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Idiom #306 Ensure list capacity

Preallocate memory in the list x for a minimum total capacity of 200 elements.

This is not possible in all languages. It is only meant as a performance optimization, should not change the length of x, and should not have any effect on correctness.

with Ada.Containers.Vectors;
declare
   X : Vector;
begin
   Reserve_Capacity (X, Capacity => 200);
end;
if cap(x) < 200 {
	y := make([]T, len(x), 200)
	copy(y, x)
	x = y
}
Uses Classes;
x.capacity := 200;

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