pointerof expression returns a Pointer that points to the contents of a variable or instance variable.
An example with a variable:
a = 1 ptr = pointerof(a) ptr.value = 2 a # => 2
An example with an instance variable:
class Point def initialize(@x : Int32, @y : Int32) end def x @x end def x_ptr pointerof(@x) end end point = Point.new 1, 2 ptr = point.x_ptr ptr.value = 10 point.x # => 10
pointerof involves pointers, it is considered unsafe.
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