/usr/include/opencc/Optional.hpp is in libopencc-dev 1.0.4-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Open Chinese Convert
*
* Copyright 2010-2014 BYVoid <byvoid@byvoid.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace opencc {
/**
* A class that wraps type T into a nullable type.
* @ingroup opencc_cpp_api
*/
template <typename T> class Optional {
public:
/**
* The constructor of Optional.
*/
Optional(T actual) : isNull(false), data(actual) {}
/**
* Returns true if the instance is null.
*/
bool IsNull() const { return isNull; }
/**
* Returns the containing data of the instance.
*/
const T& Get() const { return data; }
/**
* Constructs a null instance.
*/
static Optional<T> Null() { return Optional(); }
private:
Optional() : isNull(true) {}
bool isNull;
T data;
};
/**
* Specialization of Optional for pointers.
*
* Reduce a bool.
*/
template <typename T> class Optional<T*> {
private:
Optional() : data(nullptr) {}
typedef T* TPtr;
TPtr data;
public:
Optional(TPtr actual) : data(actual) {}
bool IsNull() const { return data == nullptr; }
const TPtr& Get() const { return data; }
static Optional<TPtr> Null() { return Optional(); }
};
}
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