mirror of https://github.com/esphome/esphome.git
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
#pragma once
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#include <cstring>
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#include <cstdint>
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#include <type_traits>
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namespace esphome {
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class ESPPreferenceBackend {
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public:
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virtual bool save(const uint8_t *data, size_t len) = 0;
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virtual bool load(uint8_t *data, size_t len) = 0;
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};
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class ESPPreferenceObject {
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public:
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ESPPreferenceObject() = default;
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ESPPreferenceObject(ESPPreferenceBackend *backend) : backend_(backend) {}
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template<typename T> bool save(const T *src) {
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if (backend_ == nullptr)
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return false;
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return backend_->save(reinterpret_cast<const uint8_t *>(src), sizeof(T));
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}
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template<typename T> bool load(T *dest) {
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if (backend_ == nullptr)
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return false;
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return backend_->load(reinterpret_cast<uint8_t *>(dest), sizeof(T));
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}
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protected:
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ESPPreferenceBackend *backend_;
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};
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class ESPPreferences {
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public:
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virtual ESPPreferenceObject make_preference(size_t length, uint32_t type, bool in_flash) = 0;
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virtual ESPPreferenceObject make_preference(size_t length, uint32_t type) = 0;
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/**
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* Commit pending writes to flash.
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*
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* @return true if write is successful.
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*/
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virtual bool sync() = 0;
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#ifndef USE_ESP8266
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template<typename T, typename std::enable_if<std::is_trivially_copyable<T>::value, bool>::type = true>
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#else
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// esp8266 toolchain doesn't have is_trivially_copyable
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template<typename T>
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#endif
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ESPPreferenceObject make_preference(uint32_t type, bool in_flash) {
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return this->make_preference(sizeof(T), type, in_flash);
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}
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#ifndef USE_ESP8266
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template<typename T, typename std::enable_if<std::is_trivially_copyable<T>::value, bool>::type = true>
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#else
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template<typename T>
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#endif
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ESPPreferenceObject make_preference(uint32_t type) {
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return this->make_preference(sizeof(T), type);
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}
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};
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extern ESPPreferences *global_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
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} // namespace esphome
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