base.h

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//  base.h
//
//  Author: Eric Nivel
//
//  BSD license:
//  Copyright (c) 2010, Eric Nivel
//  All rights reserved.
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//
//   - Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//   - Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//   - Neither the name of Eric Nivel nor the
//     names of their contributors may be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
//  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//  DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
//  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
//  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
//  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
//  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef core_base_h
#define core_base_h

#include <cstdlib>
#include <atomic>
#include "dll.h"


namespace core {

class _Object;

// Smart pointer (ref counting, deallocates when ref count<=0).
// No circular refs (use std c++ ptrs).
// No passing in functions (cast P<C> into C*).
// Cannot be a value returned by a function (return C* instead).
template<class C> class P {
private:
    _Object *object;
public:
    P();
    P(C *o);
    P(const P<C> &p);
    ~P();
    C *operator ->() const;
    template<class D> operator D *() const {

        return (D *)object;
    }
    bool operator ==(C *c) const;
    bool operator !=(C *c) const;
    bool operator <(C *c) const;
    bool operator >(C *c) const;
    bool operator !() const;
    template<class D> bool operator ==(P<D> &p) const;
    template<class D> bool operator !=(P<D> &p) const;
    P<C> &operator =(C *c);
    P<C> &operator =(const P<C> &p);
    template<class D> P<C> &operator =(const P<D> &p);
};


// Root smart-pointable object class.
class core_dll _Object {
    template<class C> friend class P;
    friend class _P;
protected:
    std::atomic_int_fast64_t refCount;
    _Object();
public:
    virtual ~_Object();
    void incRef();
    virtual void decRef();
};

}


#include "base.tpl.cpp"


#endif