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List:       cfe-dev
Subject:    [cfe-dev] boost::ref issue
From:       Laszlo Nagy <rizsotto.mailinglist () gmail ! com>
Date:       2013-02-19 17:51:16
Message-ID: CAN=tS+FUhdubKERdVbRLx2KBxa8XZAvqcg9fzgfnFCF4vSuB+A () mail ! gmail ! com
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Hi All,

I'm trying to compile a C++ project with Clang. It compiles with gcc
without error, but Clang breaks. Unfortunately could not simplify further
and has 'boost' as dependency. I need some help.

How can I change the code to compile with clang? And if it is a not
expected behavior of Clang, what could be an error report for this?

Thanks,
Laszlo


$ clang++ -c test.cpp
test.cpp:9:64: error: no matching function for call to 'ref'
        std::for_each(v.begin(), v.end(), boost::bind(&S::bar,
boost::ref(this), _1));
                                                               ^~~~~~~~~~
/usr/include/boost/ref.hpp:64:63: note: candidate function [with T = S *]
not viable: no known conversion from 'S *' to 'S *&' for 1st argument
template<class T> inline reference_wrapper<T> BOOST_REF_CONST ref(T & t)
                                                              ^
1 error generated.

[Attachment #5 (text/html)]

<div dir="ltr">Hi All,<div><br></div><div style>I&#39;m trying to compile a C++ \
project with Clang. It compiles with gcc without error, but Clang breaks. \
Unfortunately could not simplify further and has &#39;boost&#39; as dependency. I \
need some help.</div> <div style><br></div><div style>How can I change the code to \
compile with clang? And if it is a not expected behavior of Clang, what could be an \
error report for this?</div><div style><br></div><div style>Thanks,</div><div style> \
Laszlo</div><div style><br></div><div style><br></div><div style><div>$ clang++ -c \
test.cpp </div><div>test.cpp:9:64: error: no matching function for call to \
&#39;ref&#39;</div><div>        std::for_each(v.begin(), v.end(), \
boost::bind(&amp;S::bar, boost::ref(this), _1));</div> <div>                          \
^~~~~~~~~~</div><div>/usr/include/boost/ref.hpp:64:63: note: candidate function [with \
T = S *] not viable: no known conversion from &#39;S *&#39; to &#39;S *&amp;&#39; for \
1st argument</div> <div>template&lt;class T&gt; inline reference_wrapper&lt;T&gt; \
BOOST_REF_CONST ref(T &amp; t)</div><div>                                             \
^</div><div>1 error generated.</div></div></div>

--f46d04339f02f9f45d04d6177cdd--


["test.cpp" (text/x-c++src)]

#include <vector>
#include <algorithm>
#include <boost/bind.hpp>

struct S
{
    void foo() {
        std::vector<int> v;
        std::for_each(v.begin(), v.end(), boost::bind(&S::bar, boost::ref(this), _1));
    }

    void bar(int j) { m_j += j; }

    int m_j;
};


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