---

CVME.h

Go to the documentation of this file.

/*
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
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*/
/*
  \class CVME
  \file CVME.h

  Encapsulates a CVME object. CVMEs purpose for existence is so that
  CVMEptr's wont cause memory leaks. A CVME contains a reference counted
  pointer which points to a CVMEptr object which holds the actual mapped
  address and performs the actual reads and writes. When a CVME is
  constructed, its reference count is incremented, and when one is
  destructed, its reference count is decremented. When the reference count
  falls to zero, the object is deleted. This way, the object wont be
  deleted before we are done with it.

  Author:
     Jason Venema
     NSCL
     Michigan State University
     East Lansing, MI 48824-1321
     mailto: venemaja@msu.edu
*/

#ifndef __CVME_H
#define __CVME_H

#ifndef __CVMEPTR_H
#include <CVMEptr.h>
#endif

#ifndef __REFPTR_H
#include <Refptr.h>
#endif

template<class T>
class CVME
{
  CRefcountedPtr<CVMEptr<T> > m_pRCptr;  // a reference counted pointer to the
                                         // CVMEptr which holds the mapping.

 public:
  // Enumeration of possible Vme devices to access
  enum VmeSpace {
    a16d16,
    a24d16,
    a24d32,
    a32d32
  };

  // Default constructor
  CVME<T>(VmeSpace space, UInt_t base, UInt_t length);
  CVME<T>();
  CVME<T>(CVMEptr<T>& aCVMEptr);
  // Copy constructor
  CVME<T>(const CVME& aCVME);
  // Operator= assignment operator
  CVME<T>& operator= (const CVME<T>& aCVME);

  // Operator== equality operator
  int operator== (const CVME<T>& aCVME) const
    {
      CVME<T>& t((CVME<T>&) *this);
      CVME<T>& r((CVME<T>& )aCVME);
      return (t.m_pRCptr == r.m_pRCptr);
    }

  // Mutator functions
 protected:
  void setRCptr(CVMEptr<T> aRCptr) { m_pRCptr = aRCptr; }

  // Public accessor functions
 public:
  UInt_t getOffset() { return m_pRCptr.operator*().getOffset(); }
  UInt_t getLength() { return m_pRCptr.operator*().getLength(); }
  Address_t getStart() { return m_pRCptr.operator*().getStart(); }
  Address_t getgenptr(UInt_t nOffset);

  // Public member functions
 public:
  // Pointer dereference/indexing
  T& operator*();
  T* operator->();
  T& operator[] (UInt_t nOffset);
  T& operator[] (UInt_t nOffset) const;

  // Pointer addition/subtraction
  CVME<T>& operator+(UInt_t nOffset);
  CVME<T>& operator-(UInt_t nOffset);
  CVME<T>& operator+=(UInt_t nOffset);
  CVME<T>& operator-=(UInt_t nOffset);

  // Pointer pre-increment/decrement
  CVME<T>& operator++();
  CVME<T>& operator--();

  // Pointer post-increment/decrement
  CVME<T>& operator++(Int_t);
  CVME<T>& operator--(Int_t);

  // Type conversion operators
 public:
  CVME<UChar_t> asChar();
  CVME<UShort_t> asShort();
  CVME<ULong_t> asLong();
};

#endif

/*
  \fn CVME<T>::CVME<T>(VmeSpace space, UInt_t base, UInt_t length)

  Operation Type:
     Constructor

  Purpose:
     Construct a CVME<T> by newing into existence a 
     CVMEptr<T> and encapsulating it in a RefcountedPtr.
  
  \param VmeSpace space - indicates the vme device to map
         UInt_t base    - the base address of the module
         UInt_t length  - the length of the mapping (bytes)
 */
template<class T>
CVME<T>::CVME<T>(VmeSpace space, UInt_t base, UInt_t length)
{
  CRefcountedPtr<CVMEptr<T> > p(new CVMEptr<T>(space, base, length));
  m_pRCptr = p;
}

/*
  \fn CVME<T>::CVME<T>()

  Operation Type:
     Constructor

  Purpose:
     Construct a CVME<T> which points to nothing.
*/
template<class T>
CVME<T>::CVME<T>()
{
  m_pRCptr = 0;
}

/*
  CVME<T>::CVME<T>(CVMEptr<T>& aCVMEptr)

  Operation Type:
     Constructor

  Purpose:
     Constructs an object of type CVME<T> given a CVMEptr object.

