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67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2007. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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//[doc_unordered_map
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/allocators/allocator.hpp>
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#include <boost/unordered_map.hpp> //boost::unordered_map
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#include <functional> //std::equal_to
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#include <boost/functional/hash.hpp> //boost::hash
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int main ()
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{
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using namespace boost::interprocess;
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//Erase previous shared memory with the name
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shared_memory_object::remove("MySharedMemory");
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try{
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//Create shared memory
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managed_shared_memory segment(create_only ,"MySharedMemory" ,65536);
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//Note that unordered_map<Key, MappedType>'s value_type is std::pair<const Key, MappedType>,
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//so the allocator must allocate that pair.
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typedef int KeyType;
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typedef float MappedType;
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typedef std::pair<const int, float> ValueType;
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//Typedef the allocator
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typedef allocator<ValueType, managed_shared_memory::segment_manager> ShmemAllocator;
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//Alias an unordered_map of ints that uses the previous STL-like allocator.
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typedef boost::unordered_map
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< KeyType , MappedType
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, boost::hash<KeyType> ,std::equal_to<KeyType>
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, ShmemAllocator>
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MyHashMap;
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//Construct a shared memory hash map.
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//Note that the first parameter is the initial bucket count and
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//after that, the hash function, the equality function and the allocator
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MyHashMap *myhashmap = segment.construct<MyHashMap>("MyHashMap") //object name
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( 3, boost::hash<int>(), std::equal_to<int>() //
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, segment.get_allocator<ValueType>()); //allocator instance
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//Insert data in the hash map
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for(int i = 0; i < 100; ++i){
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myhashmap->insert(ValueType(i, (float)i));
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}
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}
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catch(...){
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shared_memory_object::remove("MySharedMemory");
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throw;
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}
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shared_memory_object::remove("MySharedMemory");
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return 0;
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}
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//]
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#include <boost/interprocess/detail/config_end.hpp>
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