Re: [Boost-bugs] [Boost C++ Libraries] #4988: [units] improve error messages when quantities are not convertible into one another.

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4988: [units] improve error messages when quantities are not convertible into one another.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-02-19 11:36:02

#4988: [units] improve error messages when quantities are not convertible into one
another.
--------------------------------------------------------+-------------------
  Reporter:  Alfredo Correa <alfredo.correa@…>          |       Owner:  matthiasschabel          
      Type:  Feature Requests                           |      Status:  new                      
 Milestone:  To Be Determined                           |   Component:  units                    
   Version:  Boost 1.46.0                               |    Severity:  Problem                  
Resolution:                                             |    Keywords:  conversion, error message
--------------------------------------------------------+-------------------

Comment (by Benaka Moorthi <benaka.moorthi@…>):

 I've uploaded an archive w/ two patches that will provide better compiler
 error messages. GCC will now output error messages similar to those
 outputted by MSVC, and on every compiler, if derived dimension headers
 aren't included or the constructed dimension isn't named anywhere, the
 error message will no longer contain 'dim<X_base_dimension,
 static_rational<N, D> >' types, but instead 'X<N, D>' types. This should
 make it easier to see what's going on. I've included a README in the
 archive detailing my changes.

 As an example, here is the new output when compiling & running the
 fail_implicit_conversion test using GCC:
 ...patience...
 ...found 719 targets...
 ...updating 3 targets...
 gcc.compile.c++
 ../../../bin.v2/libs/units/test/fail_implicit_conversion.test/gcc-4.4.3/release/fail_implicit_conversion.o
 fail_implicit_conversion.cpp: In function ‘int main(int, char**)’:
 fail_implicit_conversion.cpp:32: error: conversion from ‘const
 boost::units::quantity<boost::units::unit<boost::units::length_dimension,
 boost::units::si::system, void>, double>’ to non-scalar type ‘const
 boost::units::quantity<boost::units::unit<boost::units::length_dimension,
 boost::units::cgs::system, void>, double>’ requested

 (failed-as-expected)
 ../../../bin.v2/libs/units/test/fail_implicit_conversion.test/gcc-4.4.3/release/fail_implicit_conversion.o
 **passed**
 ../../../bin.v2/libs/units/test/fail_implicit_conversion.test/gcc-4.4.3/release/fail_implicit_conversion.test
 ...updated 3 targets...

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4988#comment:1>
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