One Constructor with default values instead of multiple ctors with different number of arguments

[rosettacommons]

One Constructor with default values instead of multiple ctors with different number of arguments

[lyskov]

Re using Pybind11 default: - making bindings default arguments that way will be evaluate using Python evaluation strategy (ie evaluate once during binding time) which will be error prone and quite confusing for any non constant defaults (consider for example default that is a function call - in C++ such function would be called each time function is called)

re need to fully qualify names for default parameters: i think that is unavoidable. The core issue here is that default value specified during class declaration and during binding code evaluate in different translation units and there is no general way to map one to the other (consider for example that besides using unqualified declaration from class inner namespace C++ code could also use unqualified default value from unrelated namespaces pulled-in with using detectives). So using lambdas and explicitly generating multiple overloads seems to be the only general solution to me.

[yosoufe]

That makes sense.