[STLExtras] Add size() for ranges, and remove distance()

r332057 introduced distance() for ranges. Based on post-commit feedback,
this renames distance() to size(). The new size() is also only enabled
when the operation is O(1).

Differential Revision: https://reviews.llvm.org/D46976

llvm-svn: 332551

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/unittests/ADT/IteratorTest.cpp b/llvm/unittests/ADT/IteratorTest.cpp
index 69033bbf593..341049a6847 100644
--- a/llvm/unittests/ADT/IteratorTest.cpp
+++ b/llvm/unittests/ADT/IteratorTest.cpp
@@ -369,8 +369,8 @@ TEST(RangeTest, Distance) {
   std::vector<int> v1;
   std::vector<int> v2{1, 2, 3};
 
-  EXPECT_EQ(std::distance(v1.begin(), v1.end()), distance(v1));
-  EXPECT_EQ(std::distance(v2.begin(), v2.end()), distance(v2));
+  EXPECT_EQ(std::distance(v1.begin(), v1.end()), size(v1));
+  EXPECT_EQ(std::distance(v2.begin(), v2.end()), size(v2));
 }
 
 } // anonymous namespace