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diff --git a/intl/icu/source/common/uvector.cpp b/intl/icu/source/common/uvector.cpp
new file mode 100644
index 0000000000..f93d73a3c6
--- /dev/null
+++ b/intl/icu/source/common/uvector.cpp
@@ -0,0 +1,566 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+* Copyright (C) 1999-2013, International Business Machines Corporation and
+* others. All Rights Reserved.
+******************************************************************************
+*   Date        Name        Description
+*   10/22/99    alan        Creation.
+**********************************************************************
+*/
+
+#include "uvector.h"
+#include "cmemory.h"
+#include "uarrsort.h"
+#include "uelement.h"
+
+U_NAMESPACE_BEGIN
+
+constexpr int32_t DEFAULT_CAPACITY = 8;
+
+/*
+ * Constants for hinting whether a key is an integer
+ * or a pointer.  If a hint bit is zero, then the associated
+ * token is assumed to be an integer. This is needed for iSeries
+ */
+constexpr int8_t HINT_KEY_POINTER = 1;
+constexpr int8_t HINT_KEY_INTEGER = 0;
+ 
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UVector)
+
+UVector::UVector(UErrorCode &status) :
+        UVector(nullptr, nullptr, DEFAULT_CAPACITY, status) {
+}
+
+UVector::UVector(int32_t initialCapacity, UErrorCode &status) :
+        UVector(nullptr, nullptr, initialCapacity, status) {
+}
+
+UVector::UVector(UObjectDeleter *d, UElementsAreEqual *c, UErrorCode &status) :
+        UVector(d, c, DEFAULT_CAPACITY, status) {
+}
+
+UVector::UVector(UObjectDeleter *d, UElementsAreEqual *c, int32_t initialCapacity, UErrorCode &status) :
+    deleter(d),
+    comparer(c)
+{
+    if (U_FAILURE(status)) {
+        return;
+    }
+    // Fix bogus initialCapacity values; avoid malloc(0) and integer overflow
+    if ((initialCapacity < 1) || (initialCapacity > (int32_t)(INT32_MAX / sizeof(UElement)))) {
+        initialCapacity = DEFAULT_CAPACITY;
+    }
+    elements = (UElement *)uprv_malloc(sizeof(UElement)*initialCapacity);
+    if (elements == nullptr) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+    } else {
+        capacity = initialCapacity;
+    }
+}
+
+UVector::~UVector() {
+    removeAllElements();
+    uprv_free(elements);
+    elements = nullptr;
+}
+
+/**
+ * Assign this object to another (make this a copy of 'other').
+ * Use the 'assign' function to assign each element.
+ */
+void UVector::assign(const UVector& other, UElementAssigner *assign, UErrorCode &ec) {
+    if (ensureCapacity(other.count, ec)) {
+        setSize(other.count, ec);
+        if (U_SUCCESS(ec)) {
+            for (int32_t i=0; i<other.count; ++i) {
+                if (elements[i].pointer != nullptr && deleter != nullptr) {
+                    (*deleter)(elements[i].pointer);
+                }
+                (*assign)(&elements[i], &other.elements[i]);
+            }
+        }
+    }
+}
+
+// This only does something sensible if this object has a non-null comparer
+bool UVector::operator==(const UVector& other) const {
+    U_ASSERT(comparer != nullptr);
+    if (count != other.count) return false;
+    if (comparer != nullptr) {
+        // Compare using this object's comparer
+        for (int32_t i=0; i<count; ++i) {
+            if (!(*comparer)(elements[i], other.elements[i])) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+void UVector::addElement(void* obj, UErrorCode &status) {
+    U_ASSERT(deleter == nullptr);
+    if (ensureCapacity(count + 1, status)) {
+        elements[count++].pointer = obj;
+    }
+}
+
+void UVector::adoptElement(void* obj, UErrorCode &status) {
+    U_ASSERT(deleter != nullptr);
+    if (ensureCapacity(count + 1, status)) {
+        elements[count++].pointer = obj;
+    } else {
+        (*deleter)(obj);
+    }
+}
+void UVector::addElement(int32_t elem, UErrorCode &status) {
+    U_ASSERT(deleter == nullptr);  // Usage error. Mixing up ints and pointers.
+    if (ensureCapacity(count + 1, status)) {
+        elements[count].pointer = nullptr;     // Pointers may be bigger than ints.
