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|
/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// TAO
//
// = FILENAME
// sequence_T.h
//
// = AUTHOR
// Carlos O'Ryan and Aniruddha Gokhale
//
// ============================================================================
#ifndef TAO_SEQUENCE_T_H
#define TAO_SEQUENCE_T_H
template <class T>
class TAO_Unbounded_Sequence : public TAO_Unbounded_Base_Sequence
{
// = TITLE
// Parametrized implementation of IDL unbounded sequences.
//
// = DESCRIPTION
// This class completes the implementation for TAO_Base_Sequence
// for the unbounded case.
public:
// = Initialization and termination methods.
TAO_Unbounded_Sequence (void);
// Default constructor.
TAO_Unbounded_Sequence (CORBA::ULong max);
// Constructor using a maximum length value.
TAO_Unbounded_Sequence (CORBA::ULong max,
CORBA::ULong length,
T *data,
CORBA::Boolean release = 0);
// Constructor using the data and memory management flag. Memory
// *must* be allocated using the ::allocbuf static method, since in
// the future this classes may use a global ACE_Allocator.
TAO_Unbounded_Sequence (const TAO_Unbounded_Sequence<T> &);
// Copy constructor.
TAO_Unbounded_Sequence<T> &operator= (const TAO_Unbounded_Sequence<T> &);
// Assignment operator.
~TAO_Unbounded_Sequence (void);
// Dtor.
// = Accessors.
T &operator[] (CORBA::ULong);
// operator []
const T &operator[] (CORBA::ULong) const;
// operator []
// = Static operations.
static T *allocbuf (CORBA::ULong);
// Allocate storage for the sequence.
static void freebuf (T *);
// Free the sequence.
virtual void _allocate_buffer (CORBA::ULong length);
virtual void _deallocate_buffer (void);
// Implement the TAO_Base_Sequence methods (see Sequence.h)
// = orbos/98-01-11 proposed extensions.
T *get_buffer (CORBA::Boolean orphan = 0);
// Allows read-write access to the underlying buffer. If <orphan>
// is FALSE the sequence returns a pointer to its buffer, allocating
// one if it has not yet done so. The number of elements in the
// buffer can be determined from the sequence <length> accessor.
//
// If the <orphan> argument to <get_buffer> is FALSE, the sequence
// maintains ownership of the underlying buffer. Elements in the
// returned buffer may be directly replaced by the caller. For
// sequences of strings, wide strings, and object references, the
// caller must use the sequence <release> accessor to determine
// whether elements should be freed (using <string_free>,
// <wstring_free>, or <CORBA::release> for strings, wide straings,
// and object references, respective) before being directly assigned
// to.
//
// If the <orphan> argument to <get_buffer> is TRUE, the sequence
// yields ownership of the buffer to the caller. If <orphan> is
// TRUE and the sequence does not own its buffer (i.e., its
// <release> flag is FALSE), the return value is a null pointer. If
// the buffer is taken from the sequence using this form of
// <get_buffer>, the sequence reverts to the same state it would
// have if constructed using its default constructor. The caller
// becomes responsible for eventually freeing each element of the
// returned buffer (for strings, wide string, and object
// references), and then freeing the returned buffer itself using
// <freebuf>.
const T *get_buffer (void) const;
// This function allows read-only access to the sequence buffer.
// The sequence returns its buffer, allocating one of one has not
// yet been allocated. No direct modification of the returned
// buffer by the caller is permitted.
void replace (CORBA::ULong max,
CORBA::ULong length,
T *data,
CORBA::Boolean release = 0);
// Allows the buffer underlying a sequence to be replaced. The
// parameters to <replace> are identical in type, order, and purpose
// to those for the <T *data> constructor for the sequence.
};
template <class T, CORBA::ULong MAX>
class TAO_Bounded_Sequence : public TAO_Bounded_Base_Sequence
{
// = TITLE
// Parametric bounded sequence.
//
// = DESCRIPTION
// This class completes the implementation for TAO_Base_Sequence
// for the bounded case.
public:
// = Initialization and termination methods.
