Callback struct

Type-erased single-binding delegate — stores one member function or free function.

Template parameters
Ret	Return type.
Args	Argument types.

Internally holds a context pointer (bindObj) and a stateless thunk (stub) that performs the cast and dispatch. No heap allocation; trivially copyable.

Public types

using Fn = Ret(*)(void*, Args...): Thunk signature: context pointer followed by call args.

Constructors, destructors, conversion operators

__attribute__((always_inline)) const: Invoke the bound function. Undefined behaviour if IsBound() is false.

Public functions

template<typename T, Ret(T::*)(Args...) MemFn> void Bind(T* obj): Bind a member function. Stores the object pointer and synthesizes a thunk.
void BindStatic(Fn fn, void* ctx = nullptr): Bind a free function or capturing-context thunk.
void Reset(): Clear the binding; IsBound() returns false afterward.
auto IsBound() const -> bool: Returns true if a function is currently bound.

Public variables

void* bindObj: Context pointer passed as first argument to the thunk.
Fn stub: Stateless dispatch thunk; null when unbound.

Function documentation

template<typename Ret, typename... Args> template<typename T, Ret(T::)(Args...) MemFn>
void Callback<Ret, Args>::Bind(T obj)

Bind a member function. Stores the object pointer and synthesizes a thunk.

Template parameters
T	Object type that owns `MemFn`.
MemFn	Pointer-to-member to dispatch to.

template<typename Ret, typename... Args>
void Callback<Ret, Args>::BindStatic(Fn fn, void* ctx = nullptr)

Bind a free function or capturing-context thunk.