+        elements[count].integer = elem;
+        count++;
+    }
+}
+
+void UVector::setElementAt(void* obj, int32_t index) {
+    if (0 <= index && index < count) {
+        if (elements[index].pointer != nullptr && deleter != nullptr) {
+            (*deleter)(elements[index].pointer);
+        }
+        elements[index].pointer = obj;
+    } else {
+        /* index out of range */
+        if (deleter != nullptr) {
+            (*deleter)(obj);
+        }
+    }
+}
+
+void UVector::setElementAt(int32_t elem, int32_t index) {
+    U_ASSERT(deleter == nullptr);  // Usage error. Mixing up ints and pointers.
+    if (0 <= index && index < count) {
+        elements[index].pointer = nullptr;
+        elements[index].integer = elem;
+    }
+    /* else index out of range */
+}
+
+void UVector::insertElementAt(void* obj, int32_t index, UErrorCode &status) {
+    if (ensureCapacity(count + 1, status)) {
+        if (0 <= index && index <= count) {
+            for (int32_t i=count; i>index; --i) {
+                elements[i] = elements[i-1];
+            }
+            elements[index].pointer = obj;
+            ++count;
+        } else {
+            /* index out of range */
+            status = U_ILLEGAL_ARGUMENT_ERROR;
+        }
+    }
+    if (U_FAILURE(status) && deleter != nullptr) {
+        (*deleter)(obj);
+    }
+}
+
+void UVector::insertElementAt(int32_t elem, int32_t index, UErrorCode &status) {
+    U_ASSERT(deleter == nullptr);  // Usage error. Mixing up ints and pointers.
+    // must have 0 <= index <= count
+    if (ensureCapacity(count + 1, status)) {
+        if (0 <= index && index <= count) {
+            for (int32_t i=count; i>index; --i) {
+                elements[i] = elements[i-1];
+            }
+            elements[index].pointer = nullptr;
+            elements[index].integer = elem;
+            ++count;
+        } else {
+            /* index out of range */
+            status = U_ILLEGAL_ARGUMENT_ERROR;
+        }
+    }
+}
+
+void* UVector::elementAt(int32_t index) const {
+    return (0 <= index && index < count) ? elements[index].pointer : 0;
+}
+
+int32_t UVector::elementAti(int32_t index) const {
+    return (0 <= index && index < count) ? elements[index].integer : 0;
+}
+
+UBool UVector::containsAll(const UVector& other) const {
+    for (int32_t i=0; i<other.size(); ++i) {
+        if (indexOf(other.elements[i]) < 0) {
+            return false;
+        }
+    }
+    return true;
+}
+
+UBool UVector::containsNone(const UVector& other) const {
+    for (int32_t i=0; i<other.size(); ++i) {
+        if (indexOf(other.elements[i]) >= 0) {
+            return false;
+        }
+    }
+    return true;
+}
+
+UBool UVector::removeAll(const UVector& other) {
+    UBool changed = false;
+    for (int32_t i=0; i<other.size(); ++i) {
+        int32_t j = indexOf(other.elements[i]);
+        if (j >= 0) {
+            removeElementAt(j);
+            changed = true;
+        }
+    }
+    return changed;
+}
+
+UBool UVector::retainAll(const UVector& other) {
+    UBool changed = false;
+    for (int32_t j=size()-1; j>=0; --j) {
+        int32_t i = other.indexOf(elements[j]);
+        if (i < 0) {
+            removeElementAt(j);
+            changed = true;
+        }
+    }
+    return changed;
+}
+
+void UVector::removeElementAt(int32_t index) {
+    void* e = orphanElementAt(index);
+    if (e != nullptr && deleter != nullptr) {
+        (*deleter)(e);
+    }
+}
+
+UBool UVector::removeElement(void* obj) {
+    int32_t i = indexOf(obj);
+    if (i >= 0) {
+        removeElementAt(i);
+        return true;
+    }
+    return false;
+}
+
+void UVector::removeAllElements() {
+    if (deleter != nullptr) {
+        for (int32_t i=0; i<count; ++i) {
+            if (elements[i].pointer != nullptr) {
+                (*deleter)(elements[i].pointer);
+            }
+        }
+    }
+    count = 0;
+}
+
+UBool   UVector::equals(const UVector &other) const {
+    int      i;
+
+    if (this->count != other.count) {
+        return false;
+    }
+    if (comparer == nullptr) {
+        for (i=0; i<count; i++) {
+            if (elements[i].pointer != other.elements[i].pointer) {
+                return false;
+            }
+        }
+    } else {
+        UElement key;
+        for (i=0; i<count; i++) {
+            key.pointer = &other.elements[i];
+            if (!(*comparer)(key, elements[i])) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+
+
+int32_t UVector::indexOf(void* obj, int32_t startIndex) const {
+    UElement key;
+    key.pointer = obj;
