[Issue 4231] Solitary opUnary Postincrement and Postdecrement user defined operators are broken.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4231


Don <clugdbug at yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #10 from Don <clugdbug at yahoo.com.au> 2010-06-08 00:01:20 PDT ---
This patch only stops the side effect message, it doesn't turn x++; into ++x;
Note that this patch deals with more difficult cases such as:

struct Foo{
    int opUnary(string op)() { return 1; }
}

void main() {
    Foo foo;
    int w;
    ++w, foo++;
}
----

Index: expression.c
===================================================================
--- expression.c    (revision 526)
+++ expression.c    (working copy)
@@ -8520,6 +8520,14 @@

 int CommaExp::checkSideEffect(int flag)
 {
+    // Check for compiler-generated code of the form  auto __tmp, e, __tmp;
+    // In such cases, only check e for side effect (it's OK for __tmp to have
no side effect).
+    CommaExp * firstComma = this;
+    while (firstComma->e1->op == TOKcomma)
+        firstComma = (CommaExp *)firstComma->e1;
+    if (firstComma->e1->op == TOKdeclaration && e2->op == TOKvar)
+        return e1->checkSideEffect(flag);
+
     if (flag == 2)
         return e1->checkSideEffect(2) || e2->checkSideEffect(2);
     else

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