Merged revisions 61152,61185 via svnmerge from https://svn.boost.org/svn/boost/trunk
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r61152 | jhunold | 2010-04-09 11:04:51 +0200 (Fr, 09 Apr 2010) | 2 lines
Silence gcc warnings when using UnaryFunction with reference parameters.
r61185 | jhunold | 2010-04-10 19:50:26 +0200 (Sa, 10 Apr 2010) | 2 lines
Dummy-Constructor only for gcc > 4.