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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/51829] decltype() deduces non-const but only in a template
Date: Sun, 13 May 2012 09:37:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51829

--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> 2012-05-13 09:0=
6:42 UTC ---
With boost 1.49, g++-4.7 compiles the code just fine, while g++-4.6 gives:

u.cc: In function =E2=80=98void bug() [with <template-parameter-1-1> =3D vo=
id]=E2=80=99:
u.cc:14:24:   instantiated from here
u.cc:11:3: error: cannot convert =E2=80=98const type {aka const
boost::proto::exprns_::expr<boost::proto::tagns_::tag::address_of,
boost::proto::argsns_::list1<const
boost::proto::exprns_::expr<boost::proto::tagns_::tag::bitwise_or,
boost::proto::argsns_::list2<const
boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,
boost::proto::argsns_::term<boost::spirit::terminal_ex<boost::spirit::tag::=
eps,
boost::fusion::vector1<bool> > >, 0l>&,
boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,
boost::proto::argsns_::term<const char&>, 0l> >, 2l>&>, 1l>}=E2=80=99 to =
=E2=80=98const type*
{aka const boost::proto::exprns_::expr<boost::proto::tagns_::tag::bitwise_o=
r,
boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagn=
s_::tag::terminal,
boost::proto::argsns_::term<boost::spirit::terminal_ex<boost::spirit::tag::=
eps,
boost::fusion::vector1<bool> > >, 0l>&,
boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,
boost::proto::argsns_::term<const char&>, 0l> >, 2l>*}=E2=80=99 in assignme=
nt