Understanding C++ STL errors

Question

It's very annoying to see a 10 kilometer STL error list just because you missed something that probably don't even have to do at all with the STL.

Any idea on how to remove these? or at least, get something clear.

[It's not called the "STL"](http://stackoverflow.com/questions/5205491/whats-this-stl-vs-c-standard-library-fight-all-about/5205571#5205571). — user3447428, Mar 23 '14 at 06:27
I have observed the same thing. CLang is more concise. I also notice the compilation speed is much quicker with CLang++ than g++ on Mac OS X Mavericks on a 2010 MacBook Pro i5. — CPlusPlus OOA and D, Mar 23 '14 at 09:40

score 1 · Answer 1 · answered Mar 23 '14 at 06:55

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This is an inherent problem to unconstrained templates.

When instantiating it will fail at the point of use, deeply nested sometimes, not at the point of call.

But there is hope, look at this: Concepts Lite. After this, if some day done, full featured concepts will come. These would enable even separate compilation. It would be really interesting, because this would be needed in modules. Modules will come somewhere from here I suspect: Clang modules

As for a solution, there are techniques such as static_assert to make it fail eagerly, but this is not going to depend upon you.

answered Mar 23 '14 at 06:55

Germán Diago

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Very interesting, really! didn't know anything about this. – alesegdia Mar 23 '14 at 14:15
Thanks, just wanted to be informative even if it won't solve your blues :) – Germán Diago Mar 23 '14 at 16:38

score 1 · Accepted Answer · answered Mar 23 '14 at 07:42

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There is a utility specifically designed to parse and simplify STL errors, because they are so wordy. (It's not designed to simplify arbitrary template errors, just STL.) See http://www.bdsoft.com/tools/stlfilt.html

answered Mar 23 '14 at 07:42

StilesCrisis

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Understanding C++ STL errors

2 Answers2