Re: [Boost-users] Boost interprocess vector, creating multiple vector pointers

Subject: Re: [Boost-users] Boost interprocess vector, creating multiple vector pointers
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2011-12-29 04:48:52

El 28/12/2011 9:30, Prasanth Madhavan escribió:
> I want to insert a shared vector into a shared map using the following
> code: managed_shared_memory segment(create_only ,"MySharedMemory"
> ,65536);
> typedef allocator<int, managed_shared_memory::segment_manager>
> vecAllocator;typedef vector<int, vecAllocator>  vec;typedef
> std::pair<int, vec*>  ValueType;typedef allocator<ValueType,
> managed_shared_memory::segment_manager>  ShmemAllocator;typedef
> multimap<int, vec*, std::less<int>, ShmemAllocator>  MyMap;
> ShmemAllocator alloc_inst (segment.get_segment_manager());vecAllocator
> vectorallocator (segment.get_segment_manager());
>
> MyMap *mymap = segment.construct<MyMap>("MyMap")(std::less<int>(),alloc_inst);vec
> *myvec = segment.construct<vec>("myvec")(vectorallocator);vec *myvec1
> = segment.construct<vec>("myvec1")(vectorallocator);
> myvec->push_back(10);myvec->push_back(9);myvec->push_back(8);myvec1->push_back(987);myvec1->push_back(123);myvec1->push_back(456);
>
> for(int i = 0; i<  6; ++i){    for(int j = 0; j<6; j++)
> mymap->insert(std::pair<int, vec*>(i, myvec));}for(int i = 0; i<  6;
> ++i){    for(int j = 0; j<6; j++)        mymap->insert(std::pair<int,
> vec*>(i, myvec1));}the code works.. but what i want to do is construct
> a vector without a name. that is do something like this
> vec *myvec = segment.construct<vec>(vectorallocator);vec *myvec1 =
> segment.construct<vec>(vectorallocator);so that if i put it inside a
> loop and there is no problem with naming them differently every loop.
> Is there a way to do so? Or atleast is there an automatic way to name
> them differently every loop?

You should use anonymous allocation:

http://www.boost.org/doc/libs/1_48_0/doc/html/interprocess/managed_memory_segments.html#interprocess.managed_memory_segments.managed_memory_segment_features.anonymous

best,

Ion