[boost] [variant] static_visitor constructor error with boost 1.56.0 and g++ 4.5.1

Subject: [boost] [variant] static_visitor constructor error with boost 1.56.0 and g++ 4.5.1
From: Richard Hadsell (hadsell_at_[hidden])
Date: 2014-08-14 14:54:25

I am trying to upgrade from Boost 1.55 to 1.56.  I get this error with G++ 4.5.1:

In file included from ...:
.../boost/variant/static_visitor.hpp:52:24: error: 'boost::static_visitor<R>::static_visitor()' declared with non-public access cannot be defaulted in the class body
.../boost/variant/static_visitor.hpp:53:25: error: 'boost::static_visitor<R>::~static_visitor()' declared with non-public access cannot be defaulted in the class body

The OS is Linux Fedora 14.

The compiler is gcc version 4.5.1 20100924 (Red Hat 4.5.1-4).

I saw a similar problem in noncopyable.hpp, when upgrading to Boost 1.55.  Andrey Semashev fixed it, and it looks like static_visitor requires the same fix.

In static_visitor.hpp change line 51 from

#ifndef BOOST_NO_DEFAULTED_FUNCTIONS

to

#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && !defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS)

I think this would be appropriate for any non-public defaulted functions, not just the ones that trip up code I happen to compile.

Dick Hadsell			203-992-6320  Fax: [phone]
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