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Forbid creation of LocalFunction from temporary

Carsten Gräser requested to merge feature/DiscreteGlobalBasisFunction-forbid-reference-to-temporary into master

Since the LocalFunction stores a pointer to the DiscreteGlobalBasisFunction, calling localFunction(...) with a temporary leads to a dangling reference.

This happens, e.g., when passing a temporary DiscreteGlobalBasisFunction to VTKWriter::addVertexData(...) because the latter does not store its argument, but only the obtained LocalFunction.

Thanks to @max.kahnt for pointing out the issue.

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