Fix handling of array whose size contains <<

Fixes https://sourceforge.net/p/swig/bugs/983/

CHANGES.current

@@ -7,6 +7,10 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2022-07-27: olly
+	    https://sourceforge.net/p/swig/bugs/983/
+	    Fix handling of array whose size contains a left shift operator (<<).
+
 2022-07-27: ZackerySpytz, olly
 	    #1678 Support parsing C++20 templated lambdas.
 

Examples/test-suite/arrays.i

@@ -73,4 +73,8 @@ typedef struct {
 cartPosition_t p;
 } CartPoseData_t;
 
+/* Test left shift in array size doesn't trigger "Bad template type" error.
+ * Regression test for https://sourceforge.net/p/swig/bugs/983/ */
+int array_shifted_size[(1<<2)];
+
 %}

Examples/test-suite/php/arrays_runme.php

@@ -4,7 +4,7 @@ require "tests.php";
 
 check::functions(array('fn_taking_arrays','newintpointer','setintfrompointer','getintfrompointer','array_pointer_func'));
 check::classes(array('arrays','SimpleStruct','ArrayStruct','CartPoseData_t'));
-check::globals(array());
+check::globals(array('array_shifted_size'));
 
 $ss=new simplestruct();
 check::classname('simplestruct',$ss);

Source/Swig/typesys.c

@@ -1702,7 +1702,9 @@ void SwigType_remember_clientdata(const SwigType *t, const_String_or_char_ptr cl
 
   if (t) {
     char *ct = Char(t);
-    if (strchr(ct, '<') && !(strstr(ct, "<("))) {
+    const char *lt = strchr(ct, '<');
+    /* Allow for `<<` operator in constant expression for array size. */
+    if (lt && lt[1] != '(' && lt[1] != '<') {
       Printf(stdout, "Bad template type passed to SwigType_remember: %s\n", t);
       assert(0);
     }