Resource Acquisition is Initialization (RAII)

Introduced in CS247. I don’t fully understand what this does.

RAII is a programming concept used in C++ to manage resources like memory, file handles, etc. It links resource management to object lifetime:

  • Acquisition: Resources are acquired in a constructor
  • Release: Resources are released in a destructor
  • Automatic Management: When an object goes out of scope, its destructor is automatically called, releasing the resources

RAII is a C++ programming technique which binds the life cycle of a resource that must be acquired before use to the lifetime of an object.



	ifstream file{"file.txt"};
  • Resource (file handler) is acquired in the constructor (initialization)
  • Resource is freed (closing the file) in the destructor