From 31f58738f21f5d3f68eff3b506c49a9db47c9229 Mon Sep 17 00:00:00 2001
From: Ryan Pavlik <ryan@sensics.com>
Date: Wed, 3 Jan 2018 20:18:38 -0600
Subject: [PATCH] Add a few asserts. NFC.

---
 src/mesh.cpp        | 4 ++--
 src/srf/surface.cpp | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/mesh.cpp b/src/mesh.cpp
index c030473..59b4355 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -289,8 +289,8 @@ void SMesh::MakeFromDifferenceOf(SMesh *a, SMesh *b) {
 }
 
 void SMesh::MakeFromCopyOf(SMesh *a) {
-    int i;
-    for(i = 0; i < a->l.n; i++) {
+    ssassert(this != a, "Can't make from copy of self");
+    for(int i = 0; i < a->l.n; i++) {
         AddTriangle(&(a->l.elem[i]));
     }
 }
diff --git a/src/srf/surface.cpp b/src/srf/surface.cpp
index 33f0d4a..fcd9623 100644
--- a/src/srf/surface.cpp
+++ b/src/srf/surface.cpp
@@ -829,6 +829,7 @@ void SShell::MakeFromRevolutionOf(SBezierLoopSet *sbls, Vector pt, Vector axis,
 }
 
 void SShell::MakeFromCopyOf(SShell *a) {
+    ssassert(this != a, "Can't make from copy of self");
     MakeFromTransformationOf(a,
         Vector::From(0, 0, 0), Quaternion::IDENTITY, 1.0);
 }