| #pragma once
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|
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| #include <functional>
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| #include <memory>
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| #include <type_traits>
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|
|
| namespace fastsignals
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| {
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| namespace detail
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| {
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| template <class ReturnType, class ClassType, bool AddConst, class... Args>
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| struct weak_binder
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| {
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| using ConstMethodType = ReturnType (ClassType::*)(Args... args) const;
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| using NonConstMethodType = ReturnType (ClassType::*)(Args... args);
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| using MethodType = std::conditional_t<AddConst, ConstMethodType, NonConstMethodType>;
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| using WeakPtrType = std::weak_ptr<ClassType>;
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|
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| weak_binder(MethodType pMethod, WeakPtrType&& pObject)
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| : m_pMethod(pMethod)
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| , m_pObject(std::move(pObject))
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| {
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| }
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|
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| ReturnType operator()(Args... args) const
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| {
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| if (auto pThis = m_pObject.lock())
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| {
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| return (pThis.get()->*m_pMethod)(std::forward<Args>(args)...);
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| }
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| return ReturnType();
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| }
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|
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| MethodType m_pMethod;
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| WeakPtrType m_pObject;
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| };
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| }
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|
|
|
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| template <typename ReturnType, typename ClassType, typename... Params, typename... Args>
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| decltype(auto) bind_weak(ReturnType (ClassType::*memberFn)(Params... args), std::shared_ptr<ClassType> const& pThis, Args... args)
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| {
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| using weak_binder_alias = detail::weak_binder<ReturnType, ClassType, false, Params...>;
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|
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| weak_binder_alias invoker(memberFn, std::weak_ptr<ClassType>(pThis));
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| return std::bind(invoker, args...);
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| }
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|
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|
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| template <typename ReturnType, typename ClassType, typename... Params, typename... Args>
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| decltype(auto) bind_weak(ReturnType (ClassType::*memberFn)(Params... args) const, std::shared_ptr<ClassType> const& pThis, Args... args)
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| {
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| using weak_binder_alias = detail::weak_binder<ReturnType, ClassType, true, Params...>;
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|
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| weak_binder_alias invoker(memberFn, std::weak_ptr<ClassType>(pThis));
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| return std::bind(invoker, args...);
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| }
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|
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|
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| template <typename ReturnType, typename ClassType, typename... Params, typename... Args>
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| decltype(auto) bind_weak(ReturnType (ClassType::*memberFn)(Params... args), std::weak_ptr<ClassType> pThis, Args... args)
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| {
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| using weak_binder_alias = detail::weak_binder<ReturnType, ClassType, false, Params...>;
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|
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| weak_binder_alias invoker(memberFn, std::move(pThis));
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| return std::bind(invoker, args...);
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| }
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|
|
|
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| template <typename ReturnType, typename ClassType, typename... Params, typename... Args>
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| decltype(auto) bind_weak(ReturnType (ClassType::*memberFn)(Params... args) const, std::weak_ptr<ClassType> pThis, Args... args)
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| {
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| using weak_binder_alias = detail::weak_binder<ReturnType, ClassType, true, Params...>;
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|
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| weak_binder_alias invoker(memberFn, std::move(pThis));
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| return std::bind(invoker, args...);
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| }
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|
|
| }
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|
