Support: remove local definition of ArrayRef

include/glow/Support/ADT.h

@@ -10,6 +10,8 @@
 #include <string>
 #include <vector>
 
+#include "llvm/ADT/ArrayRef.h"
+
 namespace glow {
 /// \brief A range adaptor for a pair of iterators.
 ///
@@ -44,81 +46,7 @@ iterator_range<decltype(begin(std::declval<T>()))> drop_begin(T &&t, int n) {
   return make_range(std::next(begin(t), n), end(t));
 }
 
-/// ArrayRef - represent a constant reference to an array.
-/// Derived from LLVM's ArrayRef.
-template <typename T> class ArrayRef {
-public:
-  using iterator = const T *;
-  using const_iterator = const T *;
-  using size_type = size_t;
-  using reverse_iterator = std::reverse_iterator<iterator>;
-
-private:
-  const T *data_ = nullptr;
-  size_type length_ = 0;
-
-public:
-  /// Construct an empty ArrayRef.
-  ArrayRef() = default;
-
-  /// Construct an ArrayRef from a single element.
-  ArrayRef(const T &one) : data_(&one), length_(1) {}
-
-  /// Construct an ArrayRef from a pointer and length.
-  ArrayRef(const T *data, size_t length) : data_(data), length_(length) {}
-
-  /// Construct an ArrayRef from a range.
-  ArrayRef(const T *begin, const T *end) : data_(begin), length_(end - begin) {}
-
-  /// Construct an ArrayRef from a std::initializer_list.
-  ArrayRef(const std::initializer_list<T> &vec)
-      : data_(vec.begin() == vec.end() ? (T *)nullptr : vec.begin()),
-        length_(vec.size()) {}
-
-  /// Construct an ArrayRef from a std::vector.
-  template <typename A>
-  ArrayRef(const std::vector<T, A> &vec)
-      : data_(vec.data()), length_(vec.size()) {}
-
-  iterator begin() const { return data_; }
-  iterator end() const { return data_ + length_; }
-
-  reverse_iterator rbegin() const { return reverse_iterator(end()); }
-  reverse_iterator rend() const { return reverse_iterator(begin()); }
-
-  bool empty() const { return length_ == 0; }
-
-  const T *data() const { return data_; }
-
-  size_t size() const { return length_; }
-
-  /// Drop the first element of the array.
-  ArrayRef<T> drop_front() const {
-    assert(size() >= 1 && "Array is empty");
-    return ArrayRef(data() + 1, size() - 1);
-  }
-
-  /// Drop the last element of the array.
-  ArrayRef<T> drop_back(size_t N = 1) const {
-    assert(size() >= 1 && "Array is empty");
-    return ArrayRef(data(), size() - 1);
-  }
-
-  const T &operator[](size_t Index) const {
-    assert(Index < length_ && "Invalid index!");
-    return data_[Index];
-  }
-
-  /// equals - Check for element-wise equality.
-  bool equals(ArrayRef RHS) const {
-    if (length_ != RHS.length_) {
-      return false;
-    }
-    return std::equal(begin(), end(), RHS.begin());
-  }
-
-  std::vector<T> vec() const { return std::vector<T>(begin(), end()); }
-};
+using llvm::ArrayRef;
 
 /// MutableArrayRef - Represent a mutable reference to an array (0 or more
 /// elements consecutively in memory), i.e. a start pointer and a length.  It
@@ -200,14 +128,6 @@ template <typename T> class MutableArrayRef : public ArrayRef<T> {
   }
 };
 
-template <typename T> inline bool operator==(ArrayRef<T> LHS, ArrayRef<T> RHS) {
-  return LHS.equals(RHS);
-}
-
-template <typename T> inline bool operator!=(ArrayRef<T> LHS, ArrayRef<T> RHS) {
-  return !(LHS == RHS);
-}
-
 template <typename T>
 inline bool operator==(MutableArrayRef<T> LHS, MutableArrayRef<T> RHS) {
   return LHS.equals(RHS);