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Use this pointer for subPreBasis(i) in lambdas [bugfix]

Simon Praetoriusrequested to merge
simon.praetorius/dune-functions:issue/subprebasis_this into master

Summary

Adds the pointer this-> when calling subPreBasis(i) inside of lambdas.

Details

The recently introduced function subPreBasis(i) that returns the i'th subPreBasis is used in lambdas without the this-> pointer. This is fine in recent compilers, but fails in gcc6.

Discussion

Maybe one should add a test for older compilers in the ci system, to catch such bugs.

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