From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-12-14 19:58:38
At my request, Doug Gregor very kindly (and elegantly!) implemented
reference semantics for boost::function. Now the docs say:
---
References to Functions
In some cases it is expensive (or semantically incorrect) to have
Boost.Function clone a function object. In such cases, it is possible to
request that Boost.Function keep only a reference to the actual function
object. This is done using the ref and cref functions to wrap a reference to
a function object:
stateful_type a_function_object;
boost::function<int, int> f;
f = ref(a_function_object);
boost::function<int, int> f2(f);
Here, f will not make a copy of a_function_object, nor will f2 when it is
targeted to f's reference to a_function_object. Additionally, when using
references to function objects, Boost.Function will not throw exceptions
during assignment.
---
The reason for my request, however was that I wanted to avoid exceptions
during construction. Is that already implemented, or not?
The message at: http://groups.yahoo.com/group/boost/message/21065
seems to indicate that it is.
-Dave
===================================================
David Abrahams, C++ library designer for hire
resume: http://users.rcn.com/abrahams/resume.html
C++ Booster (http://www.boost.org)
email: david.abrahams_at_[hidden]
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