concepts.hpp

C++的一个好库。。。现在很流行

//
//  Copyright (c) 2000-2002
//  Joerg Walter, Mathias Koch
//
//  Permission to use, copy, modify, distribute and sell this software
//  and its documentation for any purpose is hereby granted without fee,
//  provided that the above copyright notice appear in all copies and
//  that both that copyright notice and this permission notice appear
//  in supporting documentation.  The authors make no representations
//  about the suitability of this software for any purpose.
//  It is provided "as is" without express or implied warranty.
//
//  The authors gratefully acknowledge the support of
//  GeNeSys mbH & Co. KG in producing this work.
//

#ifndef _BOOST_UBLAS_CONCEPTS_
#define _BOOST_UBLAS_CONCEPTS_

#include <boost/concept_check.hpp>

// Concept checks based on ideas of Jeremy Siek

namespace boost { namespace numeric { namespace ublas {


    template<class T>
    struct AssignableConcept {
        typedef T value_type;

        static void constraints (value_type t) {
            // Copy Constructor
            value_type c1 (t);
            value_type c2 = t;
            // Assignment
            value_type a = t;
            std::swap (c1, c2);
            ignore_unused_variable_warning (a);
        }
    };

    template<class T>
    struct EqualityComparableConcept {
        typedef T value_type;

        static void constraints (const value_type t) {
            bool b;
            // Equality
            b = t == t;
            // Inequality
            b = t != t;
            ignore_unused_variable_warning (b);
        }
    };

    template<class T>
    struct LessThanComparableConcept {
        typedef T value_type;

        static void constraints (const value_type t) {
            bool b;
            b = t < t;
            b = t <= t;
            b = t >= t;
            b = t > t;
            ignore_unused_variable_warning (b);
        }
    };

    template<class T>
    struct DefaultConstructibleConcept {
        typedef T value_type;

        static void constraints () {
            // Default Constructor
            static value_type c1 = value_type ();
            static value_type c2;
            ignore_unused_variable_warning (c1);
            ignore_unused_variable_warning (c2);
        }
    };

    template<class I, class T = typename std::iterator_traits<I>::value_type>
    struct BidirectionalIteratorConcept {
        typedef I iterator_type;
        
        typedef typename std::iterator_traits<I>::iterator_category iterator_category;
        typedef typename std::iterator_traits<I>::difference_type difference_type;
        typedef typename std::iterator_traits<I>::value_type value_type;
        typedef typename std::iterator_traits<I>::reference reference;
        typedef typename std::iterator_traits<I>::pointer pointer;

        static void constraints () {
            AssignableConcept<iterator_type>::constraints (iterator_type ());
            EqualityComparableConcept<iterator_type>::constraints (iterator_type ());
            DefaultConstructibleConcept<iterator_type>::constraints ();
            iterator_type it = iterator_type ();

            // Associated types - assume constructable
            iterator_category c;
            difference_type d (0);
            pointer p (0);
            // Dereference
            reference r (*it);
            value_type t (r);
            // Member access
            // FIXME it->m;
            // Preincrement
            ++ it;
            // Postincrement
            it ++;
            // Predecrement
            -- it;
            // Postdecrement
            it --;
            ignore_unused_variable_warning (t);
            ignore_unused_variable_warning (c);
            ignore_unused_variable_warning (d);
            ignore_unused_variable_warning (p);
            ignore_unused_variable_warning (r);
        }
    };

    template<class I, class T = typename std::iterator_traits<I>::value_type>
    struct MutableBidirectionalIteratorConcept {
        typedef I iterator_type;
        typedef T value_type;

        static void constraints () {
            BidirectionalIteratorConcept<iterator_type, value_type>::constraints ();
            iterator_type it = iterator_type ();
            value_type t = value_type ();
            // Dereference assignment
            *it = t;
            ignore_unused_variable_warning (t);
        }
    };

    template<class I, class D = typename std::iterator_traits<I>::difference_type, class T = typename std::iterator_traits<I>::value_type>
    struct RandomAccessIteratorConcept {
        typedef I iterator_type;
        typedef D difference_type;
        typedef T value_type;

