Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/callback_unittest.cc

@@ -0,0 +1,81 @@
+/*
+ *  Copyright 2004 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 "webrtc/base/bind.h"
+#include "webrtc/base/callback.h"
+#include "webrtc/base/gunit.h"
+
+namespace rtc {
+
+namespace {
+
+void f() {}
+int g() { return 42; }
+int h(int x) { return x * x; }
+void i(int& x) { x *= x; }  // NOLINT: Testing refs
+
+struct BindTester {
+  int a() { return 24; }
+  int b(int x) const { return x * x; }
+};
+
+}  // namespace
+
+TEST(CallbackTest, VoidReturn) {
+  Callback0<void> cb;
+  EXPECT_TRUE(cb.empty());
+  cb();  // Executing an empty callback should not crash.
+  cb = Callback0<void>(&f);
+  EXPECT_FALSE(cb.empty());
+  cb();
+}
+
+TEST(CallbackTest, IntReturn) {
+  Callback0<int> cb;
+  EXPECT_TRUE(cb.empty());
+  cb = Callback0<int>(&g);
+  EXPECT_FALSE(cb.empty());
+  EXPECT_EQ(42, cb());
+  EXPECT_EQ(42, cb());
+}
+
+TEST(CallbackTest, OneParam) {
+  Callback1<int, int> cb1(&h);
+  EXPECT_FALSE(cb1.empty());
+  EXPECT_EQ(9, cb1(-3));
+  EXPECT_EQ(100, cb1(10));
+
+  // Try clearing a callback.
+  cb1 = Callback1<int, int>();
+  EXPECT_TRUE(cb1.empty());
+
+  // Try a callback with a ref parameter.
+  Callback1<void, int&> cb2(&i);
+  int x = 3;
+  cb2(x);
+  EXPECT_EQ(9, x);
+  cb2(x);
+  EXPECT_EQ(81, x);
+}
+
+TEST(CallbackTest, WithBind) {
+  BindTester t;
+  Callback0<int> cb1 = Bind(&BindTester::a, &t);
+  EXPECT_EQ(24, cb1());
+  EXPECT_EQ(24, cb1());
+  cb1 = Bind(&BindTester::b, &t, 10);
+  EXPECT_EQ(100, cb1());
+  EXPECT_EQ(100, cb1());
+  cb1 = Bind(&BindTester::b, &t, 5);
+  EXPECT_EQ(25, cb1());
+  EXPECT_EQ(25, cb1());
+}
+
+}  // namespace rtc