C++ プログラミング スキルを効率的に活用して、安定した信頼性の高い組み込みシステム機能を構築します。

class File {
public:
    File(const std::string& filename) : fileHandle(open(filename.c_str(), O_RDONLY)) {
        if (fileHandle == -1) {
            throw std::runtime_error("Failed to open file");
        }
    }
    
    ~File() {
        if (fileHandle != -1) {
            close(fileHandle);
        }
    }
    
    void read(char* buffer, size_t size) {
        if (fileHandle == -1) {
            throw std::runtime_error("File is not open");
        }
        
        ssize_t bytesRead = ::read(fileHandle, buffer, size);
        if (bytesRead == -1) {
            throw std::runtime_error("Failed to read file");
        }
    }
    
private:
    int fileHandle;
};

void readFromFile(const std::string& filename) {
    File file(filename);
    char buffer[1024];
    file.read(buffer, sizeof(buffer));
    // 处理读取的数据
}

void processData(const std::vector<int>& data) {
    std::shared_ptr<int> ptr = std::make_shared<int>(42);
    // 处理数据
}

int main() {
    std::vector<int> data{1, 2, 3, 4, 5};
    processData(data);
    // ...
}

int divide(int a, int b) {
    if (b == 0) {
        throw std::invalid_argument("Can't divide by zero");
    }
    return a / b;
}

int main() {
    try {
        int result = divide(10, 0);
        std::cout << "Result: " << result << std::endl;
    } catch (const std::exception& e) {
        std::cerr << "Error: " << e.what() << std::endl;
    }
    // ...
}