Hi, everyone!
I ran into a compiler error that feels strange to me. And I use C++ only
occasionally.
/home/li/cbrc01.cc:1378:8: error: no match for ‘operator*=’ (operand types
are ‘const dealii::TrilinosWrappers::MPI::Vector’ and ‘int’)
1378 | um *= -1;
| ~~~^~~~~
/home/li/share/dealii-9.6.0/include/deal.II/lac/trilinos_vector.h:1993:5:
note: candidate: ‘dealii::TrilinosWrappers::MPI::Vector&
dealii::TrilinosWrappers::MPI::Vector::operator*=(dealii::TrilinosScalar)’
(near match)
1993 | Vector::operator*=(const TrilinosScalar a)
| ^~~~~~
/home/li/share/dealii-9.6.0/include/deal.II/lac/trilinos_vector.h:1993:5:
note: passing ‘const dealii::TrilinosWrappers::MPI::Vector*’ as ‘this’
argument discards qualifiers
make[2]: *** [CMakeFiles/cbrc01.dir/build.make:76:
CMakeFiles/cbrc01.dir/cbrc01.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:90: CMakeFiles/cbrc01.dir/all] Error 2
make: *** [Makefile:91: all] Error 2
According to the above error message, the compiler indeed recognized "um"
to be a dealii::TrilinosWrappers::MPI::Vector object. It further suggested
that it is a "near match" to the defined operator "Vector::operator*=(const
TrilinosScalar a)".
Furthermore, Step-41 used exactly the same operation in method
void ObstacleProblem<dim>::update_solution_and_constraints()
in the line
contact_force *= -1;
I was able to compile and run Step-41 without error. That indicates that my
installations of dealii and Trilinos work for the operator *=.
Your help is greatly appreciated. Thanks in advance.
Best,
X. Li
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