[Boost-bugs] [Boost C++ Libraries] #10073: Uninitialized variable in boost::multiprecision::sqrt

Subject: [Boost-bugs] [Boost C++ Libraries] #10073: Uninitialized variable in boost::multiprecision::sqrt
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-05-27 08:43:27

#10073: Uninitialized variable in boost::multiprecision::sqrt
---------------------------------+----------------------------
 Reporter:  adammerz@…           |      Owner:  johnmaddock
     Type:  Bugs                 |     Status:  new
Milestone:  Boost 1.56.0         |  Component:  multiprecision
  Version:  Boost 1.55.0         |   Severity:  Problem
 Keywords:  multiprecision sqrt  |
---------------------------------+----------------------------
 The variable `t` in `boost::multiprecision::sqrt` is default-initialized.
 This is fine when `sqrt` is called with a multiprecision type e.g.
 `cpp_int`, but when called with a primitive scalar e.g. `unsigned`, it
 causes the result of `sqrt` to be incorrect.

 The fix is simply to change `Integer t;` to `Integer t = 0;`. I've tested
 locally and the results appear fine afterwards.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10073>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.