microsoft/proxy

Health v2 · maintenance only

Flags: archived

Adoption not part of the score

3040 stars · 223 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Proxy is a header-only C++20 library from Microsoft that provides next-generation polymorphism without inheritance, using pointer-based facades and compile-time facade builders. It is portable, non-intrusive, and freestanding, suitable even for embedded or kernel-level code.

Use cases

• replace inheritance-based polymorphism in C++ with a faster alternative
• write polymorphic code in C++ as easily as in Java or C#
• type-erase arbitrary types without intrusive base classes
• use polymorphism in freestanding or embedded environments
• manage lifetimes of polymorphic objects safely
• build traits-like abstractions similar to Rust in C++

When to choose

• you need polymorphism without inheritance or intrusive modifications to types
• you target C++20 and want a portable, header-only solution
• performance matters and you want to avoid virtual-call overhead and heap allocation where possible
• you work in freestanding environments like kernels or embedded systems

When to avoid

• your codebase must compile with pre-C++20 compilers
• you prefer classic OOP inheritance hierarchies and virtual functions
• you need a maintained upstream - this Microsoft repo is archived; use ngcpp/proxy instead

Facets

library · maturity maintenance

programming-language developer-tools programming-languages developer-tools cross-platform cpp cross-platform windows cpp20 header-only polymorphism duck-typing single-header type-erasure no-inheritance linux macos

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