[Rock-dev] typelib and std::vector

[Sylvain Joyeux]

On 01/26/2011 07:16 PM, Alexander Duda wrote:
> Hi
>
> how does typelib handle std::vectors when they are accessed from ruby?
> Are the following assumptions right?
>
> for std::vector<uint8_t>  or similar:
> my_vector.to_a --->  copies the vector into a ruby array
> my_vector[i] -->  not defined
> my_vector.each do |v| -->iterates over all fields without copying them
> my_vector.push s -->  pushes the sample to the back of the vector
> -->  How can I access a specific index without converting it to a ruby
> array?
I just pushed stuff to typelib master that implements random access on 
std::vector. That should work now.

> for std::vector<CompoundType>
> my_vector is converted automatically to a ruby array
It happens only if there is a conversion registered for a field of 
CompoundType, or for CompoundType itself.

For instance, if CompoundType was

   struct CompoundType
   {
     double a;
     double b;
   };

then no conversion to array would occur. Now, if CompoundType is


   struct CompoundType
   {
     base::Vector3d a;
     base::Vector3d b;
   };

then the conversion would occur, as base::Vector3d is represented in 
Ruby by Eigen::Vector3 (from base/ruby_types)
--
Sylvain Joyeux (Dr.Ing.)
Space & Security Robotics

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