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While `protocol<I>` manages the lifecycle of an erased object via value semantics (deep copies), `protocol_view<I>` allows zero-overhead observation at function boundaries without triggering allocations or transferring ownership.
1. Primary Template (`protocol.h`)
- Added the primary template `template <typename T> class protocol_view;` alongside `protocol<T>`.
2. Code Generation (`scripts/protocol.j2`, `scripts/protocol_manual_vtable.j2`)
- The generator now automatically emits both `protocol<I>` and `protocol_view<I>` specializations.
- Generates two types of views per interface:
- Mutable View (`protocol_view<I>`): Can invoke all methods.
- Const View (`protocol_view<const I>`): Can only invoke `const` methods.
- Implemented `protocol_const_concept_I` to allow types that only implement the `const` portion of an interface to satisfy the const-view requirements.
3. Structural Subtyping & Implicit Conversion
- The view constructors are constrained by C++20 concepts (`protocol_concept_I` and `protocol_const_concept_I`).
- Because `protocol<I>` exposes the identical method signatures as the interface it wraps, `protocol<I>` *itself* structurally satisfies the concept.
4. Const-Correctness Routing & Safety
- Strict enforcement to prevent accidental mutation of `const` objects.
- The compiler will reject (via concept failure) any attempt to construct a mutable `protocol_view<I>` from a `const` object.
5. Documentation
- Updated `README.md` to document `protocol_view` usage.
- Updated the ISO standard library proposal draft (`DRAFT.md`) to formally introduce `protocol_view` as the required mechanism for non-owning structural subtyping, contrasting it with the native raw pointers (`Base*`) used in nominal subtyping.
…otocol into dev-twon-clang-tidy-reviewdog
…otocol into dev-twon-clang-tidy-reviewdog
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