testeq – An equal­ity test for use in Meta­Post

This file pro­vides a gen­eral equal­ity test macro for ob­jects of any type based on code from Ap­pendix D of The Meta­font book, but adapted for Me­ta­post. Un­for­tu­nately it is no longer fully gen­eral, be­cause Me­ta­post lacks the bitmap-ori­ented op­er­a­tions like cull and to­tal­weight, which are needed when test­ing for the equal­ity of two pic­tures.
A par­tic­u­lar use­ful fea­ture of this pack­age is the patheq macro to test for equal­ity of two paths. This might prove handy when pro­cess­ing data files with the Me­ta­post graph pack­age, that con­tain data for an un­known num­ber of paths sep­a­rated by blank lines. In that case one might use patheq to check whether the last path read is ac­tu­ally the same as the first one, hav­ing started over from the be­gin­ning.