68 lines
2.7 KiB
C++
68 lines
2.7 KiB
C++
// =====================================================================================================================
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// Copyright 2024 Medusa Slockbower
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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 OPTIONAL_H
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#define OPTIONAL_H
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template<typename T>
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class Optional
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{
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public:
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using Type = T;
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Optional() : Data(), Valid(false) { }
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Optional(const Type& data) : Data(data), Valid(true) { }
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Optional(Type&& data) : Data(data), Valid(true) { }
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Optional(const Optional& other) = default;
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Optional(Optional&& other) = default;
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Optional& operator=(const Optional& other) = default;
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Optional& operator=(Optional&& other) = default;
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Type& operator=(const Type& data) { Data = data; Valid = true; return Data; }
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Type& operator=(Type&& data) { Data = data; Valid = true; return Data; }
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Type& operator+=(const Type& data) { assert(Valid); Data += data; return Data; }
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Type& operator-=(const Type& data) { assert(Valid); Data += data; return Data; }
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Type& operator*=(const Type& data) { assert(Valid); Data += data; return Data; }
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Type& operator/=(const Type& data) { assert(Valid); Data += data; return Data; }
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Type& operator%=(const Type& data) { assert(Valid); Data += data; return Data; }
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Type& operator<<=(const Type& data) { assert(Valid); Data <<= data; return Data; }
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Type& operator>>=(const Type& data) { assert(Valid); Data >>= data; return Data; }
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Type& operator|=(const Type& data) { assert(Valid); Data |= data; return Data; }
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Type& operator&=(const Type& data) { assert(Valid); Data &= data; return Data; }
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Type& operator^=(const Type& data) { assert(Valid); Data ^= data; return Data; }
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[[nodiscard]] bool operator()() const { return Valid; }
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operator Type&() { assert(Valid); return Data; }
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operator const Type&() const { assert(Valid); return Data; }
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Type* operator->() { assert(Valid); return &Data; }
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const Type* operator->() const { assert(Valid); return &Data; }
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Type& operator*() { assert(Valid); return Data; }
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const Type& operator*() const { assert(Valid); return Data; }
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void Reset() { Valid = false; }
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private:
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Type Data;
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bool Valid;
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};
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#endif //OPTIONAL_H
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