[Developers] Help on traits

[Steve Martell]

Hola Mark,

I'm not clear on what your objective with this example is, but if I'm right in assuming that your trying to write a growth function that is robust to the permutations of the different arguments, then you might be better of writing a class template.  With a class you can overload the constructor such that a number of different combinations could be accommodated.

Steve


On Jul 19, 2014, at 10:18 AM, dave fournier <davef at otter-rsch.com<mailto:davef at otter-rsch.com>> wrote:

On 07/14/2014 01:02 PM, Mark Maunder wrote:

Hi,

I think you are confusing two things here.  One is to have a single function vonB
which acts on different types in the same way. In this case the code needs to depend on the types.

Note that in your code it is assumed that age is a vector

inline
typename Growthvectortrait<T>::GrowthvectorT vonBertalanffy(const T &Linf, const T &K, const T &t0, const T1 &age)
{
        typedef typename Growthvectortrait<T>::GrowthvectorT vonBT;

        vonBT len;
        cout << "HERE" << endl;

        len.allocate(age.indexmin(),age.indexmax());
        len.initialize();

        for(int i = len.indexmin(); i <= len.indexmax(); i++ )
        {
          len(i) = Linf*(1.-mfexp(-K*(age(i)-t0)));
        }
        return len;
}

I think you have to specialize for when age is a number like this.

template <typename T>
inline
dvariable vonBertalanffy(const T &Linf, const T &K, const T &t0, double &age)
{

  dvariable len;
  cout << "HERE1" << endl;
  len = Linf*(1.-mfexp(-K*(age-t0)));
  return len;
}

The original traits examples were for doing the same thing to the passed objects on the
generated code level.  So I'm not exactly sure what yoiu are trying to accomplish here.

I have attached my code which compiles and runs for what its worth.

     Dave

Hi,

I am working on using traits for growth functions. Steve provided me some example code and I have been trying to extend it. This looks like it uses templates inside templates and gets confusing. Attached is some example code and I would appreciate any help on debugging it. I think the problem is that for the same function parameter types I have two different return types, so I made two different traits. I think it is important to get this sorted out because it may be something we will use often in creating libraries of functions.

Thanks,

Mark


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Mark Maunder
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