A way to determine the number of elements in a structured binding

• magic_get

  9 193 8.2 C++

  std::tuple like methods for user defined types without any macro or boilerplate code

Libraries like magic_get expose the members of an aggregate class/struct to allow writing generic code for things like pretty printing and serialization without anything special done to the class itself. They often rely on structured bindings for the decomposition (*), but find the number of elements via SFINAE on aggregate initialization, as an aggregate type can be initialized only from as many objects as it has members. It would be nicer if you could SFINAE directly on the structured binding itself, as then the type could have user-defined constructors (which aggregates can't). Unfortunately, this is not possible since structured binding is a statement and not an expression. Unless you're using Clang, where the GNU statement expressions extension allows you to do SFINAE on them, as in here.

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