  \param CVMEptr<T>& aCVMEptr - the CVMEptr from which to construct this
*/
template<class T>
CVME<T>::CVME<T>(CVMEptr<T>& aCVMEptr)
{
  m_pRCptr = CRefcountedPtr<CVMEptr<T> >(aCVMEptr);
}

/*
  \fn CVME<T>::CVME<T>(const CVME<T>& aCVME)

  Operation Type:
     Copy Constructor

  Purpose:
     Construct a CVME<T> by copying one.
*/
template<class T>
CVME<T>::CVME<T>(const CVME<T>& aCVME)
{
  m_pRCptr = aCVME.m_pRCptr;
}

/*
  \fn CVME<T>& CVME<T>::operator=(const CVME<T>& aCVME)

  Operation Type:
     Assignment

  Purpose:
     Assign another CVME to this
*/
template<class T>
CVME<T>&
CVME<T>::operator=(const CVME<T>& aCVME)
{
  if(this == &aCVME) return *this;
  
  m_pRCptr = aCVME.m_pRCptr;
  return *this;
}

/*
  \fn T& CVME<T>::operator*()

  Operation Type:
     Pointer dereference

  Purpose:
     Returns the value stored by the encapsulated CVMEptr at its 
     current offset. Throws a CRangeError exception if it catches one.
*/
template<class T>
T&
CVME<T>::operator*()
{
  try {
    return m_pRCptr.operator*().operator*();
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn T* CVME<T>::operator->()

  Operation Type:
     Pointer dereference

  Purpose:
     Returns a pointer to the value stored by the encapsulated CVMEptr at 
     its current offset. Throws a CRangeError exception if it catches one.
*/
template<class T>
T*
CVME<T>::operator->()
{
  try {
    return m_pRCptr.operator*().operator->();
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn T& CVME<T>::operator[](UInt_t nOffset)

  Operation Type:
     Indexing(read/write)

  Purpose:
     Returns the value stored in the encapsulated CVMEptr at
     index nOffset. Throws a CRangeError exception if it catches one.

  \param UInt_t nOffset - the offset at which the value is stored.
*/
template<class T>
T&
CVME<T>::operator[](UInt_t nOffset)
{
  try {
    return m_pRCptr.operator*().operator[](nOffset);
  }
  catch(CRangeError& re) { 
    throw re;
  }
}

/*
  \fn T& CVME<T>::operator[](UInt_t nOffset) const

  Operation Type:
     Indexing(read/write)

  Purpose:
     Returns the value stored in the encapsulated CVMEptr at
     index nOffset. Throws a CRangeError exception if it catches one.

  \param UInt_t nOffset - the offset at which the value is stored.
*/
template<class T>
T&
CVME<T>::operator[](UInt_t nOffset) const
{
  try {
    return m_pRCptr.operator*().operator[](nOffset);
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn CVME<T>& CVME<T>::operator+(UInt_t nOffset)

  Operation Type:
     Mutator

  Purpose:
     Add a value to the encapsulated CVMEptr<T>'s current
     offset. Returns the new 'pointer' or throws a CRangeError
     exception if it catches one.

  \param UInt_t nOffset - the value to add to the current offset
*/
template<class T>
CVME<T>&
CVME<T>::operator+(UInt_t nOffset)
{
  try {
    m_pRCptr.operator*().operator+(nOffset);
  }
  catch(CRangeError& re) {
    throw re;
  }
  return *this;
}

/*
  \fn CVME<T>& CVME<T>::operator-(UInt_t nOffset)

  Operation Type:
     Mutator

  Purpose:
     Subtracts a value from the encapsulated CVMEptr<T>'s current
     offset. Returns the new 'pointer' or throws a CRangeError
     exception if it catches one.

  \param UInt_t nOffset - the value to add to the current offset
*/
template<class T>
CVME<T>&
CVME<T>::operator-(UInt_t nOffset)
{
  try {
    m_pRCptr.operator*().operator-(nOffset);
  }
  catch(CRangeError& re) {
    throw re;
  }
  return *this;
}

/*
  \fn CVME<T>& CVME<T>::operator+=(UInt_t nOffset)

  Operation Type:
     Mutator

  Purpose:
     Add a value to the encapsulated CVMEptr<T>'s current
     offset. Returns the new 'pointer' or throws a CRangeError
     exception if it catches one.

