Proxy 3.3.0 Release

New Features 🌟

• Added facilities for shared/weak ownership by @mingxwa in #264:
  • function template make_proxy_shared: Similar to instantiating a proxy with std::shared_ptr, but
    • Without additional type-erasure on the deleter,
    • Having a more compact memory layout without requiring a separate control block,
    • Without weak ownership support if not desired.
  • function template allocate_proxy_shared: Similar to make_proxy_shared() while supports any custom allocators.
  • alias template weak_proxy and class template weak_facade: Specify proxy with weak ownership.
  • basic_facade_builder::support_weak: Specifies that a facade type F supports conversion from proxy<F> to weak_proxy<F>.
• function template make_proxy_view by @mingxwa in #265: Similar to creating a proxy_view from a raw pointer, but honors constness and reference semantics.
• concept proxiable_target by @mingxwa in #265: Specifies that a reference type can instantiate a proxy_view.

Quality Improvements 🔬

• Improved diagnostics by reducing constraints by @mingxwa in #262. Thanks to @SidneyCogdill for the great idea!
• Allowed creating proxy from a null pointer by @mingxwa in #260
• Prefered static operator() if available by @mingxwa in #267
• Constrained proxy with facade by @mingxwa in #263
• Switched lifetime convention to standard dispatch model by @mingxwa in #269
• Aligned behavior of direct and indirect proxy_invoke with rvalue reference by @mingxwa in #271

Toolchain Updates 🛠️

• Added benchmarks for shared ownership both in indirect invocation and lifetime management by @mingxwa in #264. Below are the numbers from a recent CI build:

	MSVC on Windows	GCC on Ubuntu	Clang on Ubuntu	Apple Clang on macOS	NVIDIA HPC on Ubuntu
Indirect invocation on small objects via proxy vs. virtual functions (shared ownership)	🟢proxy is about 327.6% faster	🟢proxy is about 83.2% faster	🟢proxy is about 46.1% faster	🟢proxy is about 26.8% faster	🟢proxy is about 75.5% faster
Indirect invocation on large objects via proxy vs. virtual functions (shared ownership)	🟢proxy is about 165.3% faster	🟢proxy is about 28.4% faster	🟢proxy is about 20.8% faster	🔴proxy is about 5.1% slower	🟢proxy is about 8.6% faster
Basic lifetime management for small objects with proxy (shared ownership) vs. std::shared_ptr (both without memory pool)	🟢proxy is about 11.8% faster	🟢proxy is about 10.8% faster	🟢proxy is about 8.5% faster	🟢proxy is about 37.5% faster	🟢proxy is about 8.8% faster
Basic lifetime management for small objects with proxy (shared ownership) vs. std::shared_ptr (both with memory pool)	🟢proxy is about 5.7% faster	🟡proxy is about 4.0% faster	🟢proxy is about 21.5% faster	🟢proxy is about 30.5% faster	🟡proxy is about 1.6% faster
Basic lifetime management for large objects with proxy (shared ownership) vs. std::shared_ptr (both without memory pool)	🟢proxy is about 21.1% faster	🟢proxy is about 6.0% faster	🟡proxy is about 0.4% slower	🟢proxy is about 48.9% faster	🟢proxy is about 8.7% faster
Basic lifetime management for large objects with proxy (shared ownership) vs. std::shared_ptr (both with memory pool)	🟢proxy is about 17.7% faster	🟢proxy is about 11.2% faster	🟢proxy is about 29.1% faster	🟢proxy is about 10.5% faster	🟡proxy is about 4.5% faster

• Attached environment information to benchmarking report by @mingxwa in #270
• Revised documentation for 3.3.0 by @mingxwa in #272

Full Changelog: 3.2.1...3.3.0