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1 | // |
2 | // Boost.Pointer Container | |
3 | // | |
4 | // Copyright Thorsten Ottosen 2003-2005. Use, modification and | |
5 | // distribution is subject to the Boost Software License, Version | |
6 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | // | |
9 | // For more information, see http://www.boost.org/libs/ptr_container/ | |
10 | // | |
11 | ||
12 | #ifndef BOOST_PTR_CONTAINER_CLONE_ALLOCATOR_HPP | |
13 | #define BOOST_PTR_CONTAINER_CLONE_ALLOCATOR_HPP | |
14 | ||
15 | #include <boost/assert.hpp> | |
16 | #include <boost/checked_delete.hpp> | |
17 | #include <typeinfo> | |
18 | ||
19 | namespace boost | |
20 | { | |
21 | ///////////////////////////////////////////////////////////////////////// | |
22 | // Clonable concept | |
23 | ///////////////////////////////////////////////////////////////////////// | |
24 | ||
25 | template< class T > | |
26 | inline T* new_clone( const T& r ) | |
27 | { | |
28 | // | |
29 | // @remark: if you get a compile-error here, | |
30 | // it is most likely because you did not | |
31 | // define new_clone( const T& ) in the namespace | |
32 | // of T. | |
33 | // | |
34 | T* res = new T( r ); | |
35 | BOOST_ASSERT( typeid(r) == typeid(*res) && | |
36 | "Default new_clone() sliced object!" ); | |
37 | return res; | |
38 | } | |
39 | ||
40 | template< class T > | |
41 | inline T* new_clone( const T* r ) | |
42 | { | |
43 | return r ? new_clone( *r ) : 0; | |
44 | } | |
45 | ||
46 | // | |
47 | // @remark: to make new_clone() work | |
48 | // with scope_ptr/shared_ptr ect. | |
49 | // simply overload for those types | |
50 | // in the appropriate namespace. | |
51 | // | |
52 | ||
53 | template< class T > | |
54 | inline void delete_clone( const T* r ) | |
55 | { | |
56 | checked_delete( r ); | |
57 | } | |
58 | ||
59 | ///////////////////////////////////////////////////////////////////////// | |
60 | // CloneAllocator concept | |
61 | ///////////////////////////////////////////////////////////////////////// | |
62 | ||
63 | struct heap_clone_allocator | |
64 | { | |
65 | template< class U > | |
66 | static U* allocate_clone( const U& r ) | |
67 | { | |
68 | return new_clone( r ); | |
69 | } | |
70 | ||
71 | template< class U > | |
72 | static void deallocate_clone( const U* r ) | |
73 | { | |
74 | delete_clone( r ); | |
75 | } | |
76 | ||
77 | }; | |
78 | ||
79 | ||
80 | ||
81 | struct view_clone_allocator | |
82 | { | |
83 | template< class U > | |
84 | static U* allocate_clone( const U& r ) | |
85 | { | |
86 | return const_cast<U*>(&r); | |
87 | } | |
88 | ||
89 | template< class U > | |
90 | static void deallocate_clone( const U* /*r*/ ) | |
91 | { | |
92 | // do nothing | |
93 | } | |
94 | }; | |
95 | ||
96 | } // namespace 'boost' | |
97 | ||
98 | #endif | |
99 |