Hi Aida,
What I understand from your email is that you have a global
variable with predefined size, like this:
float radius[6];
I can recommend you some hints, based on my experience:
- To use a dynamic vector, I recommend you to use the class
std::vector. It allows you to change the size dynamically.
- I also recommend you not to use global variables. Global
variables, in general is not a good option because it's difficult to trace
who changes them and to understand the code.
- If you are using C++, use classes and member variables. For
example a class called Cylinder. Then use smart pointer to pass instances of
the class between functions. This will prevent you to have memory leaks. For
example if you have a filter that uses a cylinder to compute the volume, I
recommend you to use a class called CylinderVolumeComputation that has a
function called SetCylinder(). This function will store a pointer to the
input cylinder. Another function called Update() will perform the
computation of the volume. Finally a third function called GetVolume() will
retrieve the volume value.
- Finally I recommend you to use XML format to read/write your
information. XML format it's a standard text format that the files can be
shared easily with other applications. There's a library called TinyXML in
GIMIAS to read/write XML.
I hope this can help you.
Best,
Xavi
From: Aida Ninyerola [mailto:[email protected]]
Sent: viernes, 25 de noviembre de 2011 11:56
To: [email protected]
Subject: [Gimias-developers] generic vector size
Hi,
During my process I need to create a certain number of cylinders. The
information related to the radius, height and position of the cylinders is
contained in a ".txt" file. I am able to read this file and create the
cylinders but I need to put in the code the number of cylinders I am going
to create.
I would like to introduce also the number of cylinders in the ".txt" file
because in this way, if the user decides to change this number, it won't be
necessary to compile the code in order to apply the changes.
The problem appears when I need to work with the vectors that contain the
radius, height and position information. The dimension of these vectros
deppens on the number of cylinders. These vectors are global variables
because I need to use them in more than one function, so they are defined in
the header file where I need to specify their dimension. I don't know if it
is possible to achieve what I want.
Thank you very much!
Aida
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