[boost] [Boost-bugs] [ boost-Bugs-1025124 ] boost::function doesn't accept classes declared in functions

From: SourceForge.net (noreply_at_[hidden])
Date: 2004-09-09 08:47:04

Bugs item #1025124, was opened at 2004-09-09 06:47
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1025124&group_id=7586

Category: functional
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Mark Rodgers (mark_rodgers)
Summary: boost::function doesn't accept classes declared in functions

Initial Comment:
Submitter:
John Engström
<john.engstrom\spam\@\spam\solcorp.com>

Using MSVC 7.1, I use a functor defined in-scope, as in
the following example.

///////////////////// code snippet

void bar()
{
    ...

    struct my_functor
    {
        void operator () (int arg1, int arg2) {

            ...
            foo();
            ...
        }

        ...
    };

    my_functor my_functor_instance;

    boost::function2<void, int, int> my_function1 =
boost::ref(my_functor_instance);
    boost::function2<void, int, int> my_function2 =
my_functor_instance;
}

/////////////////// explanation

This fails to compile, see below for error messages,
however if I move the declaration of the functor out of
the function bar(), it compiles fine. Perhaps it only
happens with MSVC.

/////////////////// error messages

main.cpp(116): error C2893: Failed to specialize
function template 'const boost::reference_wrapper<T>
boost::ref(T &)'

main.cpp(117): error C2440: 'initializing' : cannot
convert from 'WinMain::my_functor' to
'boost::function2<R,T0,T1>'
        with
        [
            R=void,
            T0=int,
            T1=int
        ]

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