RAII(Resource Acquisition Is Initialization) is a C++ programming idiom that ties resource management to object lifetime.

When Objects Should Not Be Stack-Allocated

Objects should be heap-allocated when:

• Object size is very large
• Object size cannot be determined at compile time
• Object is a function return value but should not be returned by value due to specific reasons

Resource Management

RAII uses stack-based objects and destructors to effectively manage system resources (including heap memory). For objects created with new inside stack scope, they should be wrapped in a class to ensure automatic destruction and resource release when the function returns.

Note: For any new-allocated objects on the stack, they should be wrapped in a class to ensure automatic cleanup through the destructor when going out of scope.