# open-cpp-utils: optional.h Source File

Loading...
Searching...
No Matches
optional.h
// =====================================================================================================================
// Copyright 2024 Medusa Slockbower
// 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.
// =====================================================================================================================
#ifndef OPTIONAL_H
#define OPTIONAL_H
namespace open_cpp_utils
{
template<typename T>
class optional
{
public:
using value_type = T;
optional() : data_(), valid_(false) { }
optional(const value_type& data) : data_(data), valid_(true) { }
optional(value_type&& data) : data_(data), valid_(true) { }
optional(const optional& other) = default;
optional(optional&& other) = default;
optional& operator=(const optional& other) = default;
optional& operator=(optional&& other) = default;
optional& operator=(const value_type& data) { data_ = data; valid_ = true; return *this; }
optional& operator=(value_type&& data) { data_ = data; valid_ = true; return *this; }
value_type& operator+=(const value_type& data) { assert(valid_); data_ += data; return data_; }
value_type& operator-=(const value_type& data) { assert(valid_); data_ += data; return data_; }
value_type& operator*=(const value_type& data) { assert(valid_); data_ += data; return data_; }
value_type& operator/=(const value_type& data) { assert(valid_); data_ += data; return data_; }
value_type& operator%=(const value_type& data) { assert(valid_); data_ += data; return data_; }
value_type& operator<<=(const value_type& data) { assert(valid_); data_ <<= data; return data_; }
value_type& operator>>=(const value_type& data) { assert(valid_); data_ >>= data; return data_; }
value_type& operator|=(const value_type& data) { assert(valid_); data_ |= data; return data_; }
value_type& operator&=(const value_type& data) { assert(valid_); data_ &= data; return data_; }
value_type& operator^=(const value_type& data) { assert(valid_); data_ ^= data; return data_; }
[[nodiscard]] bool operator()() const { return valid_; }
operator value_type&() { assert(valid_); return data_; }
operator const value_type&() const { assert(valid_); return data_; }
value_type* operator->() { assert(valid_); return &data_; }
const value_type* operator->() const { assert(valid_); return &data_; }
value_type& operator*() { assert(valid_); return data_; }
const value_type& operator*() const { assert(valid_); return data_; }
void reset() { valid_ = false; }
private:
value_type data_;
bool valid_;
};
}
#endif //OPTIONAL_H
open_cpp_utils::optional
Definition optional.h:23