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diff --git a/intl/icu/source/i18n/significantdigitinterval.h b/intl/icu/source/i18n/significantdigitinterval.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2015, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* significantdigitinterval.h
+*
+* created on: 2015jan6
+* created by: Travis Keep
+*/
+
+#ifndef __SIGNIFICANTDIGITINTERVAL_H__
+#define __SIGNIFICANTDIGITINTERVAL_H__
+
+#include "unicode/uobject.h"
+#include "unicode/utypes.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * An interval of allowed significant digit counts.
+ */
+class U_I18N_API SignificantDigitInterval : public UMemory {
+public:
+
+    /**
+     * No limits on significant digits.
+     */
+    SignificantDigitInterval()
+            : fMax(INT32_MAX), fMin(0) { }
+
+    /**
+     * Make this instance have no limit on significant digits.
+     */
+    void clear() {
+        fMin = 0;
+        fMax = INT32_MAX;
+    }
+
+    /**
+     * Returns TRUE if this object is equal to rhs.
+     */
+    UBool equals(const SignificantDigitInterval &rhs) const {
+        return ((fMax == rhs.fMax) && (fMin == rhs.fMin));
+    }
+
+    /**
+     * Sets maximum significant digits. 0 or negative means no maximum.
+     */
+    void setMax(int32_t count) {
+        fMax = count <= 0 ? INT32_MAX : count;
+    }
+
+    /**
+     * Get maximum significant digits. INT32_MAX means no maximum.
+     */
+    int32_t getMax() const {
+        return fMax;
+    }
+
+    /**
+     * Sets minimum significant digits. 0 or negative means no minimum.
+     */
+    void setMin(int32_t count) {
+        fMin = count <= 0 ? 0 : count;
+    }
+
+    /**
+     * Get maximum significant digits. 0 means no minimum.
+     */
+    int32_t getMin() const {
+        return fMin;
+    }
+
+    /**
+     * Returns TRUE if this instance represents no constraints on significant
+     * digits.
+     */
+    UBool isNoConstraints() const {
+        return fMin == 0 && fMax == INT32_MAX;
+    }
+
+private:
+    int32_t fMax;
+    int32_t fMin;
+};
+
+U_NAMESPACE_END
+
+#endif  // __SIGNIFICANTDIGITINTERVAL_H__