[array] - array_vector

I've a got a small utility class that is a cross between boost::array and std::vector for when I only have a
compile time constant max things.  This is beats to complexity of fighting with custom allocators/pools.
	const unsigned n=100;
	Thing array[n];
	unsigned count=0;
goes to:
	array_vector<Thing,100> things;

It's stl compliant and should drop in anywhere you've got a vector.  Like vector and unlike boost::array (or
regular array) 100 Things are not constructed.

Have I reinvented something in boost?  Should I submit it?

Also related to this.  There are a class of problems where n is known only on runtime, but you still only need it
in a  certain scope.  gcc (C99 standard) allows variable length arrays on the stack.  Does anyone know if that
is allowed in C++11?

What would think about something like this?
	unsigned n=readInt();
	placeholder<Thing> bufffer[n];      //variable length data on stack
	buffer_vector<Thing> v(buffer,n);

Chris

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