Removing llvm::distance and llvm::copy for iterator_range based on post-commit review feedback. Adding an explicit range-based constructor to SmallVector, which supersedes the llvm::copy functionality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203460 91177308-0d34-0410-b5e6-96231b3b80d8

Author: AaronBallman

include/llvm/ADT/SmallVector.h

@@ -14,6 +14,7 @@
 #ifndef LLVM_ADT_SMALLVECTOR_H
 #define LLVM_ADT_SMALLVECTOR_H
 
+#include "llvm/ADT/iterator_range.h"
 #include "llvm/Support/AlignOf.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/MathExtras.h"
@@ -870,6 +871,12 @@ class SmallVector : public SmallVectorImpl<T> {
     this->append(S, E);
   }
 
+  template <typename RangeTy>
+  explicit SmallVector(const llvm::iterator_range<RangeTy> R)
+      : SmallVectorImpl<T>(N) {
+    this->append(R.begin(), R.end());
+  }
+
   SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(N) {
     if (!RHS.empty())
       SmallVectorImpl<T>::operator=(RHS);

include/llvm/ADT/iterator_range.h

@@ -19,17 +19,10 @@
 #ifndef LLVM_ADT_ITERATOR_RANGE_H
 #define LLVM_ADT_ITERATOR_RANGE_H
 
-#include <algorithm>
-#include <iterator>
 #include <utility>
 
 namespace llvm {
 
-template <typename Range>
-struct range_traits {
-  typedef typename Range::difference_type difference_type;
-};
-
 /// \brief A range adaptor for a pair of iterators.
 ///
 /// This just wraps two iterators into a range-compatible interface. Nothing
@@ -39,10 +32,6 @@ class iterator_range {
   IteratorT begin_iterator, end_iterator;
 
 public:
-  // FIXME: We should be using iterator_traits to determine the
-  // difference_type, but most of our iterators do not expose anything like it.
-  typedef int difference_type;
-
   iterator_range() {}
   iterator_range(IteratorT begin_iterator, IteratorT end_iterator)
       : begin_iterator(std::move(begin_iterator)),
@@ -51,20 +40,6 @@ class iterator_range {
   IteratorT begin() const { return begin_iterator; }
   IteratorT end() const { return end_iterator; }
 };
-
-/// \brief Determine the distance between the end() and begin() iterators of
-/// a range. Analogous to std::distance().
-template <class Range>
-typename range_traits<Range>::difference_type distance(Range R) {
-  return std::distance(R.begin(), R.end());
-}
-
-/// \brief Copies members of a range into the output iterator provided.
-/// Analogous to std::copy.
-template <class Range, class OutputIterator>
-OutputIterator copy(Range In, OutputIterator Result) {
-  return std::copy(In.begin(), In.end(), Result);
-}
 }
 
 #endif