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#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/unordered_map.hpp> //boost::unordered_map
#include <functional> //std::equal_to
#include <boost/functional/hash.hpp> //boost::hash
int main ()
{
using namespace boost::interprocess;
//Erase previous shared memory with the name
shared_memory_object::remove("MySharedMemory");
try{
//Create shared memory
managed_shared_memory segment(create_only ,"MySharedMemory" ,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
( 3, boost::hash<int>(), std::equal_to<int>() //
, segment.get_allocator<ValueType>()); //allocator instance
//Insert data in the hash map
for(int i = 0; i < 100; ++i){
myhashmap->insert(ValueType(i, (float)i));
}
}
catch(...){
shared_memory_object::remove("MySharedMemory");
throw;
}
shared_memory_object::remove("MySharedMemory");
return 0;
}