Index: webrtc/base/function_view_unittest.cc |
diff --git a/webrtc/base/function_view_unittest.cc b/webrtc/base/function_view_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3ca2df456e0eb26850eb00fce16d0ceb59f6a91b |
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+++ b/webrtc/base/function_view_unittest.cc |
@@ -0,0 +1,146 @@ |
+/* |
+ * Copyright 2016 The WebRTC Project Authors. All rights reserved. |
+ * |
+ * Use of this source code is governed by a BSD-style license |
+ * that can be found in the LICENSE file in the root of the source |
+ * tree. An additional intellectual property rights grant can be found |
+ * in the file PATENTS. All contributing project authors may |
+ * be found in the AUTHORS file in the root of the source tree. |
+ */ |
+ |
+#include <memory> |
+#include <utility> |
+ |
+#include "webrtc/base/function_view.h" |
+#include "webrtc/base/gunit.h" |
+ |
+namespace rtc { |
+ |
+namespace { |
+ |
+int CallWith33(rtc::FunctionView<int(int)> fv) { |
+ return fv(33); |
+} |
+ |
+} // namespace |
+ |
+// Test the main use case of FunctionView: implicitly converting a lambda |
+// function argument. |
+TEST(FunctionViewTest, ImplicitConversion) { |
+ EXPECT_EQ(38, CallWith33([](int x) { return x + 5; })); |
+} |
+ |
+TEST(FunctionViewTest, IntIntLambdaWithoutState) { |
+ auto f = [](int x) { return x + 1; }; |
+ EXPECT_EQ(18, f(17)); |
+ rtc::FunctionView<int(int)> fv(f); |
+ EXPECT_EQ(18, fv(17)); |
+} |
+ |
+TEST(FunctionViewTest, IntVoidLambdaWithState) { |
+ int x = 13; |
+ auto f = [x]() mutable { return ++x; }; |
+ rtc::FunctionView<int()> fv(f); |
+ EXPECT_EQ(14, f()); |
+ EXPECT_EQ(15, fv()); |
+ EXPECT_EQ(16, f()); |
+ EXPECT_EQ(17, fv()); |
+} |
+ |
+// Ensure that FunctionView handles move-only arguments and return values. |
+TEST(FunctionViewTest, UniquePtrPassthrough) { |
+ auto f = [](std::unique_ptr<int> x) { return x; }; |
+ rtc::FunctionView<std::unique_ptr<int>(std::unique_ptr<int>)> fv(f); |
+ std::unique_ptr<int> x(new int); |
+ int* x_addr = x.get(); |
+ auto y = fv(std::move(x)); |
+ EXPECT_EQ(x_addr, y.get()); |
+} |
+ |
+TEST(FunctionViewTest, CopyConstructor) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ rtc::FunctionView<int()> fv2(fv1); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+TEST(FunctionViewTest, MoveConstructorIsCopy) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ rtc::FunctionView<int()> fv2(std::move(fv1)); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+TEST(FunctionViewTest, CopyAssignment) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ auto f23 = [] { return 23; }; |
+ rtc::FunctionView<int()> fv2(f23); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(23, fv2()); |
+ fv2 = fv1; |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+TEST(FunctionViewTest, MoveAssignmentIsCopy) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ auto f23 = [] { return 23; }; |
+ rtc::FunctionView<int()> fv2(f23); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(23, fv2()); |
+ fv2 = std::move(fv1); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+TEST(FunctionViewTest, Swap) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ auto f23 = [] { return 23; }; |
+ rtc::FunctionView<int()> fv2(f23); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(23, fv2()); |
+ using std::swap; |
+ swap(fv1, fv2); |
+ EXPECT_EQ(23, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+// Ensure that when you copy-construct a FunctionView, the new object points to |
+// the same function as the old one, as opposed to the new object pointing to |
+// the old one. |
+TEST(FunctionViewTest, CopyConstructorChaining) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ rtc::FunctionView<int()> fv2(fv1); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+ auto f23 = [] { return 23; }; |
+ fv1 = f23; |
+ EXPECT_EQ(23, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+// Ensure that when you assign one FunctionView to another, we actually make a |
+// copy as opposed to making the second FunctionView point to the first one. |
+TEST(FunctionViewTest, CopyAssignmentChaining) { |
+ auto f17 = [] { return 17; }; |
+ rtc::FunctionView<int()> fv1(f17); |
+ auto f3 = [] { return 3; }; |
+ rtc::FunctionView<int()> fv2(f3); |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(3, fv2()); |
+ fv2 = fv1; |
+ EXPECT_EQ(17, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+ auto f23 = [] { return 23; }; |
+ fv1 = f23; |
+ EXPECT_EQ(23, fv1()); |
+ EXPECT_EQ(17, fv2()); |
+} |
+ |
+} // namespace rtc |