[QPID-3206] Variant converts from negative number in string format to unsigned integer without error

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8, 0.10
• Fix Version/s: 0.11
• Component/s: C++ Broker, C++ Client
• Assignee: Gordon Sim
• Reporter: Gordon Sim
• Created: 13/Apr/11 10:13
• Updated: 29/Jul/13 18:54
• Resolved: 14/Apr/11 14:56

Description

E.g.
uint16_t i = 0;
qpid::types::Variant v = "-5";
i = v;

The above results in an exception in older versions of gcc (e.g. 4.1.2) but sets i to 65531 on later versions (e.g. 4.4.4). This is a result of a fix to the gcc std library to be compliant with specification which requires stringstream to accept negative values even for unsigned ints (which is the behaviour of scanf).

See e.g:
http://boost.2283326.n4.nabble.com/conversion-lexical-cast-doesn-t-throw-td2593967.html
http://groups.google.com/group/comp.lang.c++.moderated/browse_thread/thread/97475b21515462c9/ce369a327fa39243#ce369a327fa39243