TAO_Bounded_Sequence (void);
// Default constructor.
TAO_Bounded_Sequence (CORBA::ULong length,
T *data,
CORBA::Boolean release=0);
// Constructor using the data and memory management flag.
TAO_Bounded_Sequence (const TAO_Bounded_Sequence<T,MAX> &);
// Copy constructor.
TAO_Bounded_Sequence<T,MAX> &operator= (const TAO_Bounded_Sequence<T,MAX> &);
// Assignment operator.
~TAO_Bounded_Sequence (void);
// Dtor.
// = Accessors.
T &operator[] (CORBA::ULong);
// operator []
const T &operator[] (CORBA::ULong) const;
// operator []
// = Static operations.
static T *allocbuf (CORBA::ULong);
// Allocate storage for the sequence.
static void freebuf (T *);
// Free the sequence.
virtual void _allocate_buffer (CORBA::ULong length);
// allocate a buffer of the requested length. The buffer is allocated for the
// right type
virtual void _deallocate_buffer (void);
// deallocate the buffer
// = orbos/98-01-11 proposed extensions.
T *get_buffer (CORBA::Boolean orphan = 0);
// Allows read-write access to the underlying buffer. If <orphan>
// is FALSE the sequence returns a pointer to its buffer, allocating
// one if it has not yet done so. The size of the returned buffer
// is equal to the sequence bound, which can be determined with the
// <maximum> accessor. The number of elements in the buffer can be
// determined from the sequence <length> accessor.
//
// If the <orphan> argument to <get_buffer> is FALSE, the sequence
// maintains ownership of the underlying buffer. Elements in the
// returned buffer may be directly replaced by the caller. For
// sequences of strings, wide strings, and object references, the
// caller must use the sequence <release> accessor to determine
// whether elements should be freed (using <string_free>,
// <wstring_free>, or <CORBA::release> for strings, wide straings,
// and object references, respective) before being directly assigned
// to.
//
// If the <orphan> argument to <get_buffer> is TRUE, the sequence
// yields ownership of the buffer to the caller. If <orphan> is
// TRUE and the sequence does not own its buffer (i.e., its
// <release> flag is FALSE), the return value is a null pointer. If
// the buffer is taken from the sequence using this form of
// <get_buffer>, the sequence reverts to the same state it would
// have if constructed using its default constructor. The caller
// becomes responsible for eventually freeing each element of the
// returned buffer (for strings, wide string, and object
// references), and then freeing the returned buffer itself using
// <freebuf>.
const T *get_buffer (void) const;
// This function allows read-only access to the sequence buffer.
// The sequence returns its buffer, allocating one of one has not
// yet been allocated. No direct modification of the returned
// buffer by the caller is permitted.
void replace (CORBA::ULong max,
CORBA::ULong length,
T *data,
CORBA::Boolean release = 0);
// Allows the buffer underlying a sequence to be replaced. The
// parameters to <replace> are identical in type, order, and purpose
// to those for the <T *data> constructor for the sequence.
};
// *************************************************************
template<class T,class T_var> class TAO_Unbounded_Object_Sequence;
template<class T, class T_var, CORBA::ULong MAX> class TAO_Bounded_Object_Sequence;
template<CORBA::ULong MAX> class TAO_Bounded_String_Sequence;
// *************************************************************
template<class T,class T_var>
class TAO_Object_Manager
{
// = TITLE
// Manager for Objects.
//
// = DESCRIPTION
// The mapping for sequences of objects (and other pseudo objects)
// requires an auxiliar class or <Manager> to handle the reference
// count on the object, (a kind of smart pointer).
// The main difference with respect to T_var classes is that
// automatic release is not controlled on a per-item basis, but
// for the sequence as a whole.
// Further the class must implement "transparent" assignment into
// the sequence, for instance, operator[] returns a managed
// object, but:
//
// object_sequence[i] = foo;
//
// must change the state of the sequence.
//
// This class implements the generic object manager and is used to
// instantiate the proper sequence types.
