Subject: [Boost-bugs] [Boost C++ Libraries] #8313: const definition of boost::none
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-03-20 11:32:52
#8313: const definition of boost::none
------------------------------+---------------------------------------------
Reporter: anonymous | Owner: fcacciola
Type: Bugs | Status: new
Milestone: To Be Determined | Component: optional
Version: Boost 1.52.0 | Severity: Problem
Keywords: |
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boost provides an object named boost::none of type boost::none_t. it
originally stems from Boost.Optional, but since it is in the root
directory, boost/none.hpp, I guess it is there for other uses as well.
I tried to use it in the following way, which fails, because of the
definition of boost::none:
template<class T,class T2=boost::none_t>
struct A{
A(T &a,T2 &b=none);
};
boost::none is an object defined to be const, so it is not accepted as a
non-const reference. I don't see a reason why it has to be const. its
value is never used anyway.
I'll probably have to use boost::enable_if instead, to enable a "unary"
constructor if and only if T2 == boost::none_t
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/8313> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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