[boost] [Boost-bugs] [ boost-Bugs-1239906 ] no Boolean conversion for boost::rational

From: SourceForge.net (noreply_at_[hidden])
Date: 2005-07-17 15:15:29

Bugs item #1239906, was opened at 2005-07-17 16:15
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Daryle L. Walker (dlwalker)
Assigned to: Nobody/Anonymous (nobody)
Summary: no Boolean conversion for boost::rational

Initial Comment:
The boost::rational class template, in header file <boost/
rational.hpp>, does not support conversion to a Boolean value.  It 
does have an "operator !" defined, though.  It is a surprise for a type 
to have one of these operations but not the other.  Currently code 
like "if ( !r )" works but not "if ( r )", which should be expected.  A 
solution is to add a conversion operator to a type that can be used in 
Boolean contexts, but as little else as possible.  A suggestion is to 
use a pointer-to-member (to data or function) type that is unique to 
each version of boost::rational, where the exact values are private.

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