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 | |
100 | |