decltype extravaganza

OK, I thought C++11 was cool, but I am ending up writing a code like this:

	row_assign_ = nomad_allocator<std::remove_pointer<decltype(row_assign_)>::type>().allocate(num_rows_);
	// is this really better than
	row_assign_ = my_allocator<int>().allocate(num_rows_);
	// ...?

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