+    return indexOf(key, startIndex, HINT_KEY_POINTER);
+}
+
+int32_t UVector::indexOf(int32_t obj, int32_t startIndex) const {
+    UElement key;
+    key.integer = obj;
+    return indexOf(key, startIndex, HINT_KEY_INTEGER);
+}
+
+int32_t UVector::indexOf(UElement key, int32_t startIndex, int8_t hint) const {
+    if (comparer != nullptr) {
+        for (int32_t i=startIndex; i<count; ++i) {
+            if ((*comparer)(key, elements[i])) {
+                return i;
+            }
+        }
+    } else {
+        for (int32_t i=startIndex; i<count; ++i) {
+            /* Pointers are not always the same size as ints so to perform
+             * a valid comparison we need to know whether we are being
+             * provided an int or a pointer. */
+            if (hint & HINT_KEY_POINTER) {
+                if (key.pointer == elements[i].pointer) {
+                    return i;
+                }
+            } else {
+                if (key.integer == elements[i].integer) {
+                    return i;
+                }
+            }
+        }
+    }
+    return -1;
+}
+
+UBool UVector::ensureCapacity(int32_t minimumCapacity, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return false;
+    }
+    if (minimumCapacity < 0) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return false;
+    }
+    if (capacity < minimumCapacity) {
+        if (capacity > (INT32_MAX - 1) / 2) {        	// integer overflow check
+            status = U_ILLEGAL_ARGUMENT_ERROR;
+            return false;
+        }
+        int32_t newCap = capacity * 2;
+        if (newCap < minimumCapacity) {
+            newCap = minimumCapacity;
+        }
+        if (newCap > (int32_t)(INT32_MAX / sizeof(UElement))) {	// integer overflow check
+            // We keep the original memory contents on bad minimumCapacity.
+            status = U_ILLEGAL_ARGUMENT_ERROR;
+            return false;
+        }
+        UElement* newElems = (UElement *)uprv_realloc(elements, sizeof(UElement)*newCap);
+        if (newElems == nullptr) {
+            // We keep the original contents on the memory failure on realloc or bad minimumCapacity.
+            status = U_MEMORY_ALLOCATION_ERROR;
+            return false;
+        }
+        elements = newElems;
+        capacity = newCap;
+    }
+    return true;
+}
+
+/**
+ * Change the size of this vector as follows: If newSize is smaller,
+ * then truncate the array, possibly deleting held elements for i >=
+ * newSize.  If newSize is larger, grow the array, filling in new
+ * slots with nullptr.
+ */
+void UVector::setSize(int32_t newSize, UErrorCode &status) {
+    if (!ensureCapacity(newSize, status)) {
+        return;
+    }
+    if (newSize > count) {
+        UElement empty;
+        empty.pointer = nullptr;
+        empty.integer = 0;
+        for (int32_t i=count; i<newSize; ++i) {
+            elements[i] = empty;
+        }
+    } else {
+        /* Most efficient to count down */
+        for (int32_t i=count-1; i>=newSize; --i) {
+            removeElementAt(i);
+        }
+    }
+    count = newSize;
+}
+
+/**
+ * Fill in the given array with all elements of this vector.
+ */
+void** UVector::toArray(void** result) const {
+    void** a = result;
+    for (int i=0; i<count; ++i) {
+        *a++ = elements[i].pointer;
+    }
+    return result;
+}
+
+UObjectDeleter *UVector::setDeleter(UObjectDeleter *d) {
+    UObjectDeleter *old = deleter;
+    deleter = d;
+    return old;
+}
+
+UElementsAreEqual *UVector::setComparer(UElementsAreEqual *d) {
+    UElementsAreEqual *old = comparer;
+    comparer = d;
+    return old;
+}
+
+/**
+ * Removes the element at the given index from this vector and
+ * transfer ownership of it to the caller.  After this call, the
+ * caller owns the result and must delete it and the vector entry
+ * at 'index' is removed, shifting all subsequent entries back by
+ * one index and shortening the size of the vector by one.  If the
+ * index is out of range or if there is no item at the given index
+ * then 0 is returned and the vector is unchanged.
+ */
+void* UVector::orphanElementAt(int32_t index) {
+    void* e = nullptr;
+    if (0 <= index && index < count) {
+        e = elements[index].pointer;
+        for (int32_t i=index; i<count-1; ++i) {
+            elements[i] = elements[i+1];
+        }
+        --count;
+    }
+    /* else index out of range */
+    return e;
+}
+
+/**
+ * Insert the given object into this vector at its sorted position
+ * as defined by 'compare'.  The current elements are assumed to
+ * be sorted already.
