[boost] [Boost-bugs] [ boost-Bugs-1464566 ] uniform_01 copies engine instead of using a reference

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-04-04 19:31:43

Bugs item #1464566, was opened at 2006-04-04 19:31
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Category: random
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Hubert Chan (uhoreg)
Assigned to: Jens Maurer (jmaurer)
Summary: uniform_01 copies engine instead of using a reference

Initial Comment:
In the uniform_01 class, the constructor takes a
base_type (i.e. the random number generator) as its
argument, and the _rng member is just a base_type. 
This results in uniform_01 copying the random number
generator, along with its state.  Thus if one creates
several uniform_01 objects (e.g. one at the beginning
of each of several functions), they will all return the
same random numbers.

The constructor should take a reference (i.e.
base_type&) as its argument, and the _rng member should
be a base_type&.  (Indeed, the documentation at
http://www.boost.org/libs/random/random-distributions.html#uniform_01
says that the constructor takes a base_type&.)

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