ReferenceCountedBuffer.h

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/*
    This software is Copyright by the Board of Trustees of Michigan
    State University (c) Copyright 2017.
 
    You may use this software under the terms of the GNU public license
    (GPL).  The terms of this license are described at:
 
     http://www.gnu.org/licenses/gpl.txt
 
     Authors:
             Ron Fox
             Giordano Cerriza
         NSCL
         Michigan State University
         East Lansing, MI 48824-1321
*/
 
#ifndef REFERENCECOUNTEDBUFFER_H
#define REFERENCECOUNTEDBUFFER_H
 
#include <stddef.h>
#include <stdint.h>
 
namespace DDASReadout {
 
    struct ReferenceCountedBuffer
    {
    size_t s_size;       
    size_t s_references; 
    void*  s_pData;      
 
    ReferenceCountedBuffer(size_t initialSize = 0);
    virtual ~ReferenceCountedBuffer();
    
    // Reference count management:
 
    void reference();
    void dereference();
    bool isReferenced();
    
    // Other:
 
    void resize(size_t newSize);
    
    // Syntactical sugar for the most common casts; still nothing to stop
    // someone from mytyp* p = static_cast<mytyp*>(somebuffer.s_pData);
    
    operator uint8_t*()  { return static_cast<uint8_t*>(s_pData); }
    operator uint16_t*() { return static_cast<uint16_t*>(s_pData); }
    operator uint32_t*() { return static_cast<uint32_t*>(s_pData); }
    };
 
} // Namespace
 
#endif