//
// = NOTES
// It has been proposed that the class should be parametric on
// both T and T_ptr, IMHO this is no necesary: though the IDL spec
// says that T_ptr *could* map to a type different to T* in the
// particular case of TAO it does map to <T*>.
//
friend class TAO_Unbounded_Object_Sequence<T,T_var>;
public:
// @@ Use partial template specialization here to give access only
// to the right kind of sequence.
// friend template<CORBA::ULong MAX>
// class TAO_Bounded_Object_Sequence<T,MAX>;
// = Initialization and termination methods.
TAO_Object_Manager (const TAO_Object_Manager<T,T_var> &rhs);
// Copy constructor, the semantics are non-trivial:
// + The referenced element is duplicated or not according to the
// release value on the <rhs>.
// + In any case a new reference to the same object is created.
TAO_Object_Manager (T **, CORBA::Boolean release);
// Constructor from address of an element, it should be private and
// only TAO_*_Object_Sequence would use it, but we have some
// problems with friendship and templates.
~TAO_Object_Manager (void);
// Destructor, only releases the object if <release_> is true.
TAO_Object_Manager<T,T_var> &operator= (const TAO_Object_Manager<T,T_var> &rhs);
// Assignment from another managed type, only release if
// <this->release_> is true.
// @@ TODO what happens if rhs.release_ is true an this->relase_ is
// false?
TAO_Object_Manager<T,T_var> &operator= (T *);
// Assignment from T *.
TAO_Object_Manager<T,T_var> &operator= (T_var &);
// Assignment from T *.
T * operator-> (void) const;
// Return pointer.
operator const T *() const;
// Cast (read-only).
operator T *&();
// Cast.
T *in (void) const;
// for in parameter.
T *&inout (void);
// for inout parameter.
T *&out (void);
// for out parameter.
T *_retn (void);
// for return type
private:
T **ptr_;
// data member, notice that it is a pointer, to implement the
// reference behavior for assignment.
CORBA::Boolean release_;
// release flag based on parent's flag
};
// *************************************************************
template<class T,class T_var>
class TAO_Unbounded_Object_Sequence : public TAO_Unbounded_Base_Sequence
{
// = TITLE
// Parametric sequence for types that require managers.
//
// = DESCRIPTION
// Some IDL types require that sequences on them have a "manager"
// class, in charge of handling the object lifetime, examples are
// pseudo objects, object references and strings.
// = SPEC
// 16.8 Mapping for Structured Types
// The mapping for struct, union, and sequence (but not array) is a
// C++ struct or class with a default constructor, a copy
// constructor, an assignment operator, and a destructor.
//
public:
// = Initialization and termination methods.
TAO_Unbounded_Object_Sequence (void);
// {orbos/97-05-15:16.8}
// The default constructor initializes object reference members to
// appropriately typed nil object references and string members to
// NULL; all other members are initialized via their default
// constructors.
//
// {orbos/97-05-15:16.11}
// For both bounded and unbounded sequences, the default constructor
// (as shown in the example above) sets the sequence length equal to
// 0.
TAO_Unbounded_Object_Sequence (CORBA::ULong max);
// Unbounded sequences provide a constructor that allows only the
// initial value of the maximum length to be set (the ``maximum
// constructor'' shown in the example above). This allows
// applications to control how much buffer space is initially
// allocated by the sequence. This constructor also sets the length
// to 0 and the release flag to TRUE.
TAO_Unbounded_Object_Sequence (CORBA::ULong maximum,
CORBA::ULong length,
T* *data,
CORBA::Boolean release=0);
// The ``T *data'' constructor (as shown in the example above)
// allows the length and contents of a bounded or unbounded sequence
// to be set. For unbounded sequences, it also allows the initial
// value of the maximum length to be set. For this constructor,
// ownership of the contents vector is determined by the release
// parameter---FALSE means the caller owns the storage, while TRUE
// means that the sequence assumes ownership of the storage.
// If release is TRUE, the contents vector must have been allocated
// using the sequence allocbuf function, and the sequence will pass
// it to freebuf when finished with it.
