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Allow constant expressions in unpackIntegerSequence

Merged Allow constant expressions in unpackIntegerSequence
feature/constexpr-unpack-integer-sequence into master
Merged Santiago Ospina De Los Ríos requested to merge feature/constexpr-unpack-integer-sequence into master
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dune/common/indices.hh
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@@ -120,7 +120,7 @@ namespace Dune
* \returns Result of calling f with unpacked integers.
*/
template<class F, class I, I... i>
decltype(auto) unpackIntegerSequence(F&& f, std::integer_sequence<I, i...> sequence)
decltype(auto) constexpr unpackIntegerSequence(F&& f, std::integer_sequence<I, i...> sequence)
{
return f(std::integral_constant<I, i>()...);
}