/*
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* Copyright (C) 2018 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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#ifndef ANDROID_APEXD_STRING_LOG_H_
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#define ANDROID_APEXD_STRING_LOG_H_
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// Simple helper class to create strings similar to LOGs.
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// Usage sample:
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// std::string msg = StringLog() << "Hello " << std::hex << 1234;
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#include <cstring>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <errno.h>
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template <typename T>
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class BaseStringLog {
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public:
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BaseStringLog() {}
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// Pipe in values.
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template <class U>
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T& operator<<(const U& t) {
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os_stream << t;
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return static_cast<T&>(*this);
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}
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// Pipe in modifiers.
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T& operator<<(std::ostream& (*f)(std::ostream&)) {
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os_stream << f;
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return static_cast<T&>(*this);
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}
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// Get the current string.
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// NOLINTNEXTLINE(google-explicit-constructor)
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operator std::string() const { return os_stream.str(); }
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private:
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std::ostringstream os_stream;
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};
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class StringLog : public BaseStringLog<StringLog> {};
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class PStringLog : public BaseStringLog<PStringLog> {
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public:
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PStringLog() : errno_(errno) {}
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// Get the current string.
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// NOLINTNEXTLINE(google-explicit-constructor)
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operator std::string() const {
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return (BaseStringLog::operator std::string())
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.append(": ")
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.append(strerror(errno_));
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}
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private:
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int errno_;
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};
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#endif // ANDROID_APEXD_STRING_LOG_H_
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