Mitzi - Advanced Compile-Time Validation for C++

Mitzi is a header-only library designed to provide advanced compile-time validation capabilities in C++. Leveraging the power of stateful metaprogramming, Mitzi aims to enhance code safety and performance by offering features such as borrow checking, lifetime management, and destructor arguments. It uses C++23 and is currently in its early stages of development.

Compiler Explorer - https://godbolt.org/z/hfz77hc4K

Blog post of the initial implementation (outdated) - https://a10nw01f.github.io/post/advanced_compile_time_validation/

How to use

Create Custom Validation Rules

Each rule contains two parts:
Mixin - the interface of the rule, it encapsulates the meta state and records actions.
Validate - function that detects an error based on the recorded actions.

struct my_rule {
	struct custom_error {};
	struct custom_action {};

	template<class state>
	struct mixin {
		template<
			auto eval = []{},
			auto v - state::recorder::template add<custom_action>()>()
		>
		void foo() { }
	};

	static constexpr std::optional<mitzi::validation_error<custom_error>> validate(auto actions) {
		/*...*/
	}
};

Profiles

Create a profile that validates a set of rules:

using safe_profile = profile<control_flow_parser_rule, ptr_rule, borrow_rule>;

Validate a lambda with a profile:

mitzi::run(safe_profile{}, []<class M>(M, auto get_actions) {
	constexpr auto actions = get_actions();
	// actions == std::array{ init, borrow_action(ref, 0), borrow_action(mut, 0) };
	
	auto num = M::borrow(42);
	auto& ref1 = num.ref();
	auto& mut1 = num.mut();
})

M is the combined interface of all the validation rules in the profile.
get_actions returns all the actions that the lambda records.

Usage

#include <mitzi/mitzi.h>

Contribution

Mitzi is an ongoing project, and contributions are welcome! Whether it's through reporting bugs, suggesting new features, or submitting pull requests, your involvement helps make Mitzi better for everyone.

License

Mitzi is licensed under the MIT License. You are free to use, modify, and distribute this software according to the terms of the license.

Disclaimer

Mitzi is still in the early stages of development. While it aims to provide robust compile-time validation features, it may contain bugs or limitations. Please use it with caution and feel free to report any issues you encounter.

Dedication

This library is dedicated to my dearly beloved cat Mitzi who recently passed away. I only wish to spend more time with you in this lifetime of the next.

a10nw01f / Mitzi