1 /* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_CALLBACKS_H_ 32 #define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_CALLBACKS_H_ 33 34 namespace blink { 35 36 // A WebCallbacks<S, T> represents a callback object. Typically it is created 37 // in Blink and passed to Chromium, and onSuccess or onError will be called 38 // from Chromium. 39 // When transferring ownership, use |std::unique_ptr<X>| as a type 40 // parameter. Otherwise, |const X&| or |X| for a type parameter. It is 41 // generally not preferred to use |X*| because the object ownership is not well 42 // specified. 43 44 template <typename S, typename T> 45 class WebCallbacks { 46 public: 47 virtual ~WebCallbacks() = default; OnSuccess(S)48 virtual void OnSuccess(S) {} OnError(T)49 virtual void OnError(T) {} 50 }; 51 52 template <typename S> 53 class WebCallbacks<S, void> { 54 public: 55 virtual ~WebCallbacks() = default; OnSuccess(S)56 virtual void OnSuccess(S) {} OnError()57 virtual void OnError() {} 58 }; 59 60 } // namespace blink 61 62 #endif 63