error: wrong number of template arguments (1, should be 2) static MappingQ<dim> m(2);

[曾元圆]

I‘m compiling a source code written by others. And this error occurred.  I know it's because of the version of dealii. And I just want to know what this error really mean and how can I solve such kind of error. Because now I just want to be confirmed that the code work well so I don't want to go deep into the code (It's too time consuming to learn in detail how everything is going inside the code for me now)

/home/dyfluid/DG/dflo/src/claw.cc: In member function ‘const dealii::Mapping<dim>& ConservationLaw<dim>::mapping() const’:

/home/dyfluid/DG/dflo/src/claw.cc:175:26: error: wrong number of template arguments (1, should be 2)

       static MappingQ<dim> m(2);

                          ^

In file included from /home/dyfluid/dealii_lib/deal.II-v8.5.1/include/deal.II/fe/mapping_q1.h:21:0,

                 from /home/dyfluid/DG/dflo/src/claw.cc:26:

/home/dyfluid/dealii_lib/deal.II-v8.5.1/include/deal.II/fe/mapping_q_generic.h:34:26: note: provided for ‘template<int <anonymous>, int <anonymous> > class dealii::MappingQ’

 template <int,int> class MappingQ;

                          ^

/home/dyfluid/DG/dflo/src/claw.cc: In instantiation of ‘ConservationLaw<dim>::ConservationLaw(const char*, unsigned int, const dealii::FE_DGQArbitraryNodes<dim>&) [with int dim = 2]’:

/home/dyfluid/DG/dflo/src/claw.cc:1132:16:   required from here

/home/dyfluid/DG/dflo/src/claw.cc:72:59: warning: unused parameter ‘degree’ [-Wunused-parameter]

                                        const unsigned int degree,

                                                           ^

/home/dyfluid/DG/dflo/src/claw.cc: In instantiation of ‘void ConservationLaw<dim>::run() [with int dim = 2]’:

/home/dyfluid/DG/dflo/src/claw.cc:1132:16:   required from here

/home/dyfluid/DG/dflo/src/claw.cc:1043:20: warning: unused variable ‘nonlin_iter’ [-Wunused-variable]

       unsigned int nonlin_iter = 0;

                    ^

/home/dyfluid/DG/dflo/src/claw.cc: In instantiation of ‘void ConservationLaw<dim>::read_parameters(const char*) [with int dim = 2]’:

/home/dyfluid/DG/dflo/src/claw.cc:1132:16:   required from here

/home/dyfluid/DG/dflo/src/claw.cc:132:19: warning: ‘virtual bool dealii::ParameterHandler::read_input(const string&, bool, bool, const string&)’ is deprecated [-Wdeprecated-declarations]

    prm.read_input (input_filename);

                   ^

In file included from /home/dyfluid/DG/dflo/src/claw.cc:3:0:

/home/dyfluid/dealii_lib/deal.II-v8.5.1/include/deal.II/base/parameter_handler.h:1685:16: note: declared here

   virtual bool read_input (const std::string &filename,

                ^

/home/dyfluid/DG/dflo/src/claw.cc: In instantiation of ‘const dealii::Mapping<dim>& ConservationLaw<dim>::mapping() const [with int dim = 2]’:

/home/dyfluid/DG/dflo/src/claw.cc:1132:16:   required from here

/home/dyfluid/DG/dflo/src/claw.cc:176:14: error: invalid initialization of reference of type ‘const dealii::Mapping<2, 2>&’ from expression of type ‘int’

       return m;

              ^

/home/dyfluid/DG/dflo/src/claw.cc: In instantiation of ‘void ConservationLaw<dim>::setup_system() [with int dim = 2]’:

/home/dyfluid/DG/dflo/src/claw.cc:1132:16:   required from here

/home/dyfluid/DG/dflo/src/claw.cc:344:17: warning: unused variable ‘EPS’ [-Wunused-variable]

    const double EPS = 1.0e-10;

                 ^

CMakeFiles/dflo.dir/build.make:206: recipe for target 'CMakeFiles/dflo.dir/claw.cc.o' failed

make[2]: *** [CMakeFiles/dflo.dir/claw.cc.o] Error 1

CMakeFiles/Makefile2:195: recipe for target 'CMakeFiles/dflo.dir/all' failed

make[1]: *** [CMakeFiles/dflo.dir/all] Error 2

Makefile:83: recipe for target 'all' failed

make: *** [all] Error 2

[Wolfgang Bangerth]

On 09/30/2017 08:46 AM, 曾元圆 wrote:
> I‘m compiling a source code written by others. And this error occurred. I
> know it's because of the version of dealii. And I just want to know what this
> error really mean and how can I solve such kind of error. Because now I just
> want to be confirmed that the code work well so I don't want to go deep into
> the code (It's too time consuming to learn in detail how everything is going
> inside the code for me now)
>
>
> /home/dyfluid/DG/dflo/src/claw.cc: In member function ‘const
> dealii::Mapping<dim>& ConservationLaw<dim>::mapping() const’:
> /home/dyfluid/DG/dflo/src/claw.cc:175:26: error: wrong number of template
> arguments (1, should be 2)
> static MappingQ<dim> m(2);

The problem will go away if you add
#include <deal.II/fe/mapping_q.h>
to the file.

Best
W.

--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/