Instigate Open Source Documentation

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src/generic/_assignable.hpp

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/*
 * Copyright © 2008-2010 Instigate CJSC, Armenia
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _INSTIGATE_OPEN_SOURCE_INTERNAL_HEADER_IN_CONCEPT
#error This is an internal header file used to implement Instigate Open Source.\
        It should never be included directly by a program.
#endif

#ifndef INSTIGATE_GENERIC_ASSIGNABLE_HPP
#define INSTIGATE_GENERIC_ASSIGNABLE_HPP

// Headers from this project

// Headers from other project

// Headers from standard libraries
#include <new>

// Forward declarations
namespace instigate {
        namespace generic {
                namespace assignable {
                        struct tag;
                        template <typename T> struct interface;
                        template <typename T> struct requirements;
                }
        }
}

struct instigate::generic::assignable::tag
{
};

template<typename T>
struct instigate::generic::assignable::interface
{
        static void assign(T& a, const T& b)
        {
                a = b;
        }
        
        static T* copy_constructor(char* const p, const T& ob)
        {
                return ::new (static_cast<void*>(p)) T(ob);
        }
};

template<typename T>
struct instigate::generic::assignable::requirements
{
private:
        static void require_assign(T& a, const T& b)
        {
                instigate::generic::assignable::interface<T>::assign(a, b);
        }

        static void require_copy_constructor(char* p, const T& ob)
        {
                instigate::generic::assignable::interface<T>
                                                ::copy_constructor(p, ob);
        }

public:
        requirements()
        {
                (void)require_assign;
                (void)require_copy_constructor;
        }

private:
        requirements(const requirements&) throw();

        requirements& operator=(const requirements&) throw();
};


// vim:et:tabstop=8:shiftwidth=8:cindent:fo=croq:textwidth=80:

#endif // INSTIGATE_GENERIC_ASSIGNABLE_HPP

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