TAO_Unbounded_Object_Sequence(const TAO_Unbounded_Object_Sequence<T,T_var> &);
// The copy constructor performs a deep copy from the existing
// structure to create a new structure, including calling _duplicate
// on all object reference members and performing the necessary
// heap allocations for all string members.
//
// The copy constructor creates a new sequence with the same maximum
// and length as the given sequence, copies each of its current
// elements (items zero through length-1), and sets the release
// flag to TRUE.
~TAO_Unbounded_Object_Sequence (void);
// The destructor releases all object reference memebrs and frees
// all string members.
TAO_Unbounded_Object_Sequence<T,T_var> &operator= (const TAO_Unbounded_Object_Sequence <T,T_var> &);
// The assignment operator first releases all object reference
// members and frees all string members, and then performs a
// deepcopy to create a new structure.
//
// The assignment operator deepcopies its parameter, releasing old
// storage if necessary. It behaves as if the original sequence is
// destroyed via its destructor and then the source sequence copied
// using the copy constructor. If release=TRUE, the destructor
// destroys each of the current elements (items zero through
// length--1). For an unbounded sequence, if a reallocation is
// necessary due to a change in the length and the sequence was
// created using the release=TRUE parameter in its constructor, the
// sequence will deallocate the old storage. If release is FALSE
// under these circumstances, old storage will not be freed before
// the reallocation is performed. After reallocation, the release
// flag is always set to TRUE.
TAO_Object_Manager<T,T_var> operator[] (CORBA::ULong slot) const;
// read-write accessor
static T **allocbuf (CORBA::ULong);
// The allocbuf function allocates a vector of T elements that can
// be passed to the T *data constructor. The length of the vector is
// given by the nelems function argument. The allocbuf function
// initializes each element using its default constructor, except
// for strings, which are initialized to null pointers, and object
// references, which are initialized to suitably typed nil object
// references. A null pointer is returned if allocbuf for some
// reason cannot allocate the requested vector. Vectors allocated by
// allocbuf should be freed using the freebuf function.
static void freebuf (T **);
// The freebuf function ensures that the destructor for each element
// is called before the buffer is destroyed, except for string
// elements, which are freed using string_free(), and object
// reference elements, which are freed using release(). The freebuf
// function will ignore null pointers passed to it.
// The Base_Sequence functions, please see "tao/Sequence.h"
virtual void _allocate_buffer (CORBA::ULong length);
virtual void _deallocate_buffer (void);
virtual void _shrink_buffer (CORBA::ULong new_length,
CORBA::ULong old_length);
virtual void _downcast (void* target,
CORBA_Object* src,
CORBA_Environment &ACE_TRY_ENV =
TAO_default_environment ());
// No default to workaround egcs problem with templates and
// namespaces
virtual CORBA_Object* _upcast (void* src) const;
};
// *************************************************************
template<class T, class T_var,CORBA::ULong MAX>
class TAO_Bounded_Object_Sequence : public TAO_Bounded_Base_Sequence
{
// = TITLE
// Parametric sequence for types that require managers.
//
// = DESCRIPTION
// Please see the documentation for the unbounded case.
//
public:
// = Initialization and termination methods.
TAO_Bounded_Object_Sequence (void);
// For bounded sequences, the maximum length is part of the type and
// cannot be set or modified, while for unbounded sequences, the
// default constructor also sets the maximum length to 0. The
// default constructor for a bounded sequence always allocates a
// contents vector, so it always sets the release flag to TRUE.
TAO_Bounded_Object_Sequence (CORBA::ULong length,
T* *value,
CORBA::Boolean release=0);
// Constructor from data.
TAO_Bounded_Object_Sequence (const TAO_Bounded_Object_Sequence<T,T_var,MAX> &);
// Copy constructor.
~TAO_Bounded_Object_Sequence (void);
// destructor
TAO_Bounded_Object_Sequence &operator= (const TAO_Bounded_Object_Sequence<T,T_var,MAX> &);
// Assignment from another Bounded sequence.
