Microsoft has rolled out Proxy 4, the latest version of its C++ library designed to make runtime polymorphism easier and more flexible. This update brings a bunch of new tools that help developers build cleaner, more efficient code without relying heavily on inheritance or virtual functions.

What’s New in Proxy 4

The main idea behind Proxy 4 is to give programmers handy building blocks for creating different kinds of references and proxies. It now offers aliases like proxy_view and weak_proxy, which are built on top of the core proxy concept. These make it simple to borrow objects temporarily or create weak references that don’t keep objects alive. For example, proxy_view lets you look at an object without owning it, while weak_proxy creates a reference that can be locked only when needed. This makes managing object lifetime and ownership much clearer and safer.

Better Proxy Creation and Facade Support

Creating shared or weak proxies just got faster and lighter. The new make_proxy_shared and allocate_proxy_shared APIs let you generate these proxies without the extra overhead of std::shared_ptr. They use small, efficient internal pointer types to keep memory use low and performance high. Additionally, Proxy 4 introduces facade_aware_overload_t, which helps define recursive operator patterns that refer back to the facade itself. This is a big help for chaining operators like addition or string concatenation that return new proxy objects of the same type, making your code neater and more flexible.

Tools for Easier Development

Along with the new features, Microsoft also launched the Compiler Explorer, an online tool that lets developers write and test Proxy code directly in their web browsers. This makes experimenting with Proxy 4 much more accessible, especially for those who want to try out its features without setting up complicated environments. It’s a handy resource for learning and debugging Proxy-based code quickly.

Overall, Proxy 4 aims to simplify complex C++ patterns for runtime polymorphism, making it easier to write safe, efficient, and expressive code. By offering new aliases, proxies, and tools, Microsoft is helping C++ developers build better software with less hassle.

Inspired by

• https://www.infoworld.com/article/4046345/microsoft-unveils-proxy-4-library-for-polymorphic-coding-in-c-plus-plus.html

Sources

• gmpg.org
• microsoft.com
• github.com
• godbolt.org
• podigee.com