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I fully understand you're targeting clang++ but everything else compiles with g++ -std=c++17 -fno-exceptions -fno-rtti -nodefaultlibs -fPIC -O2 -c -o ...

g++ (version 8.3.0) dislikes some templates:

fseq.cpp:830:26: error: could not convert ‘ss.F::_SeqSingle::t[0]’ from ‘const Tree’ {aka ‘const F::Union<F::_Boxed<F::_FragHeader>, F::Tree2, F::Tree3>’} to ‘F::Frag’ {aka ‘F::_Boxed<F::_FragHeader>’}
             return ss.t[0];

etc. Maybe it's just a case of selecting the right field in the union? It should return the first one, I guess? Or is it that the const qualifier is dropped? I found the definition of Union in fvalue.h but it's not obvious to me how it works yet.

Maybe you don't mind about g++ compatibility, but it would certainly increase your user-base among those for whom it's not easy to install clang.

The current code-base uses underscore prefixes for the names of "hidden" definitions. Although this seems to build OK with my version of clang, redditor Yuushi points out:

As a nitpick, the usage of _ before every variable is a worry, though. C++ reserves any name starting with _ and followed by a capital letter.

well, it's all in the title :)

Hi.

I couldn't find any forum, discussion group or eMail-Address, hence I allowed myself to ask this question here.

While looking for an implementation of finger trees in C++, I came across libf. Using the implementation of 23-fingertrees underlying the sequence type, is it possible to annotate each node with a measure?

More concretely, what I'm trying to do is very similar to this: http://jkff.info/articles/ire/

many thanks.