TAO_Object_Manager<T,T_var> operator[] (CORBA::ULong slot) const;
// Read-write accessor.
static T **allocbuf (CORBA::ULong length);
// Allocate storage for a sequence..
static void freebuf (T **buffer);
// Free a buffer allocated by allocbuf() and release each element on
// it.
// The Base_Sequence functions, please see "tao/sequence.h"
virtual void _allocate_buffer (CORBA::ULong length);
virtual void _deallocate_buffer (void);
virtual void _shrink_buffer (CORBA::ULong new_length,
CORBA::ULong old_length);
virtual void _downcast (void* target,
CORBA_Object* src,
CORBA_Environment &ACE_TRY_ENV =
TAO_default_environment ());
// No default to workaround egcs problem with templates and
// namespaces
virtual CORBA_Object* _upcast (void* src) const;
};
// *************************************************************
template<class T,class T_var>
class TAO_Unbounded_Pseudo_Sequence : public TAO_Unbounded_Base_Sequence
{
// = TITLE
// Parametric sequence for pseudo objects.
//
// = DESCRIPTION
// Some IDL types (including pseudo objects) require that
// sequences on them have a "manager" class, in charge of handling
// the object lifetime.
// This parametric class implements those sequences. In general
// the sequence is similar to Object_Sequente, except for some
// TAO internal details. The complete documentation of each method
// is provided in TAO_Unbounded_Object_Sequece
public:
// = Initialization and termination methods.
TAO_Unbounded_Pseudo_Sequence (void);
// default ctor
TAO_Unbounded_Pseudo_Sequence (CORBA::ULong max);
// Constructor with a "hint" for the maximum capacity.
TAO_Unbounded_Pseudo_Sequence (CORBA::ULong maximum,
CORBA::ULong length,
T* *data,
CORBA::Boolean release=0);
// Constructor with a given buffer.
TAO_Unbounded_Pseudo_Sequence(const TAO_Unbounded_Pseudo_Sequence<T,T_var> &);
// Copy ctor, deep copies.
~TAO_Unbounded_Pseudo_Sequence (void);
// dtor releases all the contained elements.
TAO_Unbounded_Pseudo_Sequence<T,T_var> &operator= (const TAO_Unbounded_Pseudo_Sequence <T,T_var> &);
// The assignment operator first releases all object reference
// members and frees all string members, and then performs a
// deepcopy to create a new structure.
TAO_Object_Manager<T,T_var> operator[] (CORBA::ULong slot) const;
// read-write accessor
static T **allocbuf (CORBA::ULong);
// The allocbuf function allocates a vector of T elements that can
// be passed to the T *data constructor.
static void freebuf (T **);
// Release all the elements.
// The Base_Sequence functions, please see "tao/Sequence.h"
virtual void _allocate_buffer (CORBA::ULong length);
virtual void _deallocate_buffer (void);
virtual void _shrink_buffer (CORBA::ULong new_length,
CORBA::ULong old_length);
};
// *************************************************************
template<class T, class T_var,CORBA::ULong MAX>
class TAO_Bounded_Pseudo_Sequence : public TAO_Bounded_Base_Sequence
{
// = TITLE
// Bounded version of TAO_Unbounded_Psuedo_Sequence.
//
// = DESCRIPTION
// Please see the documentation for the unbounded case.
//
public:
// = Initialization and termination methods.
TAO_Bounded_Pseudo_Sequence (void);
// default ctor.
TAO_Bounded_Pseudo_Sequence (CORBA::ULong length,
T* *value,
CORBA::Boolean release=0);
// Constructor from data.
TAO_Bounded_Pseudo_Sequence (const TAO_Bounded_Pseudo_Sequence<T,T_var,MAX> &);
// Copy constructor.
~TAO_Bounded_Pseudo_Sequence (void);
// destructor
TAO_Bounded_Pseudo_Sequence &operator= (const TAO_Bounded_Pseudo_Sequence<T,T_var,MAX> &);
// Assignment from another Bounded sequence.
