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From: Steven Kirk (steven.kirk_at_[hidden])
Date: 2001-11-19 10:38:57

That looks fantastic, doug. Only problem was Borland C++ was giving these
error messages:

Error E2247 signal_base.cpp 67: 'boost::detail::signals::signal_base::flags'
is not accessible in function
ignal_base *)
Error E2247 signal_base.cpp 72: 'boost::detail::signals::signal_base::flags'
is not accessible in function
*** 2 errors in Compile ***:

As a temporary measure, I got it to compile by hacking signal_base.hpp to
make "flags" public, and everything else works so far...

> An updated version of the Signals library is now available at:
> I would appreciate comments on any aspects of this library, and would like
> to move toward a formal review in the near future.
> Short summary of features:
> - Signals can have any return type and any ("reasonable") number of
> callback parameters.
> - Any function object that is callable given the callback parameter
> types of a signal can be connected to that signal as a "slot".
> - Coalescing of return values: return values from multiple slots can be
> coalesced into a single return value for the signal in a user-defined way.
> The interface to return values is a simple input iterator sequence.
> - Control of slot calling: user-defined "combiners" (that coalesce
> return values) can opt not to call all slots.
> - Signal/slot connections can be broken at any time (including while the
> signal is being called, the slot is being called, and in pathological
> recursive cases where the signals calls a slot which calls the signal...).
> - Automatic connection lifetime management: signal/slot connections will
> disappear automatically when one of the objects involved is destructed.
> This requires only a small change to the types of those objects (an
> additional base class).
> - Support for automatic connection lifetime management extensible to any
> "binding" library. Currently only works with Boost.Bind.
> Changes from the previous version:
> - Refactoring of signal connection management code (= much smaller
> executables)
> - Exception safety greatly improved (it is now safe for slots to throw
> exceptions)
> - Uses Boost.Build
> - Documentation (reference & tutorial)
> - Updated to work with newer versions of Iterator Adaptors
> Thanks,
> Doug Gregor
> gregod_at_[hidden]
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