Merge branch 'carsten.graeser/dune-typetree-feature/drop-lazy-decltype'
This switches the detection of a templated child() method to a concept. It's a lot nicer than my abomination... This is a partial fix for #2 (only works for master because it requires the concept support in dune-common). References !5. * carsten.graeser/dune-typetree-feature/drop-lazy-decltype: [cleanup] Drop _lazy_static_decltype in favour of return type deduction Add dummy overload to generate nice compiler errors Use concepts to check for the child<0>() method
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