1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#include <boost/interprocess/detail/workaround.hpp>
#if BOOST_CXX_VERSION >=201103L
//[doc_unordered_map
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
//<-
//Shield against external warnings
#include <boost/interprocess/detail/config_external_begin.hpp>
//->
#include <boost/unordered_map.hpp> //boost::unordered_map
//<-
#include <boost/interprocess/detail/config_external_end.hpp>
#include "../test/get_process_id_name.hpp"
//->
#include <functional> //std::equal_to
#include <boost/container_hash/hash.hpp> //boost::hash
//<-
#include "../test/get_process_id_name.hpp"
//->
int main ()
{
using namespace boost::interprocess;
//Remove shared memory on construction and destruction
struct shm_remove
{
shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
} remover;
//<-
(void)remover;
//->
//Create shared memory
managed_shared_memory segment(create_only, test::get_process_id_name(), 65536);
//Note that unordered_map<Key, MappedType>'s value_type is std::pair<const Key, MappedType>,
//so the allocator must allocate that pair.
typedef int KeyType;
typedef float MappedType;
typedef std::pair<const int, float> ValueType;
//Typedef the allocator
typedef allocator<ValueType, managed_shared_memory::segment_manager> ShmemAllocator;
//Alias an unordered_map of ints that uses the previous STL-like allocator.
typedef boost::unordered_map
< KeyType , MappedType
, boost::hash<KeyType> ,std::equal_to<KeyType>
, ShmemAllocator>
MyHashMap;
//Construct a shared memory hash map.
//Note that the first parameter is the initial bucket count and
//after that, the hash function, the equality function and the allocator
MyHashMap *myhashmap = segment.construct<MyHashMap>("MyHashMap") //object name
( 3u, boost::hash<int>(), std::equal_to<int>() //
, segment.get_allocator<ValueType>()); //allocator instance
//Insert data in the hash map
for(std::size_t i = 0; i < 100u; ++i){
myhashmap->insert(ValueType((int)i, (float)i));
}
return 0;
}
//]
#else
int main()
{
return 0;
}
#endif //#if BOOST_CXX_VERSION >=201103L
|