        static void constraints () {
            LessThanComparableConcept<iterator_type>::constraints (iterator_type ());
            BidirectionalIteratorConcept<iterator_type, value_type>::constraints ();
            iterator_type it = iterator_type (), it1 = iterator_type (), it2 = iterator_type ();
            difference_type n (0);
            value_type t;
            // Forward motion
            it += n;
            // Iterator addition
            it = it + n;
            iterator_type itp (it + n);
            // Backward motion
            it -= n;
            // Iterator subtraction
            it = it - n;
            iterator_type itm (it - n);
            // Difference
            n = it1 - it2;
            // Element operator
#ifdef BOOST_UBLAS_ITERATOR_IS_INDEXABLE
            t = it [n];
#endif
            t = *(it + n);
            ignore_unused_variable_warning (itp);
            ignore_unused_variable_warning (itm);
            ignore_unused_variable_warning (t);
        }
    };

    template<class I, class D = typename std::iterator_traits<I>::difference_type, class T = typename std::iterator_traits<I>::value_type>
    struct MutableRandomAccessIteratorConcept {
        typedef I iterator_type;
        typedef D difference_type;
        typedef T value_type;

        static void constraints () {
            MutableBidirectionalIteratorConcept<iterator_type, value_type>::constraints ();
            RandomAccessIteratorConcept<iterator_type, difference_type, value_type>::constraints ();
            iterator_type it = iterator_type ();
            difference_type n (0);
            value_type t = value_type ();
            // Element assignment
#ifdef BOOST_UBLAS_ITERATOR_IS_INDEXABLE
            it [n] = t;
#endif
            *(it + n) = t;
        }
    };

    template<class I>
    struct Indexed1DIteratorConcept {
        typedef I iterator_type;

        static void constraints () {
            iterator_type it = iterator_type ();
            // Index
            it.index ();
        }
    };

    template<class I>
    struct IndexedBidirectional1DIteratorConcept {
        typedef I iterator_type;

        static void constraints () {
            BidirectionalIteratorConcept<iterator_type>::constraints ();
            Indexed1DIteratorConcept<iterator_type>::constraints ();
        }
    };

    template<class I>
    struct MutableIndexedBidirectional1DIteratorConcept {
        typedef I iterator_type;

        static void constraints () {
            MutableBidirectionalIteratorConcept<iterator_type>::constraints ();
            Indexed1DIteratorConcept<iterator_type>::constraints ();
        }
    };

    template<class I>
    struct IndexedRandomAccess1DIteratorConcept {
        typedef I iterator_type;

        static void constraints () {
            RandomAccessIteratorConcept<iterator_type>::constraints ();
            Indexed1DIteratorConcept<iterator_type>::constraints ();
        }
    };

    template<class I>
    struct MutableIndexedRandomAccess1DIteratorConcept {
        typedef I iterator_type;

        static void constraints () {
            MutableRandomAccessIteratorConcept<iterator_type>::constraints ();
            Indexed1DIteratorConcept<iterator_type>::constraints ();
        }
    };

    template<class I>
    struct Indexed2DIteratorConcept {
        typedef I iterator_type;
        typedef typename I::dual_iterator_type dual_iterator_type;
        typedef typename I::dual_reverse_iterator_type dual_reverse_iterator_type;

        static void constraints () {
            iterator_type it = iterator_type ();
            // Indices
            it.index1 ();
            it.index2 ();
            // Iterator begin/end
            dual_iterator_type it_begin (it.begin ());
            dual_iterator_type it_end (it.end ());
            // Reverse iterator begin/end
            dual_reverse_iterator_type it_rbegin (it.rbegin ());
            dual_reverse_iterator_type it_rend (it.rend ());
            ignore_unused_variable_warning (it_begin);
            ignore_unused_variable_warning (it_end);
            ignore_unused_variable_warning (it_rbegin);
            ignore_unused_variable_warning (it_rend);
        }
    };

    template<class I1, class I2>
    struct IndexedBidirectional2DIteratorConcept {
        typedef I1 subiterator1_type;
        typedef I2 subiterator2_type;

        static void constraints () {
            BidirectionalIteratorConcept<subiterator1_type>::constraints ();
            BidirectionalIteratorConcept<subiterator2_type>::constraints ();
            Indexed2DIteratorConcept<subiterator1_type>::constraints ();
            Indexed2DIteratorConcept<subiterator2_type>::constraints ();
        }
    };

    template<class I1, class I2>
    struct MutableIndexedBidirectional2DIteratorConcept {
        typedef I1 subiterator1_type;
        typedef I2 subiterator2_type;

        static void constraints () {
            MutableBidirectionalIteratorConcept<subiterator1_type>::constraints ();
            MutableBidirectionalIteratorConcept<subiterator2_type>::constraints ();
            Indexed2DIteratorConcept<subiterator1_type>::constraints ();
            Indexed2DIteratorConcept<subiterator2_type>::constraints ();
        }
    };

    template<class I1, class I2>