TAO_Object_Manager<T,T_var> operator[] (CORBA::ULong slot) const;
// Read-write accessor.
static T **allocbuf (CORBA::ULong length);
// Allocate storage for a sequence..
static void freebuf (T **buffer);
// Free a buffer allocated by allocbuf() and release each element on
// it.
// The Base_Sequence functions, please see "tao/sequence.h"
virtual void _allocate_buffer (CORBA::ULong length);
virtual void _deallocate_buffer (void);
virtual void _shrink_buffer (CORBA::ULong new_length,
CORBA::ULong old_length);
};
// *************************************************************
template<CORBA::ULong MAX>
class TAO_Bounded_String_Sequence : public TAO_Bounded_Base_Sequence
{
// = TITLE
// Bounded sequence of strings.
//
// = DESCRIPTION
// As its unbounded counterpart it duplicates and releases strings
// (via CORBA::string_dup and CORBA::string_free) under the
// control of a per sequence flag, but the capacity of the
// sequence is bound on the type.
public:
TAO_Bounded_String_Sequence (void);
// {SPEC}
// For bounded sequences, the maximum length is part of the type and
// cannot be set or modified, while for unbounded sequences, the
// default constructor also sets the maximum length to 0. The
// default constructor for a bounded sequence always allocates a
// contents vector, so it always sets the release flag to TRUE.
TAO_Bounded_String_Sequence (CORBA::ULong length,
char* *value,
CORBA::Boolean release = 0);
// {SPEC}
// The ``T *data'' constructor (as shown in the example above)
// allows the length and contents of a bounded or unbounded sequence
// to be set. For unbounded sequences, it also allows the initial
// value of the maximum length to be set. For this constructor,
// ownership of the contents vector is determined by the release
// parameter---FALSE means the caller owns the storage, while TRUE
// means that the sequence assumes ownership of the storage.
//
// If release is TRUE, the contents vector must have been allocated
// using the sequence allocbuf function, and the sequence will pass
// it to freebuf when finished with it.
TAO_Bounded_String_Sequence (const TAO_Bounded_String_Sequence<MAX> &);
// {SPEC}
// Management Functions'' on page 16. The copy constructor creates a
// new sequence with the same maximum and length as the given
// sequence, copies each of its current elements (items zero through
// length--1), and sets the release flag to TRUE.
TAO_Bounded_String_Sequence &operator= (const TAO_Bounded_String_Sequence<MAX> &);
// {SPEC}
// The assignment operator deep copies its parameter, releasing
// old storage if necessary. It behaves as if the original sequence
// is destroyed via its destructor and then the source sequence
// copied using the copy constructor.
~TAO_Bounded_String_Sequence (void);
// {SPEC}
// If release=TRUE, the destructor destroys each of the current
// elements (items zero through length-1).
TAO_SeqElem_String_Manager operator[] (CORBA::ULong slot) const;
// read-write accessor
static char **allocbuf (CORBA::ULong length);
// {SPEC}
// The allocbuf function allocates a vector of T elements that can
// be passed to the T *data constructor. The length of the vector is
// given by the nelems function argument. The allocbuf function
// initializes each element using its default constructor, except
// for strings, which are initialized to null pointers, and object
// references, which are initialized to suitably typed nil object
// references. A null pointer is returned if allocbuf for some
// reason cannot allocate the requested vector. Vectors allocated by
// allocbuf should be freed using the freebuf function.
static void freebuf (char **buffer);
// {SPEC}
// The freebuf function ensures that the destructor for each element
// is called before the buffer is destroyed, except for string
// elements, which are freed using string_free(), and object
// reference elements, which are freed using release(). The freebuf
// function will ignore null pointers passed to it.
// @@ Please document me.
virtual void _allocate_buffer (CORBA::ULong length);
virtual void _deallocate_buffer (void);
virtual void _shrink_buffer (CORBA::ULong new_length,
CORBA::ULong old_length);
};
// *************************************************************
#if defined (__ACE_INLINE__)
#include "tao/Sequence_T.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "tao/Sequence_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Sequence_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* TAO_SEQUENCE_T_H */
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