Boost C++ Libraries: Ticket #11336: units: base_unit_info name and symbol unavailable for absolute units

Steven Watanabe — Fri, 22 May 2015 22:25:50 GMT

absolute is not a base_unit, so this is not the correct fix. Can you provide a small test case the demonstrates the problem? The test for output seems to be passing for absolute with both symbols and unit names.

attachment set

Mon, 25 May 2015 11:23:45 GMT

attachment → test_abs_units.cpp

Example of failure to get unit name/symbol from absolute units

Mon, 25 May 2015 11:31:20 GMT

Hi Steven,

I have attached an example file to demonstrate the problem. Uncomment the comments to get my workaround for getting it to compile and function, though I don't really like this.

I'm not using base_unit_info directly; I'm using name_string and symbol_string from io.hpp, and these are failing with absolute units. I assumed these should work with all unit types for output, rather than being limited to base units.

Kind regards, Roger

Steven Watanabe — Tue, 26 May 2015 15:42:43 GMT

So, the problem is that there aren't overloads of name_string/symbol_string for absolute. That's easy to fix.

Tue, 26 May 2015 21:37:59 GMT

That could certainly be the case. Being so heavily templated, I wasn't entirely certain exactly where the boundary between internal implementation and public interface was. If it's as simple as overloading those methods, that's great.

Would that also imply the absolute ostream operator<< could be removed since they would do its job?