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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Based_Pointer_T.h
//
// = AUTHOR
// Dietrich Quehl <Dietrich.Quehl@med.siemens.de> and
// Douglas C. Schmidt <schmidt@.cs.wustl.edu>
//
// ============================================================================
#ifndef ACE_BASED_POINTER_T_H
#define ACE_BASED_POINTER_T_H
#if defined (_MSC_VER)
// Suppress warning e.g. "return type for
// 'ACE_Based_Pointer<long>::operator ->' is 'long *' (i.e., not a UDT
// or reference to a UDT. Will produce errors if applied using infix
// notation)"
#pragma warning(disable: 4284)
#endif /* _MSC_VER */
template <class CONCRETE>
class ACE_Based_Pointer
{
// = TITLE
// A proxy that keeps track of the relative offset of a "pointer"
// from its base address.
//
// = DESCRIPTION
// This class makes it possible to transparently use "pointers" in
// shared memory as easily as programming with pointers to local
// memory. In particular, we don't need to ensure that the base
// addresses of all the pointers are mapped into separate
// processes at the same absolute memory base address.
public:
// = Initialization method.
ACE_Based_Pointer (void);
// This constructor initializes the <base_offset_> by asking the
// <ACE_BASED_POINTER_REPOSITORY> Singleton for the base address of
// the memory region within which it is instantiated. Two results
// are possible:
//
// 1. An <ACE_*_Memory_Pool> has stored a base address/size pair and the
// new based-pointer instance is located between the base address and
// the base address + size - 1. In this case, the repository
// returns the base address.
//
// 2. No suitable address/size pair was found. The repository
// assumes an address in the regular (not mapped) virtual address
// space of the process and returns 0. In this case, the
// based-pointer uses its address as an offset to it's base
// address 0.
CONCRETE *operator->(void);
// The C++ "delegation operator".
CONCRETE *operator =(CONCRETE *from);
// Pseudo-assignment operator.
CONCRETE operator *(void);
// Dereference operator.
CONCRETE operator [](int index);
// Subscript operator.
private:
CONCRETE *target_;
long base_offset_;
// Keep track of our offset from the base pointer.
};
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Based_Pointer_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Based_Pointer_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_BASED_POINTER_T_H */
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