+ */
+void UVector::sortedInsert(void* obj, UElementComparator *compare, UErrorCode& ec) {
+    UElement e;
+    e.pointer = obj;
+    sortedInsert(e, compare, ec);
+}
+
+/**
+ * Insert the given integer into this vector at its sorted position
+ * as defined by 'compare'.  The current elements are assumed to
+ * be sorted already.
+ */
+void UVector::sortedInsert(int32_t obj, UElementComparator *compare, UErrorCode& ec) {
+    U_ASSERT(deleter == nullptr);
+    UElement e {};
+    e.integer = obj;
+    sortedInsert(e, compare, ec);
+}
+
+// ASSUME elements[] IS CURRENTLY SORTED
+void UVector::sortedInsert(UElement e, UElementComparator *compare, UErrorCode& ec) {
+    // Perform a binary search for the location to insert tok at.  Tok
+    // will be inserted between two elements a and b such that a <=
+    // tok && tok < b, where there is a 'virtual' elements[-1] always
+    // less than tok and a 'virtual' elements[count] always greater
+    // than tok.
+    if (!ensureCapacity(count + 1, ec)) {
+        if (deleter != nullptr) {
+            (*deleter)(e.pointer);
+        }
+        return;
+    }
+    int32_t min = 0, max = count;
+    while (min != max) {
+        int32_t probe = (min + max) / 2;
+        int32_t c = (*compare)(elements[probe], e);
+        if (c > 0) {
+            max = probe;
+        } else {
+            // assert(c <= 0);
+            min = probe + 1;
+        }
+    }
+    for (int32_t i=count; i>min; --i) {
+        elements[i] = elements[i-1];
+    }
+    elements[min] = e;
+    ++count;
+}
+
+/**
+  *  Array sort comparator function.
+  *  Used from UVector::sort()
+  *  Conforms to function signature required for uprv_sortArray().
+  *  This function is essentially just a wrapper, to make a
+  *  UVector style comparator function usable with uprv_sortArray().
+  *
+  *  The context pointer to this function is a pointer back
+  *  (with some extra indirection) to the user supplied comparator.
+  *  
+  */
+static int32_t U_CALLCONV
+sortComparator(const void *context, const void *left, const void *right) {
+    UElementComparator *compare = *static_cast<UElementComparator * const *>(context);
+    UElement e1 = *static_cast<const UElement *>(left);
+    UElement e2 = *static_cast<const UElement *>(right);
+    int32_t result = (*compare)(e1, e2);
+    return result;
+}
+
+
+/**
+  *  Array sort comparison function for use from UVector::sorti()
+  *  Compares int32_t vector elements.
+  */
+static int32_t U_CALLCONV
+sortiComparator(const void * /*context */, const void *left, const void *right) {
+    const UElement *e1 = static_cast<const UElement *>(left);
+    const UElement *e2 = static_cast<const UElement *>(right);
+    int32_t result = e1->integer < e2->integer? -1 :
+                     e1->integer == e2->integer? 0 : 1;
+    return result;
+}
+
+/**
+  * Sort the vector, assuming it contains ints.
+  *     (A more general sort would take a comparison function, but it's
+  *     not clear whether UVector's UElementComparator or
+  *     UComparator from uprv_sortAray would be more appropriate.)
+  */
+void UVector::sorti(UErrorCode &ec) {
+    if (U_SUCCESS(ec)) {
+        uprv_sortArray(elements, count, sizeof(UElement),
+                       sortiComparator, nullptr,  false, &ec);
+    }
+}
+
+
+/**
+ *  Sort with a user supplied comparator.
+ *
+ *    The comparator function handling is confusing because the function type
+ *    for UVector  (as defined for sortedInsert()) is different from the signature
+ *    required by uprv_sortArray().  This is handled by passing the
+ *    the UVector sort function pointer via the context pointer to a
+ *    sortArray() comparator function, which can then call back to
+ *    the original user function.
+ *
+ *    An additional twist is that it's not safe to pass a pointer-to-function
+ *    as  a (void *) data pointer, so instead we pass a (data) pointer to a
+ *    pointer-to-function variable.
+ */
+void UVector::sort(UElementComparator *compare, UErrorCode &ec) {
+    if (U_SUCCESS(ec)) {
+        uprv_sortArray(elements, count, sizeof(UElement),
+                       sortComparator, &compare, false, &ec);
+    }
+}
+
+
+/**
+ *  Stable sort with a user supplied comparator of type UComparator.
+ */
+void UVector::sortWithUComparator(UComparator *compare, const void *context, UErrorCode &ec) {
+    if (U_SUCCESS(ec)) {
+        uprv_sortArray(elements, count, sizeof(UElement),
+                       compare, context, true, &ec);
+    }
+}
+
+U_NAMESPACE_END
+