[libstdc++ patch] TR1 result_of implementation

[Douglas Gregor]

This patch adds support for result_of (section 3.4 of TR1). This is the 
library-only solution that does not make sure of typeof. If we get a 
reference-preserving typeof (or can fake it), we should consider replacing 
this implementation with one that uses the reference-preserving typeof 
directly.

reference_wrapper's result_type and operator() should be easy to implement 
now.

All function object tests pass on i686-pc-linux-gnu; full test suite is 
running right. Okay to commit if everything passes?

 Doug
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2005-02-27  Douglas Gregor  <doug.gregor@gmail.com>

	* include/tr1/function (result_of): New class template.
	* include/tr1/functional/iterator.h: Implementation of TR1 
	result_of.
	* testsuite/tr1/3_function_objects/result_of.cc: New test 
	of std::tr1::result_of.