AuROXTL/Include/auROXTL/auTryCallUtils.hpp

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