1 files changed, 72 insertions, 0 deletions
diff --git a/Examples/test-suite/constant_expr_c.i b/Examples/test-suite/constant_expr_c.i
new file mode 100644
index 000000000..41c474996
--- /dev/null
+++ b/Examples/test-suite/constant_expr_c.i
@@ -0,0 +1,72 @@
+%module constant_expr_c;
+/* Tests of constant expressions (C version). */
+
+%inline %{
+#if defined __GNUC__ && __GNUC__ >= 5
+// Suppress warnings about constant comparisons.
+# pragma GCC diagnostic ignored "-Wbool-compare"
+#endif
+
+#if defined(_MSC_VER)
+  #pragma warning(disable : 4804) // warning C4804: '<': unsafe use of type 'bool' in operation
+#endif
+
+/* % didn't work in SWIG 1.3.40 and earlier. */
+const int X = 123%7;
+#define FOO 12 % 9
+double d_array[12 % 9];
+
+/* `<` and `>` in constant expressions caused parse errors before SWIG 4.1.0.
+ * They're now supported if inside parentheses (and with some restrictions
+ * on the LHS of `<`.
+ */
+
+// Testcase from https://github.com/swig/swig/issues/635
+#define TEST_A 1
+#define TEST_B 2
+#define TEST_C (TEST_A < TEST_B)
+#define TEST_D (TEST_A > TEST_B)
+// These have been supported since 1.3.41.
+#define TEST_E (TEST_A <= TEST_B)
+#define TEST_F (TEST_A >= TEST_B)
+// For completeness
+#define TEST_G (TEST_A == TEST_B)
+#define TEST_H (TEST_A != TEST_B)
+
+// No warning
+#if (TEST_A < TEST_B)
+#define TEST_I 1
+#else
+#define TEST_I 0
+#endif
+
+/* Regression test for bug with losing parentheses around < and > operators,
+ * fixed in 4.2.0.
+ */
+#define XX (2<(2<2))
+#define YY (2>(2>2))
+int xx() { return (int)(XX); }
+int yy() { return (int)(YY); }
+
+/* sizeof didn't work on an expression before SWIG 4.1.0 except for cases where
+ * the expression was in parentheses and looked syntactically like a type (so
+ * sizeof(X) worked because X could be a type syntactically).
+ */
+const int s1a = sizeof(X); /* worked before 4.1.0 */
+//const int s1b = sizeof X; /* not currently supported */
+const int s2a = sizeof("a string" );
+const int s2b = sizeof "a string";
+const int s3a = sizeof('c');
+const int s3b = sizeof('c');
+const int s4a = sizeof(L"a wstring");
+const int s4b = sizeof L"a wstring";
+const int s5a = sizeof(L'C');
+const int s5b = sizeof L'C';
+const int s6a = sizeof(sizeof(X));
+const int s6b = sizeof sizeof(X);
+const int s7a = sizeof(3.14);
+const int s7b = sizeof 3.14;
+const int s8a = sizeof(2.1e-6);
+const int s8b = sizeof 2.1e-6;
+
+%}