forked from mindspore-Ecosystem/mindspore
120 lines
2.7 KiB
C++
120 lines
2.7 KiB
C++
/**
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* Copyright 2019 Huawei Technologies Co., Ltd
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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 PREDICT_COMMON_OPTION_H_
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#define PREDICT_COMMON_OPTION_H_
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#include <type_traits>
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#include <utility>
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#include "common/mslog.h"
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namespace mindspore {
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namespace predict {
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template <typename T>
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struct InnerSome {
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explicit InnerSome(const T &t) : _t(std::move(t)) {}
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T _t;
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};
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template <typename T>
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InnerSome<typename std::decay<T>::type> Some(T &&t) {
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return InnerSome<typename std::decay<T>::type>(std::forward<T>(t));
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}
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struct None {};
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template <typename T>
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class Option {
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public:
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Option() : state(NONE) {}
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explicit Option(const T &t) : data(t), state(SOME) {}
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explicit Option(T &&t) : data(std::move(t)), state(SOME) {}
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explicit Option(const InnerSome<T> &some) : data(some._t), state(SOME) {}
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explicit Option(const None &none) : state(NONE) {}
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Option(const Option<T> &that) : state(that.state) {
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if (that.IsSome()) {
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new (&data) T(that.data);
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}
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}
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virtual ~Option() = default;
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bool IsNone() const { return state == NONE; }
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bool IsSome() const { return state == SOME; }
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const T &Get() const & {
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MS_ASSERT(IsSome());
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return data;
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}
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T &Get() & {
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MS_ASSERT(IsSome());
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return data;
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}
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T &&Get() && {
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MS_ASSERT(IsSome());
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return std::move(data);
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}
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const T &&Get() const && {
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MS_ASSERT(IsSome());
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return std::move(data);
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}
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// oprerator override
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Option<T> &operator=(const Option<T> &that) {
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if (&that != this) {
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if (IsSome()) {
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data.~T();
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}
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state = that.state;
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if (that.IsSome()) {
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new (&data) T(that.data);
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}
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}
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return *this;
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}
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bool operator==(const Option<T> &that) const {
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return (IsNone() && that.IsNone()) || (IsSome() && that.IsSome() && data == that.data);
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}
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bool operator!=(const Option<T> &that) const { return !(*this == that); }
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bool operator==(const T &that) const { return IsSome() && data == that; }
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bool operator!=(const T &that) const { return !(*this == that); }
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private:
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enum State { NONE = 0, SOME = 1 };
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T data;
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State state;
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};
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} // namespace predict
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} // namespace mindspore
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#endif // PREDICT_COMMON_OPTION_H_
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