linear_subspace.hpp:59:3: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
const std::size_t dimension() const{
^~~~~~
/linear_trial_column_subspace.hpp:147:3: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
const std::size_t dimension() const{ return linSpace_.dimension(); }
^~~~~~