New subject: Boost.Signals example/doc_view application question

4 Aug 2006


      [snip]
...
The View abstract base class requires concrete bases to provide a
concrete implementation of the refresh() member function matching the
slot signature required.
class View
{
public:
    virtual void refresh(bool) const = 0;
    // ...
};
Here's my problem.  If I change the signal to take no args using the
preferred or portable syntax I get compilation errors:
class Document
{
public:
    typedef boost::signal< void () >  signal_t;
    // ...
void append(const char* s)
    {
        m_text += s;
        m_sig(true);
You should use
     m_sig();
instead!
...
}
    // ...
};
class View
{
public:
    virtual void refresh() const = 0;
    // ...
};
Compilation output (msvc-7.1):
Compiling...
SignalTest.cpp
c:\Boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2825:
'F::result_type': cannot form a qualified name
        c:\Boost\include\boost-1_33_1\boost\bind\bind_template.hpp(15) :
see reference to class template instantiation
'boost::_bi::result_traits<R,F>' being compiled
        with
        [
            R=boost::_bi::unspecified,
            F=void (__thiscall View::* )(void) const
        ]
        c:\development\SignalTest\SignalTest.cpp(49) : see reference to
class template instantiation 'boost::_bi::bind_t<R,F,L>' being compiled
        with
        [
            R=boost::_bi::unspecified,
            F=void (__thiscall View::* )(void) const,
            L=boost::_bi::list2<boost::_bi::list_av_2<View
*,boost::arg<1>>::B1,boost::_bi::list_av_2<View *,boost::arg<1>>::B2>
        ]
c:\Boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2039:
'result_type' : is not a member of 'operator``global namespace'''
c:\Boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2146: syntax
error : missing ';' before identifier 'type'
c:\Boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2955:
'boost::_bi::type' : use of class template requires template argument list
        c:\Boost\include\boost-1_33_1\boost\bind.hpp(112) : see
declaration of 'boost::_bi::type'
c:\Boost\include\boost-1_33_1\boost\bind.hpp(63) : fatal error C1903:
unable to recover from previous error(s); stopping compilation
Cheers,

Freddie

Re: [Boost-users] Boost.Signals example/doc_view application question

Wu Yinghui, Freddie

Allen Gooch

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