**RAII (Resource Acquisition Is Initialization)** — resource management via object lifetime. ```cpp class File { private: std::ifstream file; public: File(const std::string& path) { file.open(path); // Acquire } ~File() { if (file.is_open()) { file.close(); // Release } } }; ``` **Principle:** - Acquire resource in constructor. - Release resource in destructor. - Automatic cleanup.

C++: What is RAII?

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What is RAII?

RAII (Resource Acquisition Is Initialization) — resource management via object lifetime.

cpp

1class File {
2private:
3    std::ifstream file;
4
5public:
6    File(const std::string& path) {
7        file.open(path);  // Acquire
8    }
9
10    ~File() {
11        if (file.is_open()) {
12            file.close();  // Release
13        }
14    }
15};

Principle:

Acquire resource in constructor.
Release resource in destructor.
Automatic cleanup.

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