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Posted 1 Sep 2003

RAII Idiom and Managed C++

, 1 Sep 2003
A template wrapper that enables deterministic cleanup in .NET environment.
/*
Copyright (c) 2003, Nemanja Trifunovic
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.

The name of Nemanja Trifunovic may not be used to endorse or promote products
derived from this software without specific prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR 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.
*/

#pragma once

#include <vcclr.h>

//DisposeObject policy calls Dispose() function to clean up resources
template <typename T> class DisposeObject
    {
    protected:
        void Cleanup(T object) {object->Dispose();}
    };

//CloseObject policy calls Close() function to clean up resources
template <typename T> class CloseObject
    {
    protected:
        void Cleanup(T object) {object->Close();}
    };

/*
Template parameters:
T - a __gc pointer to object we want to wrap
CleanupPolicy - DisposeObject (default) or CloseObject
*/
template <typename T, template <typename> class CleanupPolicy = DisposeObject>
    class gc_scoped : protected CleanupPolicy<T>
    {
    gcroot <T> object_;

    // Non - copyable
    gc_scoped ( const gc_scoped& );
    gc_scoped& operator = ( const gc_scoped& );

    public:
        gc_scoped (const T& object): object_(object){}
        ~gc_scoped () 
            {
            Cleanup(object_);
            }
        T operator-> () const { return object_; }
    };

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About the Author

Nemanja Trifunovic
Software Developer (Senior) SAP
United States United States
Born in Kragujevac, Serbia. Now lives in Boston area with his wife and daughters.

Wrote his first program at the age of 13 on a Sinclair Spectrum, became a professional software developer after he graduated.

Very passionate about programming and software development in general.

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