class<\/span> System<\/span>::<\/span>Decimal<\/span><\/div> instance_methods<\/span>(<\/span>false<\/span>)<\/span>.<\/span>each<\/span> do<\/span> |<\/span>name<\/span>|<\/span><\/div> mangled<\/span> =<\/span> '__'<\/span> +<\/span> name<\/span><\/div> alias_method<\/span>(<\/span>mangled<\/span>,<\/span> name<\/span>)<\/span><\/div> private<\/span> mangled<\/span><\/div> define_method<\/span>(<\/span>name<\/span>)<\/span> do<\/span> |*<\/span>args<\/span>|<\/span><\/div> puts<\/span> "method called: <\/span>#{<\/span>name<\/span>}<\/span>"<\/span><\/div> send<\/span> mangled<\/span>,<\/span> *<\/span>args<\/span><\/div> end<\/span><\/div> end<\/span><\/div>end<\/span><\/div> <\/div>
x<\/span>,<\/span> y<\/span> =<\/span> System<\/span>::<\/span>Decimal<\/span>.<\/span>new<\/span>(<\/span>1<\/span>),<\/span> System<\/span>::<\/span>Decimal<\/span>.<\/span>new<\/span>(<\/span>2<\/span>)<\/span><\/div>p<\/span> x<\/span> +<\/span> y<\/span> <\/div>#=> "method called: +"<\/span><\/div>p<\/span> x<\/span>.<\/span>CompareTo<\/span>(<\/span>y<\/span>)<\/span> <\/div>#=> "method called: compare_to"<\/span><\/div><\/pre><\/div>\n \n <\/div>\n\n