of v. void operator%= (const valarray< Type > &) const

Modulo slice elements by corresponding elements of v. void operator+= (const valarray< Type > &) const

Add corresponding elements of v to slice elements. void operator-= (const valarray< Type > &) const

Subtract corresponding elements of v from slice elements. void operator^= (const valarray< Type > &) const

Logical xor slice elements with corresponding elements of v. void operator &= (const valarray< Type > &) const

Logical and slice elements with corresponding elements of v. void operator|= (const valarray< Type > &) const

Logical or slice elements with corresponding elements of v. void operator<<= (const valarray< Type > &) const

Left shift slice elements by corresponding elements of v. void operator>>= (const valarray< Type > &) const

Right shift slice elements by corresponding elements of v. void operator= (const Type &) const

Assign all slice elements to t. template<class Dom> void operator= (const Expr< Dom, Type > &) const

template<typename Type> mask_array< Type > & operator= (const mask_array< Type > &a)

Private Member Functions

mask_array (Array< Type >, size_t, Array< bool >)

Private Attributes

const size_t M_sz

const Array< bool > M_mask

const Array< Type > M_array

Friends

class valarray< Type >

Detailed Description

template<class Type> class std::mask_array< Type >

Reference to selected subset of an array.

A mask_array is a reference to the actual elements of an array specified by a bitmask in the form of an array of bool. The way to get a mask_array is to call operator[](valarray<bool>) on a valarray. The returned mask_array then permits carrying operations out on the referenced subset of elements in the original valarray.

For example, if a mask_array is obtained using the array (false, true, false, true) as an argument, the mask array has two elements referring to array[1] and array[3] in the underlying array.

Parameters: Tp Element type.

Definition at line 61 of file valarray.

Constructor & Destructor Documentation

template<class Type> std::mask_array< Type >::mask_array (const mask_array< Type > &)

Copy constructor. Both slices refer to the same underlying array.

Member Function Documentation

template<class Type> void std::mask_array< Type >::operator &= (const valarray< Type > &) const

Logical and slice elements with corresponding elements of v.

template<class Type> void std::mask_array< Type >::operator *= (const valarray< Type > &) const

Multiply slice elements by corresponding elements of v.

template<class Type> void std::mask_array< Type >::operator%= (const valarray< Type > &) const

Modulo slice elements by corresponding elements of v.

template<class Type> void std::mask_array< Type >::operator+= (const valarray< Type > &) const

Add corresponding elements of v to slice elements.

template<class Type> void std::mask_array< Type >::operator-= (const valarray< Type > &) const

Subtract corresponding elements of v from slice elements.

template<class Type> void std::mask_array< Type >::operator/= (const valarray< Type > &) const

Divide slice elements by corresponding elements of v.

template<class Type> void std::mask_array< Type >::operator<<= (const valarray< Type > &) const

Left shift slice elements by corresponding elements of v.

template<typename Type> void std::mask_array< Type >::operator= (const Type &) const [inline]

Assign all slice elements to t.

Definition at line 158 of file valarray.

References std::__valarray_fill().

template<class Type> mask_array& std::mask_array< Type >::operator= (const mask_array< Type > &)

of a.

template<class Type> void std::mask_array< Type >::operator>>= (const valarray< Type > &) const

Right shift slice elements by corresponding elements of v.

template<class Type> void std::mask_array< Type >::operator^= (const valarray< Type > &) const

Logical xor slice elements with corresponding elements of v.

template<class Type> void std::mask_array< Type >::operator|= (const valarray< Type > &) const

Logical or slice elements with corresponding elements of v.

Author

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