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126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
// Copyright 2002 The Trustees of Indiana University.
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Boost.MultiArray Library
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// Authors: Ronald Garcia
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// Jeremy Siek
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// Andrew Lumsdaine
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// See http://www.boost.org/libs/multi_array for documentation.
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#ifndef BOOST_STORAGE_ORDER_RG071801_HPP
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#define BOOST_STORAGE_ORDER_RG071801_HPP
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#include "boost/multi_array/types.hpp"
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#include "boost/array.hpp"
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#include "boost/multi_array/algorithm.hpp"
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#include <algorithm>
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#include <cstddef>
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#include <functional>
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#include <numeric>
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#include <vector>
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namespace boost {
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// RG - This is to make things work with VC++. So sad, so sad.
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class c_storage_order;
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class fortran_storage_order;
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template <std::size_t NumDims>
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class general_storage_order
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{
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public:
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typedef detail::multi_array::size_type size_type;
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template <typename OrderingIter, typename AscendingIter>
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general_storage_order(OrderingIter ordering,
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AscendingIter ascending) {
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boost::detail::multi_array::copy_n(ordering,NumDims,ordering_.begin());
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boost::detail::multi_array::copy_n(ascending,NumDims,ascending_.begin());
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}
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// RG - ideally these would not be necessary, but some compilers
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// don't like template conversion operators. I suspect that not
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// too many folk will feel the need to use customized
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// storage_order objects, I sacrifice that feature for compiler support.
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general_storage_order(const c_storage_order&) {
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for (size_type i=0; i != NumDims; ++i) {
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ordering_[i] = NumDims - 1 - i;
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}
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ascending_.assign(true);
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}
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general_storage_order(const fortran_storage_order&) {
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for (size_type i=0; i != NumDims; ++i) {
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ordering_[i] = i;
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}
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ascending_.assign(true);
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}
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size_type ordering(size_type dim) const { return ordering_[dim]; }
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bool ascending(size_type dim) const { return ascending_[dim]; }
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bool all_dims_ascending() const {
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return std::accumulate(ascending_.begin(),ascending_.end(),true,
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std::logical_and<bool>());
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}
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bool operator==(general_storage_order const& rhs) const {
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return (ordering_ == rhs.ordering_) &&
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(ascending_ == rhs.ascending_);
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}
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protected:
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boost::array<size_type,NumDims> ordering_;
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boost::array<bool,NumDims> ascending_;
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};
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class c_storage_order
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{
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typedef detail::multi_array::size_type size_type;
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public:
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// This is the idiom for creating your own custom storage orders.
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// Not supported by all compilers though!
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#ifndef __MWERKS__ // Metrowerks screams "ambiguity!"
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template <std::size_t NumDims>
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operator general_storage_order<NumDims>() const {
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boost::array<size_type,NumDims> ordering;
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boost::array<bool,NumDims> ascending;
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for (size_type i=0; i != NumDims; ++i) {
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ordering[i] = NumDims - 1 - i;
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ascending[i] = true;
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}
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return general_storage_order<NumDims>(ordering.begin(),
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ascending.begin());
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}
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#endif
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};
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class fortran_storage_order
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{
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typedef detail::multi_array::size_type size_type;
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public:
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// This is the idiom for creating your own custom storage orders.
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// Not supported by all compilers though!
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#ifndef __MWERKS__ // Metrowerks screams "ambiguity!"
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template <std::size_t NumDims>
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operator general_storage_order<NumDims>() const {
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boost::array<size_type,NumDims> ordering;
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boost::array<bool,NumDims> ascending;
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for (size_type i=0; i != NumDims; ++i) {
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ordering[i] = i;
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ascending[i] = true;
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}
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return general_storage_order<NumDims>(ordering.begin(),
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ascending.begin());
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}
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#endif
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};
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} // namespace boost
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#endif // BOOST_ARRAY_STORAGE_RG071801_HPP
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