Hi Vladimir, "Vladimir Prus" <ghost@cs.msu.su> wrote in message news:c5dcug$67c$1@sea.gmane.org...
Thorsten Ottosen wrote:
won't boost::ref <> "solve" this. (don't bind use &?)
No and no.
(a) My comments about boost::bind comes from http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1385.htm
But bind's reference docs seems to use by-value.
Looking at the code, it seems boost::bind uses non-const reference for operator() -- the actual forwarding -- and by-value for arguments to 'bind' itself.
I must admit I don't get that. I extended rhe example to show the problems (see attachment). As you point out, bind() *silently* compiles code that would not compile if one called the original function with those arguments. IMO, *very* trouplesome. Could the authors of bind/function please comment on why that has been allowed?
So, you should add pass by non-const reference to the list of alternatives.
yeah, that's one of the alternatives discussed in Howard and Dave's paper..
What I think about it is that const-reference prevents you from passing non-const references to constructors of objects you put to container.
only in the sense that you need to use boost::ref<>
OTOH, with non-const references you'd break the passing of integer literals --
any "literal", in fact.
which is the point of the library.
yes.
Maybe, you really should support ref<> for passing non-const references.
Depends on what you mean by support :-) It's already supported by using ref<>. I think that is ok; afterall, reference arguments should not be used that much thoughout code. br Thorsten begin 666 ref.cpp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` end