0b8e38764c
For simplicity when adding new files. Bug: N/A Test: N/A Change-Id: Ia66e5da5ff680b9287c4431799a935b58de02307
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <iostream>
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namespace android {
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namespace lshal {
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template<typename S>
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class NullableOStream {
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public:
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explicit NullableOStream(S &os) : mOs(&os) {}
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explicit NullableOStream(S *os) : mOs(os) {}
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NullableOStream &operator=(S &os) {
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mOs = &os;
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return *this;
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}
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NullableOStream &operator=(S *os) {
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mOs = os;
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return *this;
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}
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template<typename Other>
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NullableOStream &operator=(const NullableOStream<Other> &other) {
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mOs = other.mOs;
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return *this;
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}
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const NullableOStream &operator<<(std::ostream& (*pf)(std::ostream&)) const {
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if (mOs) {
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(*mOs) << pf;
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}
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return *this;
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}
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template<typename T>
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const NullableOStream &operator<<(const T &rhs) const {
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if (mOs) {
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(*mOs) << rhs;
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}
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return *this;
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}
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S& buf() const {
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return *mOs;
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}
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operator bool() const { // NOLINT(google-explicit-constructor)
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return mOs != nullptr;
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}
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private:
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template<typename>
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friend class NullableOStream;
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S *mOs = nullptr;
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};
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} // namespace lshal
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} // namespace android
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