add Checkpoint

stepmania/src/RageLog.cpp

@@ -233,3 +233,19 @@ void RageLog::UnmapLog(const CString &key)
 {
 	LogMaps.erase(key);
 }
+
+Checkpoint_::Checkpoint_(CString key_, int n, CString fmt, ...)
+{
+	key = ssprintf("%s:%i", key_.c_str(), n);
+
+    va_list	va;
+    va_start(va, fmt);
+	LOG->MapLog( key, vssprintf(fmt, va) );
+    va_end(va);
+}
+
+Checkpoint_::~Checkpoint_()
+{
+	LOG->UnmapLog( key );
+}
+

stepmania/src/RageLog.h

@@ -37,6 +37,15 @@ private:
 	void UpdateMappedLog();
 };
 
-extern RageLog*	LOG;	// global and accessable from anywhere in our program
+/* Mapped log entry that's deleted on dtor.  Note that this isn't extremely
+ * fast (like VDCHECKPOINT); don't use it in inner loops. */
+struct Checkpoint_
+{
+	CString key;
+	Checkpoint_(CString key, int n, CString fmt, ...);
+	~Checkpoint_();
+};
+#define Checkpoint(t) Checkpoint_ CP_( __FUNCTION__, __LINE__, t )
 
+extern RageLog*	LOG;	// global and accessable from anywhere in our program
 #endif