50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
#pragma once
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#include <functional>
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#include <utility>
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#include <vector>
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namespace esphome {
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namespace ratgdo {
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template <typename T>
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class observable {
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public:
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observable(const T& value)
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: value_(value)
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{
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}
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template <typename U>
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observable& operator=(U value)
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{
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if (value != this->value_) {
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this->value_ = value;
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this->notify();
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}
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return *this;
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}
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T const* operator&() const { return &this->value_; }
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T const& operator*() const { return this->value_; }
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template <typename Observer>
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void subscribe(Observer&& observer)
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{
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this->observers_.push_back(std::forward<Observer>(observer));
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}
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void notify() const
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{
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for (const auto& observer : this->observers_) {
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observer(this->value_);
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}
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}
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private:
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T value_;
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std::vector<std::function<void(T)>> observers_;
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};
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} // namespace ratgdo
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} // namespace esphome
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