76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
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/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: auTryCallUtils.hpp
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Date: 2022-11-16
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Author: Reece
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***/
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#pragma once
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#define _AU_TRYCALL_CHECKCODE(X) AU_TEMPLATE_ENABLE_WHEN(AuIsBaseOf_v<AuCallErrorTag, CtorCode_t> && !AuIsSame_v<X, CtorCode_t>)
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template <class CtorCode_t = AuErrorCode_t, class Callable_t, typename ... Args, _AU_TRYCALL_CHECKCODE(Callable_t)>
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inline auto AuTryCall(Callable_t callable, CtorCode_t &status, Args&& ... args)
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{
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if constexpr (AuIsCallable_v<Callable_t, Args&& ..., CtorCode_t &>)
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{
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status = CtorCode_t::Failed();
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return callable(AuForward<Args&&>(args)..., AuReference(status));
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}
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else
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{
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static_assert(AuIsCallable_v<Callable_t, Args&& ...>, "bad try-call prototype");
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try
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{
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status = CtorCode_t::Success();
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return callable(AuForward<Args &&>(args)...);
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}
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catch (...)
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{
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status = CtorCode_t::Failed();
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return AuResultOf_t<Callable_t, Args...>();
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}
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}
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}
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template <class CtorCode_t = AuErrorCode_t, class Callable_t, typename ... Args, class T, _AU_TRYCALL_CHECKCODE(T)>
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inline CtorCode_t AuTryCall(Callable_t callable, T &ref, Args&& ... args)
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{
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CtorCode_t status;
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if constexpr (AuIsCallable_v<Callable_t, Args ..., CtorCode_t &>)
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{
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ref = callable(AuForward<Args>(args)..., AuReference(status));
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return status;
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}
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else
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{
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try
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{
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ref = callable(AuForward<Args>(args)...);
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return CtorCode_t::Success();
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}
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catch (...)
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{
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ref = AuMove(T());
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if constexpr (AuIsSame_v<CtorCode_t, AuErrorCode_t>)
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{
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return CtorCode_t::Catch();
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}
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else
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{
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return CtorCode_t::Failed();
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}
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}
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}
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}
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template <class CtorCode_t = AuErrorCode_t, class Callable_t, typename ... Args, _AU_TRYCALL_CHECKCODE(Callable_t)>
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inline auto AuTryCallPair(Callable_t callable, Args&& ... args)
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{
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CtorCode_t code;
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auto a = AuTryCall<CtorCode_t, Callable_t, Args...>(callable, AuReference(code), AuForward<Args &&>(args)...);
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return AuMakePair(AuMove(code), a);
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}
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#undef _AU_TRYCALL_CHECKCODE
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