memory_pointer_plus.rb

require 'rubygems'
require 'ffi'

pointer = FFI::MemoryPointer.new(:char, 3)
puts "pointer: #{pointer.inspect} (#{pointer.type_size})"
# => pointer: #<MemoryPointer address=0x1713e50 size=3> (1)

first = pointer + pointer.type_size
puts "first: #{first.inspect}"
# => first: #<Native Pointer address=0x1713e51>

second = first + pointer.type_size
puts "second: #{second.inspect}"
# => second: #<Native Pointer address=0x1713e52>

first = pointer[1]
puts "first: #{first.inspect}"
# => first: #<Native Pointer address=0x1713e51>

second = first[1]
puts "second: #{second.inspect}"
# => test_plus.rb:16: undefined method `[]' for #<Native Pointer address=0x1713e51> (NoMethodError)