Add addStaticIndexMetaMethod and addStaticNewIndexMetaMethod to Class

[Copilot]

Extends the __index/__newindex metamethod fallback system to the static class table (MyClass.key), which previously had no interception mechanism. Instance-level addIndexMetaMethod/addNewIndexMetaMethod were unaffected.

New API

• addStaticIndexMetaMethod(fn) — intercepts unknown key reads on the static class table; callback signature (const LuaRef& key, lua_State*) -> LuaRef (no self)
• addStaticNewIndexMetaMethod(fn) — intercepts unknown key writes; callback signature (const LuaRef& key, const LuaRef& value, lua_State*) -> LuaRef

Both accept a raw function pointer or any callable (lambda with captures, functor).

std::unordered_map<std::string, int> store;

luabridge::getGlobalNamespace(L)
    .beginClass<MyClass>("MyClass")
        .addStaticIndexMetaMethod([&store](const luabridge::LuaRef& key, lua_State* L) -> luabridge::LuaRef {
            auto it = store.find(key.tostring());
            return it != store.end() ? luabridge::LuaRef(L, it->second) : luabridge::LuaRef(L);
        })
        .addStaticNewIndexMetaMethod([&store](const luabridge::LuaRef& key, const luabridge::LuaRef& value, lua_State*) -> luabridge::LuaRef {
            if (value.isNumber()) store[key.tostring()] = value.unsafe_cast<int>();
            return value;
        })
    .endClass();
// Lua: MyClass.x = 42  →  print(MyClass.x)  --> 42

Implementation

• ClassInfo.h — getStaticIndexFallbackKey() / getStaticNewIndexFallbackKey() registry keys, separate from instance fallback keys
• CFunctions.h — try_call_static_index_fallback() / try_call_static_newindex_fallback(); wired into index_metamethod<false> and newindex_metamethod<false>
• Namespace.h — addStaticIndexMetaMethod / addStaticNewIndexMetaMethod on Class<T>, each with functor and function-pointer overloads
• Distribution/LuaBridge.h — amalgamated header updated

Fallback priority

The fallback is consulted first. If it returns nil, normal lookup continues and registered static properties/functions are found as usual. A non-nil return overrides any same-named registered property.

Tests & docs

• 10 tests in ClassExtensibleTests covering both callable forms, nil fall-through to real properties/functions, priority shadowing, standalone newindex, and combined usage
• Manual.md §2.7.3 added with usage examples and priority semantics

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[kunitoki]

these changes are unrelated to the requested change

[Copilot]

these changes are unrelated to the requested change

The accidentally committed Build/ directory artifacts have been removed in commit 6126934. The PR now only contains the relevant source changes.

[kunitoki]

@copilot Improvements to do:

• make sure test coverage is high on newly added features
• update Manual.md with usage and examples

[kunitoki]

Looks great !