[ublas] Special allocators

Subject: [ublas] Special allocators
From: Dominic Amann (dominic_at_[hidden])
Date: 2010-10-28 11:49:17

I am trying ublas for simple 3d transformations, but my objects are 
intended to be stored in global memory 
(boost::interprocess::managed_shared_memory). It seems needlessly 
complex to create a vector using a non-default allocator - it would seem 
I have to initialize a vector with another (stl) vector. Is the 
following correct?

namespace ipc = boot::interprocess;
namespace ublas = boost::numeric::ublas;

typedef ipc::managed_shared_memory::segment_manager    segment_manager_t;
typedef ipc::allocator<double, segment_manager_t>    double_allocator;
typedef ipc::vector<double, double_allocator>    shm_double_vector;
typedef ublas::vector<double, shm_double_vector>    XYZVector;

class MyClass {
     public:
         MyClass(const void_allocator& void_alloc) : _xtz_vector(4, 
shm_double_vector(4, 0.0, void_alloc)) {}
     private:
         XYZVector _xyz_vector;
};

Where I come unstuck (I think) is in the constructor initializer? Any 
help would be appreciated.