How Can We Improve the Reusability of the Key-Oriented Access-Protection Pattern in C ?

Reusability of Key-Oriented Access-Protection Pattern

The key-oriented access-protection pattern provides a concise and expressive way to control access to methods and functions based on key objects. However, the pattern can currently be limited in terms of reusability.

Improvements in C 03

One method to improve reusability in C 03 involves using macros to define passkey groups:

However, this method still requires the caller to know the specific passkey it needs to create and can be cumbersome for creating passkeys for functions.

Improvements in C 0x

C 0x introduces significant improvements to the passkey pattern, enabling complete template generation. Through variadic templates and friendship for template parameters, the following code showcases the improved implementation:

This enhanced implementation eliminates both drawbacks of the earlier C 03 solution. The caller no longer needs to guess which passkey to use, and the boilerplate code handles the passkey creation and function friending generically, requiring minimal additional definition.

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