cml::vector<const double *, cml::dynamic<>> problem

[wzhy]

Hi! I wrote code like this in a header file: typedef cml::vector<const double *, cml::dynamic<>> vector_pdd; Then cml::vector_cpdd pData;

I got some errors when compiling it :

error: invalid use of incomplete type 'cml::vector_traits<cml::vector<const double, cml::allocated<> > >::element_traits' {aka 'struct cml::scalar_traits<const double, void>'} In template: implicit instantiation of undefined template 'cml::scalar_traits<const double *>'

How can I fix this ? I'm new in C++... And [http://cmldev.net/] can not open. So is there any doc about CML? Thank you very much!

[demianmnave]

Hi wzhy,

I wrote code like this in a header file: typedef cml::vector<const double *, cml::dynamic<>> vector_pdd;

The first template argument should be a basic numeric type; e.g. double or float. So, you will want something like this:

using vector_pdd = cml::vector<double, cml::dynamic<>>;

Alternatively, you can use the matching predefined vector type from cml/vector/types.h; e.g.:

using vector_pdd = cml::vectord;

And [http://cmldev.net/] can not open. So is there any doc about CML?

Unfortunately, I only have the in-source, Doxygen-formatted documentation right now. Apparently, real documentation has been on my list for some time (https://github.com/demianmnave/CML/issues/7)! The tests may also be useful for seeing how things fit together.

Let me know if you have any more trouble with the compiler error.

[wzhy]

Thanks for your reply, demianmnave! I knew the /matrix/types.h and /vector/types.h there. Actually, I am immigrating one program(at least over 12 years old) using your CML^^ The version of CML this program used may be 1.0 as the files organization is the same with 1.0~1.0.4 which are downloaded from sourceforge. codes like this work fine in this old program:

typedef cml::vector<const double *, cml::dynamic<>> vector_pdd;
cml::vector_pdd pData;
pData.data()
pData.resize(5)

Now I want to immigrate CML to V2.2.1 release. So problem occurs. Any suggestion is welcomed.

BTW: CML_VERSION and CML_VERSION_STRING in /cml/version.h in the V2.2.1 release may be modified to 2.2.1^^

[demianmnave]

Actually, I am immigrating one program(at least over 12 years old) ...

Yikes, that sounds like a challenge! I don't know if CML2 will be the right fit since it keeps tighter control over the types it understands (essentially, numeric-like types).

That said, you could try specializing cml::scalar_traits as unsigned long long and see if that gets you further along:

namespace cml {

/** Specialization of scalar traits for pointer types. */
template<typename Base> struct scalar_traits<Base*, void>
: detail::default_integral_traits<unsigned long long>
{
  static constexpr Scalar sqrt_epsilon() { return 0; }
};

/** Specialization of scalar traits for pointer const types. */
template<typename Base> struct scalar_traits<const Base*, void>
: detail::default_integral_traits<unsigned long long>
{
  static constexpr Scalar sqrt_epsilon() { return 0; }
};

}

If the code does not rely on math operators, you might have better luck swapping out cml::vector<...> with std::vector<const double*>. If you were able to post a few examples of how the code is using cml::vector<>, I might be able to give you more specific advice.

[wzhy]

Hi Demian, The method you gave above is not working... I read the code of my program carefully and found that the author used vector_pdd as a dynamic 2D Array (as C style)^^ So I used cml::vectord *pData and pData = new cml::vectord[DataNum] replace it. Maybe ugly and it worked! Then I immigrated all the other codes using CML from v1.0 to v2.2.1. Only one function should be changed in my code: cml::T --> cml::transpose. And then the whole program worked well so far. Thank you very much again!

[demianmnave]

Hi Will, glad you figured it out without having to do anything fancy!

Good luck with your project, and feel free to submit another issue if you run into any more problems.

[wzhy]

Have a nice weekend^^