wehub-resource-sync
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
/* ******************************************************************************
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*
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*
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* This program and the accompanying materials are made available under the
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* terms of the Apache License, Version 2.0 which is available at
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* https://www.apache.org/licenses/LICENSE-2.0.
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*
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* See the NOTICE file distributed with this work for additional
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* information regarding copyright ownership.
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* Unless required by applicable law or agreed to in writing,
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* software 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. See
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* the License for the specific language governing permissions and limitations
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* under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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******************************************************************************/
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#ifndef SD_OPTIONAL_H_
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#define SD_OPTIONAL_H_
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#include "../system/common.h"
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#include "../system/op_boilerplate.h"
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namespace sd {
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template<typename T>
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class Optional {
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private:
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T value;
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bool hasValue;
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public:
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Optional() : hasValue(false) {}
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explicit Optional(T val) : value(val), hasValue(true) {}
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bool isPresent() const { return hasValue; }
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operator bool() const { return hasValue && value; }
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T get() const {
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if (!hasValue) THROW_EXCEPTION("Accessing empty Optional");
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return value;
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}
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T getOrThrow(const char* msg) const {
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if (!hasValue) THROW_EXCEPTION(msg);
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return value;
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}
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operator T() const { return get(); } // Implicit conversion to T
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};
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// Specialization for pointer types
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template<typename T>
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class Optional<T*> {
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private:
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T* value;
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bool hasValue;
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public:
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Optional() : value(nullptr), hasValue(false) {}
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explicit Optional(T* val) : value(val), hasValue(val != nullptr) {}
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bool isPresent() const { return hasValue && value != nullptr; }
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operator bool() const { return isPresent(); }
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T* get() const {
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if (!isPresent()) THROW_EXCEPTION("Accessing empty Optional");
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return value;
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}
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T* getOrThrow(const char* msg) const {
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if (!isPresent()) THROW_EXCEPTION(msg);
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return value;
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}
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operator T*() const { return get(); } // Implicit conversion to T*
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T* operator->() const { return get(); }
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T& operator*() const { return *get(); }
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};
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} // namespace sd
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#endif // SD_OPTIONAL_H_
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