Reland "Move webrtc/{base => rtc_base}" (https://codereview.webrtc.org/2877023002)
Reland the base->rtc_base without adding stub headers (will be
done in follow-up CL). This preserves git blame history of all files.
BUG=webrtc:7634
NOTRY=True
TBR=kwiberg@webrtc.org
Change-Id: Iea3bb6f3f67b8374c96337b63e8f5aa3e6181012
Reviewed-on: https://chromium-review.googlesource.com/554611
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18821}diff --git a/webrtc/rtc_base/callback.h b/webrtc/rtc_base/callback.h
new file mode 100644
index 0000000..4435a18
--- /dev/null
+++ b/webrtc/rtc_base/callback.h
@@ -0,0 +1,260 @@
+// This file was GENERATED by command:
+// pump.py callback.h.pump
+// DO NOT EDIT BY HAND!!!
+
+/*
+ * Copyright 2012 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.
+ */
+
+// To generate callback.h from callback.h.pump, execute:
+// /home/build/google3/third_party/gtest/scripts/pump.py callback.h.pump
+
+// Callbacks are callable object containers. They can hold a function pointer
+// or a function object and behave like a value type. Internally, data is
+// reference-counted, making copies and pass-by-value inexpensive.
+//
+// Callbacks are typed using template arguments. The format is:
+// CallbackN<ReturnType, ParamType1, ..., ParamTypeN>
+// where N is the number of arguments supplied to the callable object.
+// Callbacks are invoked using operator(), just like a function or a function
+// object. Default-constructed callbacks are "empty," and executing an empty
+// callback does nothing. A callback can be made empty by assigning it from
+// a default-constructed callback.
+//
+// Callbacks are similar in purpose to std::function (which isn't available on
+// all platforms we support) and a lightweight alternative to sigslots. Since
+// they effectively hide the type of the object they call, they're useful in
+// breaking dependencies between objects that need to interact with one another.
+// Notably, they can hold the results of Bind(), std::bind*, etc, without
+// needing
+// to know the resulting object type of those calls.
+//
+// Sigslots, on the other hand, provide a fuller feature set, such as multiple
+// subscriptions to a signal, optional thread-safety, and lifetime tracking of
+// slots. When these features are needed, choose sigslots.
+//
+// Example:
+// int sqr(int x) { return x * x; }
+// struct AddK {
+// int k;
+// int operator()(int x) const { return x + k; }
+// } add_k = {5};
+//
+// Callback1<int, int> my_callback;
+// cout << my_callback.empty() << endl; // true
+//
+// my_callback = Callback1<int, int>(&sqr);
+// cout << my_callback.empty() << endl; // false
+// cout << my_callback(3) << endl; // 9
+//
+// my_callback = Callback1<int, int>(add_k);
+// cout << my_callback(10) << endl; // 15
+//
+// my_callback = Callback1<int, int>();
+// cout << my_callback.empty() << endl; // true
+
+#ifndef WEBRTC_RTC_BASE_CALLBACK_H_
+#define WEBRTC_RTC_BASE_CALLBACK_H_
+
+#include "webrtc/base/refcount.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+
+namespace rtc {
+
+template <class R>
+class Callback0 {
+ public:
+ // Default copy operations are appropriate for this class.
+ Callback0() {}
+ template <class T> Callback0(const T& functor)
+ : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+ R operator()() {
+ if (empty())
+ return R();
+ return helper_->Run();
+ }
+ bool empty() const { return !helper_; }
+
+ private:
+ struct Helper : RefCountInterface {
+ virtual ~Helper() {}
+ virtual R Run() = 0;
+ };
+ template <class T> struct HelperImpl : Helper {
+ explicit HelperImpl(const T& functor) : functor_(functor) {}
+ virtual R Run() {
+ return functor_();
+ }
+ T functor_;
+ };
+ scoped_refptr<Helper> helper_;
+};
+
+template <class R,
+ class P1>
+class Callback1 {
+ public:
+ // Default copy operations are appropriate for this class.
