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From: shunsuke (pstade.mb_at_[hidden])
Date: 2007-11-21 10:58:41

Dean Michael Berris wrote:
> Another is the issue of conversion, and enforcement of concepts on the
> type T. When you want to ensure that T is default constructable and
> assignable, and you want to force conversions of objects passed to
> your function to T, you'd have code that looks like:
> template <typename TReal>
> struct polymorphic_conversion_forcer {
> template <typename TDeduced>
> void function(TDeduced const & t) {
> TReal r = t; // TReal should be default constructable and
> assignable, and TDeduced should be convertible to TReal
> };
> };

Apart from the historical reason,
ostream_iterator seems to fall into anti-pattern: one name, two functionality.
The enforcement part could be delegated to another output iterator adaptor.

My current solution is something like this:
   copy(stream_read<char>(std::in), converter<std::string>() |= stream_writer(std::cout));


Shunsuke Sogame

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