gistfile1.rb

class SomeMethod
  extend FFI::Library
  
  attach_function :cmethod, :pointer
  
  def mystical_value=(value)
    @value = FFI::MemoryPointer.new(:string, value)
    cmethod(@value)
  end
end

class MethodMethod2
  extend FFI::Library
  ffi_lib FFI::Library::LIBC
  
  attach_function :malloc, [:size_t], :pointer
  attach_function :cmethod, :pointer
  
  def mystical_value=(value)
    ptr = LibC.malloc(value.size)
    ptr.write_string(value)
    cmethod(ptr)
  end
end