Feature/memory arena (#631)

* First pass at MemoryArena.

* First pass at RandomGenerator.

* Extract TestContext into external source file.

* Fix warning on printf.

* Use enum classes for Test enums.
OutputMode -> TestOutputMode.

* First pass at FreeList unit test.

* Auto registering tests.
Improvements to RandomGenerator.

* Remove the need for unitTest headers - cos can use registering.

* Added unitTest for MemoryArena.

* Do unit tests.

* Fix typo.

1 files changed, 13 insertions, 1 deletions

diff --git a/source/core/slang-string-util.h b/source/core/slang-string-util.h
index bae576370..fc3258490 100644
--- a/source/core/slang-string-util.h
+++ b/source/core/slang-string-util.h
@@ -4,14 +4,26 @@
 #include "slang-string.h"
 #include "list.h"
 
+#include <stdarg.h>
+
 namespace Slang {
 
 struct StringUtil
 {
+        /// Split in, by specified splitChar into slices out
+        /// Slices contents will directly address into in, so contents will only stay valid as long as in does.
     static void split(const UnownedStringSlice& in, char splitChar, List<UnownedStringSlice>& slicesOut);
+
+        /// Appends formatted string with args into buf
+    static void append(const char* format, va_list args, StringBuilder& buf);
+
+        /// Appends the formatted string with specified trailing args
+    static void appendFormat(StringBuilder& buf, const char* format, ...);
+
+        /// Create a string from the format string applying args (like sprintf)
+    static String makeStringWithFormat(const char* format, ...);
 };
 
 } // namespace Slang
 
-
 #endif // SLANG_STRING_UTIL_H