1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_VERIFIER_SCOPED_NEWLINE_H_ 18 #define ART_RUNTIME_VERIFIER_SCOPED_NEWLINE_H_ 19 20 #include <ostream> 21 22 #include <android-base/logging.h> 23 24 namespace art { 25 namespace verifier { 26 27 // RAII to inject a newline after a message. 28 struct ScopedNewLine { ScopedNewLineScopedNewLine29 explicit ScopedNewLine(std::ostream& os) : stream(os) {} 30 ScopedNewLineScopedNewLine31 ScopedNewLine(ScopedNewLine&& other) : stream(other.stream), active(other.active) { 32 other.active = false; 33 } 34 35 ScopedNewLine(ScopedNewLine&) = delete; 36 ScopedNewLine& operator=(ScopedNewLine&) = delete; 37 ~ScopedNewLineScopedNewLine38 ~ScopedNewLine() { 39 if (active) { 40 stream << std::endl; 41 } 42 } 43 44 template <class T> 45 ScopedNewLine& operator<<(const T& t) { 46 DCHECK(active); 47 stream << t; 48 return *this; 49 } 50 51 ScopedNewLine& operator<<(std::ostream& (*f)(std::ostream&)) { 52 DCHECK(active); 53 stream << f; 54 return *this; 55 } 56 57 std::ostream& stream; 58 bool active = true; 59 }; 60 61 } // namespace verifier 62 } // namespace art 63 64 #endif // ART_RUNTIME_VERIFIER_SCOPED_NEWLINE_H_ 65