PNP: PNP0f13
c
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Ž // The template and inlines for the -*- C++ -*- gslice class.
// Copyright (C) 1997-2013 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// .
/** @file bits/gslice.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{valarray}
*/
// Written by Gabriel Dos Reis
#ifndef _GSLICE_H
#define _GSLICE_H 1
#pragma GCC system_header
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup numeric_arrays
* @{
*/
/**
* @brief Class defining multi-dimensional subset of an array.
*
* The slice class represents a multi-dimensional subset of an array,
* specified by three parameter sets: start offset, size array, and stride
* array. The start offset is the index of the first element of the array
* that is part of the subset. The size and stride array describe each
* dimension of the slice. Size is the number of elements in that
* dimension, and stride is the distance in the array between successive
* elements in that dimension. Each dimension's size and stride is taken
* to begin at an array element described by the previous dimension. The
* size array and stride array must be the same size.
*
* For example, if you have offset==3, stride[0]==11, size[1]==3,
* stride[1]==3, then slice[0,0]==array[3], slice[0,1]==array[6],
* slice[0,2]==array[9], slice[1,0]==array[14], slice[1,1]==array[17],
* slice[1,2]==array[20].
*/
class gslice
{
public:
/// Construct an empty slice.
gslice();
/**
* @brief Construct a slice.
*
* Constructs a slice with as many dimensions as the length of the @a l
* and @a s arrays.
*
* @param __o Offset in array of first element.
* @param __l Array of dimension lengths.
* @param __s Array of dimension strides between array elements.
*/
gslice(size_t __o, const valarray& __l,
const valarray& __s);
// XXX: the IS says the copy-ctor and copy-assignment operators are
// synthesized by the compiler but they are just unsuitable
// for a ref-counted semantic
/// Copy constructor.
gslice(const gslice&);
/// Destructor.
~gslice();
// XXX: See the note above.
/// Assignment operator.
gslice& operator=(const gslice&);
/// Return array offset of first slice element.
size_t start() const;
/// Return array of sizes of slice dimensions.
valarray size() const;
/// Return array of array strides for each dimension.
valarray stride() const;
private:
struc