Hey I have a few questions about handling errors in c++
When do you use exit() or c++ exceptions ?
Are there any scenarios when you want to throw an exception and not catch the exception then exit safely ?
If yes, when do you use exit() over throw ?
Are there other alternatives than the ones I just listed to handle errors ?
#How to handle errors
small plover
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velvet hamlet
In practice I have hardly ever seen the explicit use of exit()
IIRC exit was not for failures, thats std::terminate
And honestly apart from the standard I have seen mixed feelings about exceptions in C++
Usually you’d use them for non logic errors, those that you can’t handle
small plover
what do you do when you have an error and you dont use exceptions ?
Let's say you only want positive integers as input and the user gives you negative values
velvet hamlet
I guess you can repeatedly ask the user for new input until they input something correct
I personally wouldn't use an exception for such a case
coarse vapor
what do you do when you have an error and you dont use exceptions ?
Let's say yo...
return std::variant<ExpectedResultType, ErrorType>
cold zinc
return std::variant<ExpectedResultType, ErrorType>
Std expected id you're using cpp23
coarse vapor
std::variant since C++17
cold zinc
cloud ravine
ez
use exceptions when u want the program to entirely crash
otherwise use std::expected or u can build one urself it's ez and have error handling with less overhead
cloud ravine
return std::variant<ExpectedResultType, ErrorType>
std::pair or just write your own ™️
coarse vapor
std::pair or just write your own ™️
std::pair takes space for both of these return values, you can't decide which one is actually used, but with std::variant there is only one type that is saved in the instance
because it is a type safe union
cloud ravine
oh cool
cold zinc
Write a wrapper arohnd a union instrwd of a std pair
tender arrow
use exceptions when u want the program to entirely crash
wat? crashing the program is the exact opposite of what exceptions are for. I guess you're confusing exceptions with assertions or smth.
tender arrow
Hey I have a few questions about handling errors in c++
When do you use exit() ...
as a general rule of thumb, you never use exit() in C++.
exit() doesn't unwind the stack, destructors won't be called, which is why exit() is basically malpractice in C++
use exceptions for dealing with errors that are not expected to happen during normal program execution or can't be handled locally
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