Differences

This shows you the differences between two versions of the page.

--- multiple_return_values [2019/04/19 21:22] – korshun
+++ multiple_return_values [2019/04/22 00:32] (current) – korshun
@@ Line 1: / Line 1: @@
-====== Multiple return values convention ======
+====== Multiple return values ======
-Some ACSUtils functions return multiple values (e.g. [[math#vector_math|vector math functions]]). ACS doesn't support returning multiple values from a function.
+Some ACSUtils functions return multiple values (e.g. [[math#vector_math|vector math functions]], but also some non-math functions). ACS doesn't support returning multiple values from a function.
 ACSUtils uses a convention to fake returning multiple values from a function. The convention is as follows: there are 8 global variables with names ''r1'' through ''r8''. If a function returns multiple values, it actually returns no value and writes the first "returned" value to ''r1'', the second one to ''r2'', and so on.
@@ Line 31: / Line 31: @@
 SomeOtherFunction(a);
 </code>
+</note>
+<note important>Another shortcoming is that ''r1''..''r8'' are declared ''raw'' in BCC to be able to accomodate any type of return value, and thus bypass [[strict typing]], even if it's enabled.
+<code>
+ParseFixed("1.0", 10);
+int error = r1;
+int result = r2; // no compiler error, despite assigning a fixed to int
+</code>
 </note>

ACSUtils Wiki