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Name	Modified	Size	InfoDownloads / Week
Parent folder
proxy-4.0.0.tgz	2025-08-18	19.1 kB	0
Proxy 4.0.0 -- Skills, semantics, and better codegen source code.tar.gz	2025-08-18	105.9 kB	0
Proxy 4.0.0 -- Skills, semantics, and better codegen source code.zip	2025-08-18	177.1 kB	0
README.md	2025-08-18	9.7 kB	0
Totals: 4 Items		311.9 kB	0

Proxy 4 focuses on a composable skills API, refined core semantics for the basic building blocks, and leaner code generation. It remains header-only and keeps 3.x coexistence paths introduced in 3.4.0.

New: a refreshed documentation site at https://microsoft.github.io/proxy/ and out-of-the-box availability on Compiler Explorer. Proxy now also supports the Intel oneAPI C++ compilers in CI.

What's inside

Skills and builder
basic_facade_builder gains add_skill and moves feature toggles into pro::skills (format, wformat, rtti, as_view, as_weak, slim). [#285]
{fmt} integration via proxy_fmt.h with pro::skills::fmt_format and fmt_wformat (requires {fmt} >= 6.1; include <proxy/proxy.h> and {fmt} before proxy_fmt.h). [#287]
Core semantics and ergonomics
proxy::facade_type alias and stricter polymorphic ctor/assignment constraints (pointer-like only). [#278]
proxy_invoke now passes the proxy reference to indirect function pointers, enabling leaner call sequences around indirect calls; removed deprecated PRO_DEF_WEAK_DISPATCH (since 3.2.0).
Improved design contracts: removed access_proxy and proxiable_ptr_constraints; refined ProAccessible, ProBasicFacade, ProFacade, ProDispatch, and ProOverload requirements; accessing a null proxy is erroneous behavior; updated spec and tests. [#320, [#336]]
proxy_indirect_accessor is no longer copyable/movable to prevent misuse; added tests. [#335]
Introduced is_bitwise_trivially_relocatable and updated dispatch/pointer internals to support bitwise trivially relocatable but non-movable types. We did not adopt the C++26 "trivially relocatable" model; Proxy follows the "bitwise trivially relocatable" direction to preserve memcpy-based relocation semantics (see P3780R0). [#330]
Fixed prefix ++/-- to return proxy& (like assignment operators). [#332]
weak_proxy supports upward conversion. [#286]
C++20 modules
Introduced C++20 module interface files (.ixx) and separated convenience macros to support modules. A huge thanks to @SidneyCogdill for leading this effort. See the modules support docs for usage caveats and current CMake module export limitations. [#293]
Code generation
Leaner indirect call paths via proxy_invoke adjustments reduce surrounding instructions. [#280]
Builds where <format> is unavailable are supported; features that need formatting are conditional. [#289]
Toolchain and CI
Clang upgraded to 20 in CI; fixed build with GCC trunk; added Intel oneAPI pipeline; updated NVHPC; improved libc++ compatibility. [#282, [#327], [#333]]
Docs and site
New docs site (MkDocs) with dark theme and improved navigation. See the FAQ for major upgrade guidance. Extracted example code from docs; updated sample links. [#299, [#331], [#311], [#291], [#328]]
clang-format applied and enforced in CI; code and macro cleanup for standard naming. [#309, [#314], [#283], [#316], [#317]]

Upgrading

Most users can update includes and CMake targets and rebuild. If you customized dispatches/skills or relied on old behaviors, see notes below.

Headers and namespaces
Preferred include: <proxy/proxy.h>. Versioned headers remain under <proxy/v4/>. Code lives in pro::v4 inline namespace.
CMake package/targets
New package/namespace: msft_proxy4. Example:
- find_package(msft_proxy4 REQUIRED)
- target_link_libraries(your_target PRIVATE msft_proxy4::proxy)
- For the module interface, see docs; .ixx sources are shipped but export workflows vary by toolchain.
Builder and skills
basic_facade_builder::support(...) -> add_skill<...>(). Feature toggles are in pro::skills (e.g., pro::skills::rtti, ::as_view, ::as_weak, ::fmt_format).
New header proxy_fmt.h for {fmt} skills; include <proxy/proxy.h> and {fmt} first.
Removed and changed behaviors
PRO_DEF_WEAK_DISPATCH removed (deprecated since 3.2.0). Use standard dispatch patterns; weak fallbacks can call back into proxy.
Accessing a null proxy is erroneous behavior. Audit code paths that may dereference disengaged proxies.
proxy_indirect_accessor isn't copyable/movable; avoid storing *p; consume it immediately.
Relocatability: prefer pointer-like indirections if a type fails proxiable checks; see relocatability docs and is_bitwise_trivially_relocatable guidance.
Formatting availability
If <format> is not available on your toolchain, Proxy will still build; only format-dependent skills/features are disabled. Use {fmt} skills if desired.