While on the subject of vectors, can one do derivatives, like curl, divergence of a vector field, etc., & vector cross-product, etc., as in Blitz++? I ask since there's a relationship between multi_array & blitz++ according to
http://www.boost.org/doc/libs/1_48_0/libs/multi_array/doc/user.html

On Dec 29, 2011, at 3:48 AM, Ion Gaztañaga wrote:

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
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