+++ /dev/null
-#ifndef STLPLUS_SMART_PTR\r
-#define STLPLUS_SMART_PTR\r
-////////////////////////////////////////////////////////////////////////////////\r
-\r
-// Author: Andy Rushton\r
-// Copyright: (c) Southampton University 1999-2004\r
-// (c) Andy Rushton 2004-2009\r
-// License: BSD License, see ../docs/license.html\r
-\r
-// A smart pointer is a memory-managing pointer to an object. If you like, it\r
-// is a zero-dimensional container. \r
-\r
-// Assignment of smart pointers result in multiple aliases of the same object.\r
-// The term alias is used to differentiate from conventional pointers because\r
-// the semantics are different.\r
-\r
-// Aliases can be turned into copies if the pointed-to class supports copying.\r
-\r
-// The base class is smart_ptr_base which defines the common interface. Then\r
-// there are three subclasses which have the same interface but different copy\r
-// semantics:\r
-\r
-// - smart_ptr for simple types and classes which have copy constructors\r
-// - smart_ptr_clone for polymorphic class hierarchies which are copied using a clone method\r
-// - smart_ptr_nocopy for any class that cannot or should not be copied\r
-\r
-////////////////////////////////////////////////////////////////////////////////\r
-#include "containers_fixes.hpp"\r
-#include "exceptions.hpp"\r
-#include <map>\r
-#include <string>\r
-\r
-namespace stlplus\r
-{\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
- // internals\r
-\r
- template<typename T> class smart_ptr_holder;\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
- // Base class\r
- ////////////////////////////////////////////////////////////////////////////////\r
-\r
- template<typename T, typename C>\r
- class smart_ptr_base\r
- {\r
- public:\r
- //////////////////////////////////////////////////////////////////////////////\r
- // member type definitions\r
-\r
- typedef T value_type;\r
- typedef T& reference;\r
- typedef const T& const_reference;\r
- typedef C value_copy;\r
-\r
- //////////////////////////////////////////////////////////////////////////////\r
- // constructors and destructors\r
-\r
- // create a null pointer\r
- smart_ptr_base(void);\r
-\r
- // create a pointer containing a *copy* of the object using the template parameter C\r
- // this copy is taken because the pointer class maintains a dynamically allocated object \r
- // and the T& may not be (usually is not) dynamically allocated\r
- explicit smart_ptr_base(const T& data) throw(illegal_copy);\r
-\r
- // create a pointer containing a dynamically created object\r
- // Note: the object must be allocated *by the user* with new\r
- // constructor form - must be called in the form smart_ptr_base<type> x(new type(args))\r
- explicit smart_ptr_base(T* data);\r
-\r
- // copy constructor implements aliasing so no copy is made\r
- explicit smart_ptr_base(const smart_ptr_base<T,C>& r);\r
-\r
- // destructor decrements the reference count and delete only when the last reference is destroyed\r
- ~smart_ptr_base(void);\r
-\r
- //////////////////////////////////////////////////////////////////////////////\r
- // logical tests to see if there is anything contained in the pointer since it can be null\r
-\r
- // there are two forms:explicit and implicit\r
- // implicit: if(!r) or if(r)\r
- // explicit: if(r.null()) or if(r.present())\r
- operator bool(void) const;\r
- bool operator!(void) const;\r
- bool present(void) const;\r
- bool null(void) const;\r
-\r
- //////////////////////////////////////////////////////////////////////////////\r
- // dereference operators and functions\r
-\r
- // dereference the smart pointer to get the object - use in the form *p1\r
- T& operator*(void) throw(null_dereference);\r
- const T& operator*(void) const throw(null_dereference);\r
-\r
- // used as a prefix to a member access to the contained object e.g. p1->print() calls T::print()\r
- T* operator->(void) throw(null_dereference);\r
- const T* operator->(void) const throw(null_dereference);\r
-\r
- //////////////////////////////////////////////////////////////////////////////\r
- // explicit function forms of the above assignment and dereference operators\r
-\r
- // set the value - note that this does a copy using the C template parameter\r
- void set_value(const T& data) throw(illegal_copy);\r
- // get the value\r
- T& value(void) throw(null_dereference);\r
- const T& value(void) const throw(null_dereference);\r
-\r
- // set the pointer\r
- // deletes the previous pointer and adopts the passed pointer instead\r
- // Note: the object must be allocated *by the user* with new\r
- // Warning: it is very easy to break the memory management with this operation\r
- void set(T* data = 0);\r
- // get the pointer\r
- T* pointer(void);\r
- const T* pointer(void) const;\r
-\r
- //////////////////////////////////////////////////////////////////////////////\r
- // functions to manage aliases\r
-\r
