Some tools for D

[Downs]

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Here's a collection of useful, generic tools code that extends the D
language. Originally written for Phobos, it should be easily adaptable
to Tango.

Includes:
 * tools.tests: Some simple test functions for unittests,
	used throughout the package itself
 * tools.iter: Iterator templates, including some useful
	default iterators such as the classical
	map, reduce, filter and zip as well as concat
 * tools.mrv: Multiple Return Values implementation, consisting
	of a TupleStruct and a MultiVariableHolder based on
	pointers (I've posted this one before, I believe)
 * tools.ext: Combines tools.iter and tools.mrv into TSzip,
	a zip iterator using tuple structs. Also allows chaining of
	delegates. Example (identity function):
		chain~(int e) { return e*2; }~(int e) { return e/2; }
	Furthermore, a Loop template based on chain, ifIs and mustBe,
	which simplify testing for an object's type. Example:
		class A { } class B : A { } A foo=new B;
		// evaluates to true
		ifIs(foo, (B b) { return true; }, { return false; });
	Furthermoar, an Integers iterator, used like Integers[5..50].
 * tools.threadpool: A really simple threadpool class.
	Also allows distributed foreach over an iterator.

Do not be disturbed by the total lack of comments - most of it is fairly
straightforward code which I simply didn't see any need to annotate.
Have fun!
 --downs
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