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[Hybrid::ifElse()] Make the id() argument a constexpr functor

Jö Fahlke requested to merge constexpr-ifelse into master

The id argument for ifElse branches is a functor used to create dependent contexts. It can however not be used in constant expressions in C++14, because lambdas only become constexpr in C++17. This MR replaces the lambda by a manually written functor, which can be constexpr already in C++14.

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