- // make this an alias of the passed object\r
- void alias(const smart_ptr_base<T,C>&);\r
-\r
- // test whether two pointers point to the same object(known as aliasing the object)\r
- // used in the form if(a.aliases(b))\r
- bool aliases(const smart_ptr_base<T,C>&) const;\r
-\r
- // find the number of aliases - used when you need to know whether an\r
- // object is still referred to from elsewhere (rare!)\r
- unsigned alias_count(void) const;\r
-\r
- // delete the object and make the pointer null - does not make it unique\r
- // first, so all other pointers to this will be null too\r
- void clear(void);\r
-\r
- // make the pointer unique and null in one step - does not affect other\r
- // pointers that were pointing to the same object\r
- void clear_unique(void);\r
-\r
- //////////////////////////////////////////////////////////////////////////////\r
- // functions that involve copying\r
-\r
- // these functions use the copy functor passed as the template parameter C\r
- // to copy the object with the right copy semantics. If the copy functor\r
- // is no_copy, an exception will be thrown.\r
-\r
- // make this pointer unique with respect to any other references to the same object\r
- // if this pointer is already unique, it does nothing - otherwise it copies the object\r
- void make_unique(void) throw(illegal_copy);\r
-\r
- // make this pointer a unique copy of the parameter\r
- // useful for expressions like p1.copy(p2) which makes p1 a pointer to a unique copy of the contents of p2\r
- void copy(const smart_ptr_base<T,C>&) throw(illegal_copy);\r
-\r
- protected:\r
- smart_ptr_holder<T>* m_holder;\r
-\r
- public:\r
- // internal use only - had to make them public because they need to be\r
- // accessed by routines that could not be made friends\r
- void* handle(void) const;\r
- void make_alias(void* handle);\r
- };\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
- // copy functors implementing the three possible copy semantics\r
-\r
- // constructor_copy uses the copy constructor of the object - used for simple types\r
-\r
- template <typename T>\r
- class constructor_copy\r
- {\r
- public:\r
- T* operator() (const T& from) throw()\r
- {\r
- return new T(from);\r
- }\r
- };\r
-\r
- // clone_copy uses the clone method of the object - used for polymorphic types\r
-\r
- template <typename T>\r
- class clone_copy\r
- {\r
- public:\r
- T* operator() (const T& from) throw()\r
- {\r
- return from.clone();\r
- }\r
- };\r
-\r
- // no_copy throws an exception - used for types that cannot be copied\r
-\r
- template <typename T>\r
- class no_copy\r
- {\r
- public:\r
- T* operator() (const T& from) throw(illegal_copy)\r
- {\r
- throw illegal_copy("no_copy functor called");\r
- return 0;\r
- }\r
- };\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
- // smart_ptr for simple types and classes which have copy constructors\r
-\r
- template <typename T>\r
- class smart_ptr : public smart_ptr_base<T, constructor_copy<T> >\r
- {\r
- public:\r
- smart_ptr(void) {}\r
- explicit smart_ptr(const T& data) : smart_ptr_base<T, constructor_copy<T> >(data) {}\r
- explicit smart_ptr(T* data) : smart_ptr_base<T, constructor_copy<T> >(data) {}\r
- smart_ptr<T>& operator=(const T& data) {set_value(data); return *this;}\r
- smart_ptr<T>& operator=(const smart_ptr<T>& r) {alias(r); return *this;}\r
- ~smart_ptr(void) {}\r
- };\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
- // smart_ptr_clone for polymorphic class hierarchies which have a clone method\r
-\r
- template <typename T>\r
- class smart_ptr_clone : public smart_ptr_base<T, clone_copy<T> >\r
- {\r
- public:\r
- smart_ptr_clone(void) {}\r
- explicit smart_ptr_clone(const T& data) : smart_ptr_base<T, clone_copy<T> >(data) {}\r
- explicit smart_ptr_clone(T* data) : smart_ptr_base<T, clone_copy<T> >(data) {}\r
- smart_ptr_clone<T>& operator=(const T& data) {set_value(data); return *this;}\r
- smart_ptr_clone<T>& operator=(const smart_ptr_clone<T>& r) {alias(r); return *this;}\r
- ~smart_ptr_clone(void) {}\r
- };\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
- // smart_ptr_nocopy for any class that cannot or should not be copied\r
-\r
- template <typename T>\r
- class smart_ptr_nocopy : public smart_ptr_base<T, no_copy<T> >\r
- {\r
- public:\r
- smart_ptr_nocopy(void) {}\r
- explicit smart_ptr_nocopy(const T& data) : smart_ptr_base<T, no_copy<T> >(data) {}\r
- explicit smart_ptr_nocopy(T* data) : smart_ptr_base<T, no_copy<T> >(data) {}\r
- smart_ptr_nocopy<T>& operator=(const T& data) {set_value(data); return *this;}\r
- smart_ptr_nocopy<T>& operator=(const smart_ptr_nocopy<T>& r) {alias(r); return *this;}\r
- ~smart_ptr_nocopy(void) {}\r
- };\r
-\r
- ////////////////////////////////////////////////////////////////////////////////\r
-\r
-} // end namespace stlplus\r
-\r
-#include "smart_ptr.tpp"\r
-#endif\r
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