join() utility function

[Ichthyostega]

usually, a join() utility function creates a string from some kind of container, iterator or enumeration, typically by interspersing a delimiter string, which is given as parameter.

<boost/algorithm/string/join.hpp> does exactly this, just it expects a container / a sequence of strings. What we'd need would be a join() utility function, which accepts

• a container
• or a pair of STL iterators
• or a Lumiera Forward Iterator

and then automatically converts each of the elements to string.

This requires a bit of tinkering and playing with template metaprogramming to get all of these various cases behind a single API. We have already metafunctions In lib/meta/trait.hpp to distinguish a STL like container and a Lumiera Forward Iterator.

Why bothering with such a nice-to-have? Well, it saves us some copy-n-paste-programming

[Ichthyostega]

Resolved some time ago, in 2015 (7fcee7496), while improving our generic diagnostic string representation. We can now display basically everything as string, and the interpolation
of an sequence into a string becomes low hanging fruit then....

[Undercover Agent]

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