From c1461e75826c9d8488b644bd8de1503d29e7b938 Mon Sep 17 00:00:00 2001
From: Daviw Williams <david@volumesoffun.com>
Date: Fri, 24 May 2013 13:51:52 +0200
Subject: [PATCH] Added a null stream to suppress logging.

---
 .../include/PolyVoxCore/Impl/ErrorHandling.h    |  3 +++
 .../PolyVoxCore/source/Impl/ErrorHandling.cpp   | 17 ++++++++++++++---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/library/PolyVoxCore/include/PolyVoxCore/Impl/ErrorHandling.h b/library/PolyVoxCore/include/PolyVoxCore/Impl/ErrorHandling.h
index d40a561a..b5100b25 100644
--- a/library/PolyVoxCore/include/PolyVoxCore/Impl/ErrorHandling.h
+++ b/library/PolyVoxCore/include/PolyVoxCore/Impl/ErrorHandling.h
@@ -68,6 +68,9 @@ freely, subject to the following restrictions:
 
 namespace PolyVox
 {
+	/// Get a stream which will consume all input without outputting anything.
+	std::ostream* getNullStream(void);
+
 	std::ostream& logTrace(void);
 	std::ostream& logDebug(void);
 	std::ostream& logInfo(void);
diff --git a/library/PolyVoxCore/source/Impl/ErrorHandling.cpp b/library/PolyVoxCore/source/Impl/ErrorHandling.cpp
index cce96bef..a3c2dedc 100644
--- a/library/PolyVoxCore/source/Impl/ErrorHandling.cpp
+++ b/library/PolyVoxCore/source/Impl/ErrorHandling.cpp
@@ -25,10 +25,21 @@ freely, subject to the following restrictions:
 
 namespace PolyVox
 {
+	/** 
+	 * \return A pointer to the null stream.
+	 */
+	std::ostream* getNullStream(void)
+	{
+		// Passing zero to the stream constructor guarentees it will discard all input. See
+		// here http://stackoverflow.com/a/8244052 and here http://stackoverflow.com/a/6240980
+		static std::ostream s_NullStream = std::ostream(0);
+		return &s_NullStream;
+	}
+
 	// Trace stream for logging
 	std::ostream*& getTraceStreamInstance()
 	{
-		static std::ostream* s_pTraceStream = &(std::cerr);
+		static std::ostream* s_pTraceStream = getNullStream();
 		return s_pTraceStream;
 	}
 
@@ -45,7 +56,7 @@ namespace PolyVox
 	// Debug stream for logging
 	std::ostream*& getDebugStreamInstance()
 	{
-		static std::ostream* s_pDebugStream = &(std::cerr);
+		static std::ostream* s_pDebugStream = getNullStream();
 		return s_pDebugStream;
 	}
 
@@ -62,7 +73,7 @@ namespace PolyVox
 	// Info stream for logging
 	std::ostream*& getInfoStreamInstance()
 	{
-		static std::ostream* s_pInfoStream = &(std::cerr);
+		static std::ostream* s_pInfoStream = &(std::cout);
 		return s_pInfoStream;
 	}