ICU 56 update step 1

source/i18n/fmtableimp.h

Index: source/i18n/fmtableimp.h
diff --git a/source/i18n/fmtableimp.h b/source/i18n/fmtableimp.h
index db7aa3e9e2ebbf062894b6e9f8b408ab81465a9c..b64274d568fb4f82eec30161adcb1308b6d53362 100644
--- a/source/i18n/fmtableimp.h
+++ b/source/i18n/fmtableimp.h
@@ -1,6 +1,6 @@
 /*
 *******************************************************************************
-* Copyright (C) 2010-2012, International Business Machines Corporation and    *
+* Copyright (C) 2010-2014, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
@@ -8,6 +8,9 @@
 #ifndef FMTABLEIMP_H
 #define FMTABLEIMP_H
 
+#include "digitlst.h"
+
+U_NAMESPACE_BEGIN
 
 /**
  * @internal
@@ -19,6 +22,15 @@ struct FmtStackData {
   //                         192 total
 };
 
+/** 
+ * Maximum int64_t value that can be stored in a double without chancing losing precision.
+ *   IEEE doubles have 53 bits of mantissa, 10 bits exponent, 1 bit sign.
+ *   IBM Mainframes have 56 bits of mantissa, 7 bits of base 16 exponent, 1 bit sign.
+ * Define this constant to the smallest value from those for supported platforms.
+ * @internal
+ */
+static const int64_t MAX_INT64_IN_DOUBLE = 0x001FFFFFFFFFFFFFLL;
 
+U_NAMESPACE_END
 
 #endif