+ Callback1() {}
+ template <class T> Callback1(const T& functor)
+ : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+ R operator()(P1 p1) {
+ if (empty())
+ return R();
+ return helper_->Run(p1);
+ }
+ bool empty() const { return !helper_; }
+
+ private:
+ struct Helper : RefCountInterface {
+ virtual ~Helper() {}
+ virtual R Run(P1 p1) = 0;
+ };
+ template <class T> struct HelperImpl : Helper {
+ explicit HelperImpl(const T& functor) : functor_(functor) {}
+ virtual R Run(P1 p1) {
+ return functor_(p1);
+ }
+ T functor_;
+ };
+ scoped_refptr<Helper> helper_;
+};
+
+template <class R,
+ class P1,
+ class P2>
+class Callback2 {
+ public:
+ // Default copy operations are appropriate for this class.
+ Callback2() {}
+ template <class T> Callback2(const T& functor)
+ : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+ R operator()(P1 p1, P2 p2) {
+ if (empty())
+ return R();
+ return helper_->Run(p1, p2);
+ }
+ bool empty() const { return !helper_; }
+
+ private:
+ struct Helper : RefCountInterface {
+ virtual ~Helper() {}
+ virtual R Run(P1 p1, P2 p2) = 0;
+ };
+ template <class T> struct HelperImpl : Helper {
+ explicit HelperImpl(const T& functor) : functor_(functor) {}
+ virtual R Run(P1 p1, P2 p2) {
+ return functor_(p1, p2);
+ }
+ T functor_;
+ };
+ scoped_refptr<Helper> helper_;
+};
+
+template <class R,
+ class P1,
+ class P2,
+ class P3>
+class Callback3 {
+ public:
+ // Default copy operations are appropriate for this class.
+ Callback3() {}
+ template <class T> Callback3(const T& functor)
+ : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+ R operator()(P1 p1, P2 p2, P3 p3) {
+ if (empty())
+ return R();
+ return helper_->Run(p1, p2, p3);
+ }
+ bool empty() const { return !helper_; }
+
+ private:
+ struct Helper : RefCountInterface {
+ virtual ~Helper() {}
+ virtual R Run(P1 p1, P2 p2, P3 p3) = 0;
+ };
+ template <class T> struct HelperImpl : Helper {
+ explicit HelperImpl(const T& functor) : functor_(functor) {}
+ virtual R Run(P1 p1, P2 p2, P3 p3) {
+ return functor_(p1, p2, p3);
+ }
+ T functor_;
+ };
+ scoped_refptr<Helper> helper_;
+};
+
+template <class R,
+ class P1,
+ class P2,
+ class P3,
+ class P4>
+class Callback4 {
+ public:
+ // Default copy operations are appropriate for this class.
+ Callback4() {}
+ template <class T> Callback4(const T& functor)
+ : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+ R operator()(P1 p1, P2 p2, P3 p3, P4 p4) {
+ if (empty())
+ return R();
+ return helper_->Run(p1, p2, p3, p4);
+ }
+ bool empty() const { return !helper_; }
+
+ private:
+ struct Helper : RefCountInterface {
+ virtual ~Helper() {}
+ virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4) = 0;
+ };
+ template <class T> struct HelperImpl : Helper {
+ explicit HelperImpl(const T& functor) : functor_(functor) {}
+ virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4) {
+ return functor_(p1, p2, p3, p4);
+ }
+ T functor_;
+ };
+ scoped_refptr<Helper> helper_;
+};
+
+template <class R,
+ class P1,
+ class P2,
+ class P3,
+ class P4,
+ class P5>
+class Callback5 {
+ public:
+ // Default copy operations are appropriate for this class.
+ Callback5() {}
+ template <class T> Callback5(const T& functor)
+ : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+ R operator()(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) {
+ if (empty())
+ return R();
+ return helper_->Run(p1, p2, p3, p4, p5);
+ }
+ bool empty() const { return !helper_; }
+
+ private:
+ struct Helper : RefCountInterface {
+ virtual ~Helper() {}
+ virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) = 0;
+ };
+ template <class T> struct HelperImpl : Helper {
+ explicit HelperImpl(const T& functor) : functor_(functor) {}
+ virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) {
+ return functor_(p1, p2, p3, p4, p5);
+ }
+ T functor_;
+ };
+ scoped_refptr<Helper> helper_;
+};
+} // namespace rtc
+
+#endif // WEBRTC_RTC_BASE_CALLBACK_H_