  \param UInt_t nOffset - the value to add to the current offset
*/
template<class T>
CVME<T>&
CVME<T>::operator+=(UInt_t nOffset)
{
  try {
    m_pRCptr.operator*().operator+=(nOffset);
    return *this;
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn CVME<T>& CVME<T>::operator-=(UInt_t nOffset)

  Operation Type:
     Mutator

  Purpose:
     Subtracts a value from the encapsulated CVMEptr<T>'s current
     offset. Returns the new 'pointer' or throws a CRangeError
     exception if it catches one.

  \param UInt_t nOffset - the value to add to the current offset
*/
template<class T>
CVME<T>&
CVME<T>::operator-=(UInt_t nOffset)
{
  try {
    m_pRCptr.operator*().operator-=(nOffset);
    return *this;
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn CVME<T>& CVME<T>::operator++()

  Operation Type:
     Mutator

  Purpose:
     (Pre)Increment the current offset into the encapsulated CVME<T>.
     Throws a CRangeError exception if it catches one.
*/
template<class T>
CVME<T>&
CVME<T>::operator++()
{
  try {
    m_pRCptr.operator*().operator++();
    return *this;
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn CVME<T>& CVME<T>::operator--()

  Operation Type:
     Mutator

  Purpose:
     (Pre)Decrement the current offset into the encapsulated CVME<T>.
     Throws a CRangeError exception if it catches one.
*/
template<class T>
CVME<T>&
CVME<T>::operator--()
{
  try {
    m_pRCptr.operator*().operator--();
    return *this;
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn CVME<T>& CVME<T>::operator++(Int_t n)

  Operation Type:
     Mutator

  Purpose:
     (Post)Increment the current offset into the encapsulated CVME<T>.
     Throws a CRangeError exception if it catches one.

  \param Int_t n - dummy parameter to indicate this is a 
                   post-increment operator.
*/
template<class T>
CVME<T>&
CVME<T>::operator++(Int_t n)
{
  try {
    m_pRCptr.operator*().operator++(n);
    return *this;
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn CVME<T>& CVME<T>::operator--(Int_t n)

  Operation Type:
     Mutator

  Purpose:
     (Post)Decrement the current offset into the encapsulated CVME<T>.
     Throws a CRangeError exception if it catches one.

  \param Int_t n - dummy parameter to indicate this is a 
                   post-decrement operator.
*/
template<class T>
CVME<T>&
CVME<T>::operator--(Int_t n)
{
  try {
    m_pRCptr.operator*().operator--(n);
    return *this;
  }
  catch(CRangeError& re) {
    throw re;
  }
}

/*
  \fn Address_t CVME<T>::getgenptr(UInt_t nOffset)

  Operation Type:
     Selector

  Purpose:
     Return a pointer to the current address+offset into the module
     (via the encapsulated CVMEptr<T>).

  \param UInt_t nOffset - an offset to use to determine the pointer
 */
template<class T>
Address_t
CVME<T>::getgenptr(UInt_t nOffset)
{
  Address_t p = m_pRCptr.operator*().getgenptr(nOffset);
  if(p) return p;
  else return (Address_t)-1;
}

/*
  \fn CVME<UChar_t> CVME<T>::asChar()

  Operation Type:
     Type conversion operator

  Purpose:
     Returns this as a CVME which maps m_pStart to an address space
     containing data of type UChar_t.
*/
template<class T>
CVME<UChar_t>
CVME<T>::asChar()
{
  //CVME<UChar_t> c(m_pRCptr->asChar());
  //return c;
  return CVME<UChar_t>(m_pRCptr->asChar());
}

/*
  \fn CVME<UShort_t> CVME<T>::asShort()

  Operation Type:
     Type conversion operator

  Purpose:
     Returns this as a CVME which maps m_pStart to an address space
     containing data of type UShort_t.
*/
template<class T>
CVME<UShort_t>
CVME<T>::asShort()
{
  return CVME<UShort_t>(m_pRCptr->asShort());
}

/*
  \fn CVME<ULong_t> CVME<T>::asLong()

  Operation Type:
     Type conversion operator

  Purpose:
     Returns this as a CVME which maps m_pStart to an address space
     containing data of type ULong_t.
*/
template<class T>
CVME<ULong_t>
CVME<T>::asLong()
{
  return CVME<ULong_t>(m_pRCptr->asLong());
}

---