81 lines
3.5 KiB
C++
81 lines
3.5 KiB
C++
// =====================================================================================================================
|
|
// 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 OPEN_CPP_UTILS_OPTIONAL_H
|
|
#define OPEN_CPP_UTILS_OPTIONAL_H
|
|
|
|
#include <assert.h>
|
|
|
|
namespace open_cpp_utils
|
|
{
|
|
template<typename T>
|
|
class optional
|
|
{
|
|
public:
|
|
using value_type = T;
|
|
|
|
optional() : 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; }
|
|
|
|
bool operator==(const optional& b) const
|
|
{
|
|
if(not(valid_ || b.valid_)) return valid_ == b.valid_;
|
|
return data_ == b.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_; }
|
|
value_type& operator^=(const value_type& data) { assert(valid_); data_ ^= data; return data_; }
|
|
|
|
[[nodiscard]] bool operator()() const { return valid_; }
|
|
|
|
operator value_type() const { assert(valid_); return data_; }
|
|
|
|
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 // OPEN_CPP_UTILS_OPTIONAL_H
|