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This article introduces the knowledge of "C++ 's Rust composition and Integrated knowledge Analysis". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Combination and Integration of Rust Migration for C++ Engineers

# rust

Combination and inheritance

In combination and inheritance

The problems faced by Polymorphism in C++

When using static dispatch, because it is completely dependent on overloading, when writing the corresponding code, it is difficult to ensure that your class fully implements the requirements of the calling code, coupled with the use of depth templates, resulting in error messages that are very difficult to read In order to solve this problem, the C++ Standards Committee added the concept of concepts to the C++ 20 standard, which can explicitly propose constraints. For examples, please see the previous article https://zhuanlan.zhihu.com/p/75755125, and for more information, please see cppreference [2].

When using dynamic dispatch, because of the existence of vptr, it will destroy the memory structure of the object itself, and when your object needs to interact with other libraries (especially libraries written in C), the memory structure will be a significant problem.

Because C++ is a very mature language, and concept is a concept that will only be added in the next standard, the syntax for static and dynamic dispatching is completely different, and for the same constraint, if we need to use both static and dynamic dispatching, we must write twice (once virtual base class, once concepts).

For the three problems mentioned above, there is a unified solution in Rust, that is trait system. For more information, please see the text.

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Minimum implementation of a MimbleWimble protocol in grin

# crate

MimbleWimble is a format and protocol for privacy protection of blockchain. It is a technology that can prevent blockchain from divulging personal information. Its name comes from Harry Potter. Grin is the minimum implementation of the MimbleWimble protocol.

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Amethyst data-oriented and data-driven game engine

# crate

Amethyst is a data-driven and data-oriented game engine designed to be as fast and configurable as possible. The documentation is well documented. Here are two projects implemented by it:

Evoli-3D, ecosystem simulator

Space Menace-2D, action platformer

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Tracing update

# crate

Tracing is a framework for detecting Rust programs to collect structured event-based diagnostic information. Traces are maintained by the Tokio project, but do not require the use of the tokio runtime. The instrument property provides an easy way to add a trace span to a function. A function annotated with instrument creates and enters a span with the function name each time it is called, and uses fmt::Debug to record the function's parameters as fields.

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