protected_struct.h

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#pragma once
 
#include <freertos/FreeRTOS.h>
#include "lib/logger/logger.h"

template <typename struct_type>
class protected_struct {
private:
    static constexpr const char* TAG = "protected_struct";
 
    struct_type data;
    mutable SemaphoreHandle_t mutex;
 
    struct proxy {
        const protected_struct& parent;
 
        explicit proxy(const protected_struct& parent) : parent(parent) {
            if (parent.mutex == nullptr) {
                parent.mutex = xSemaphoreCreateMutex();
            }
            if (parent.mutex != nullptr) {
                xSemaphoreTake(parent.mutex, portMAX_DELAY);
            }
        }
        ~proxy() { xSemaphoreGive(parent.mutex); }

        struct_type* operator->() const {
            return const_cast<struct_type*>(&parent.data);
        }

        operator struct_type&() const {
            return *const_cast<struct_type*>(&parent.data);
        }
    };
 
public:
    explicit protected_struct() : mutex() {}
    ~protected_struct() {
        if (mutex != nullptr) {
            vSemaphoreDelete(mutex);
        }
    }
 
    protected_struct(const protected_struct&) = delete;
    protected_struct& operator=(const protected_struct&) = delete;

    proxy operator->() const {
        return proxy(*this);
    }

    proxy operator*() const {
        return proxy(*this);
    }
};