X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Fexam_misc.cpp;h=849dc5adabd666ba1009e68ca18922fe926bc06b;hp=412f5d94122b41ac3b9c7581130db3ad6256cc8e;hb=da2ce481c6a4c5f79e3c2d888bbab45b9a476bd4;hpb=ae05ab3fa15d36e2ca8fa45b4e363e5bfb84da2a;ds=sidebyside

diff --git a/check/exam_misc.cpp b/check/exam_misc.cpp
index 412f5d94..849dc5ad 100644
--- a/check/exam_misc.cpp
+++ b/check/exam_misc.cpp
@@ -3,7 +3,7 @@
  */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2002 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -129,6 +129,103 @@ static unsigned exam_sqrfree(void)
 	return result;
 }
 
+/* Arithmetic Operators should behave just as one expects from built-in types.
+ * When somebody screws up the operators this routine will most probably fail
+ * to compile.  Unfortunately we can only test the stuff that is allowed, not
+ * what is forbidden (e.g. e1+e2 = 42) since that must not compile.  :-(   */
+static unsigned exam_operator_semantics(void)
+{
+	unsigned result = 0;
+	ex e1, e2;
+	int i1, i2;
+	
+	// Assignment should not return const ex though it may be obfuscated:
+	e1 = 7; e2 = 4;
+	i1 = 7; i2 = 4;
+	(e1 = e2) = 2;
+	(i1 = i2) = 2;
+	if (e1!=i1 || e2!=i2) {
+		clog << "Semantics of ex::operator=() screwed." << endl;
+		++result;
+	}
+	(e1 += e2) = 2;
+	(i1 += i2) = 2;
+	if (e1!=i1 || e2!=i2) {
+		clog << "Semantics of ex::operator=() screwed." << endl;
+		++result;
+	}
+	(e1 -= e2) = 2;
+	(i1 -= i2) = 2;
+	if (e1!=i1 || e2!=i2) {
+		clog << "Semantics of ex::operator=() screwed." << endl;
+		++result;
+	}
+	
+	// Prefix/postfix increment/decrement behaviour:
+	e1 = 7; e2 = 4;
+	i1 = 7; i2 = 4;
+	e1 = (--e2 = 2)++;
+	i1 = (--i2 = 2)++;
+	if (e1!=i1 || e2!=i2) {
+		clog << "Semantics of increment/decrement operators screwed." << endl;
+		++result;
+	}
+	e1 = (++e2 = 2)--;
+	i1 = (++i2 = 2)--;
+	if (e1!=i1 || e2!=i2) {
+		clog << "Semantics of increment/decrement operators screwed." << endl;
+		++result;
+	}
+	
+	// prefix increment/decrement must return an lvalue (contrary to postfix):
+	e1 = 7; e2 = 4;
+	i1 = 7; i2 = 4;
+	--++----e1;  ++(++++++++(++++e2));
+	--++----i1;  ++(++++++++(++++i2));
+	if (e1!=i1 || e2!=i2) {
+		clog << "Semantics of prefix increment/decrement operators screwed." << endl;
+		++result;
+	}
+	
+	// This one has a good chance of detecting problems in self-assignment:
+	// (which incidentally was severely broken from version 0.7.3 to 0.8.2).
+	ex selfprobe = numeric("65536");
+	selfprobe = selfprobe;
+	if (!is_exactly_a<numeric>(selfprobe)) {
+		clog << "ex (of numeric) after self-assignment became " << selfprobe << endl;
+		++result;
+	}
+	
+	return result;
+}
+
+/* This checks whether subs() works as intended in some special cases. */
+static unsigned exam_subs(void)
+{
+	unsigned result = 0;
+	symbol x("x");
+	ex e1, e2;
+
+	// This used to fail in GiNaC 1.0.5 because it first substituted
+	// x+1 -> (x-1)+1 -> x, and then substituted again x -> x-1, giving
+	// the wrong result
+	e1 = x+1;
+	e2 = e1.subs(x == x-1);
+	if (!e2.is_equal(x)) {
+		clog << "(x+1).subs(x==x-1) erroneously returned " << e2 << " instead of x" << endl;
+		++result;
+	}
+
+	e1 = sin(1+sin(x));
+	e2 = e1.subs(sin(wild()) == cos(wild()));
+	if (!e2.is_equal(cos(1+cos(x)))) {
+		clog << "sin(1+sin(x)).subs(sin($1)==cos($1)) erroneously returned " << e2 << " instead of cos(1+cos(x))" << endl;
+		++result;
+	}
+
+	return result;
+}
+
 unsigned exam_misc(void)
 {
 	unsigned result = 0;
@@ -140,6 +237,8 @@ unsigned exam_misc(void)
 	result += exam_expand_subs2();  cout << '.' << flush;
 	result += exam_expand_power(); cout << '.' << flush;
 	result += exam_sqrfree(); cout << '.' << flush;
+	result += exam_operator_semantics(); cout << '.' << flush;
+	result += exam_subs(); cout << '.' << flush;
 	
 	if (!result) {
 		cout << " passed " << endl;