commit e155dd0fdb9db6b668a1a4a07dfe91f30a343431
author Amit Hilbuch <amithi@webrtc.org> Fri Mar 22 10:16:07 2019 -0700
committer Commit Bot <commit-bot@chromium.org> Fri Mar 22 18:15:22 2019 +0000
tree b78022dafa7f9943dc58abfd2d803ed6b901e167
parent fe0b499634d354e891912ead914426f56087d62d

Adding reinterpret to ArrayView to allow data manipulation.

Reinterpret will only allow conversions when the underlying types are
fundamental and have the same size.

Bug: None
Change-Id: Id6a4e9784998fe65fb26ab3fd398710c892c4a67
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128228
Commit-Queue: Amit Hilbuch <amithi@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27249}

api/array_view_unittest.cc

diff --git a/api/array_view_unittest.cc b/api/array_view_unittest.cc
index 62b51c0..18d0e6c 100644
--- a/api/array_view_unittest.cc
+++ b/api/array_view_unittest.cc
@@ -450,4 +450,23 @@
   EXPECT_THAT(av.subview(1, 3), ElementsAre(2, 3));
 }
 
+TEST(ArrayViewTest, TestReinterpretCastFixedSize) {
+  uint8_t bytes[] = {1, 2, 3};
+  ArrayView<uint8_t, 3> uint8_av(bytes);
+  ArrayView<int8_t, 3> int8_av = reinterpret_array_view<int8_t>(uint8_av);
+  EXPECT_EQ(int8_av.size(), uint8_av.size());
+  EXPECT_EQ(int8_av[0], 1);
+  EXPECT_EQ(int8_av[1], 2);
+  EXPECT_EQ(int8_av[2], 3);
+}
+
+TEST(ArrayViewTest, TestReinterpretCastVariableSize) {
+  std::vector<int8_t> v = {1, 2, 3};
+  ArrayView<int8_t> int8_av(v);
+  ArrayView<uint8_t> uint8_av = reinterpret_array_view<uint8_t>(int8_av);
+  EXPECT_EQ(int8_av.size(), uint8_av.size());
+  EXPECT_EQ(uint8_av[0], 1);
+  EXPECT_EQ(uint8_av[1], 2);
+  EXPECT_EQ(uint8_av[2], 3);
+}
 }  // namespace rtc