Timeline for Reading a number from the standard input
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Oct 9, 2021 at 17:10 | vote | accept | jdt | ||
| Oct 9, 2021 at 16:43 | comment | added | G. Sliepen |
It could be useful in some situations, but this quickly gets ugly. Consider that if you call std::string s{"Hello"}; printName(s);, that even though you pass the std::optional via reference, it is actually going to construct a temporary std::optional that holds a copy of the string s.
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| Oct 9, 2021 at 16:26 | comment | added | jdt |
Do you think it could be a good idea to use std::optional for function arguments with something like this: void printName(const std::optional<std::string>& name = std::nullopt)?
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| Oct 9, 2021 at 9:48 | comment | added | Toby Speight |
I don't think that std::from_chars() is suitable - see my comment on JDługosz's answer.
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| Oct 9, 2021 at 7:12 | comment | added | G. Sliepen |
@JDługosz How? You need to check the return value from std::from_chars(), same as for std::stoi().
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| Oct 8, 2021 at 22:48 | comment | added | JDługosz |
Using the newer from_chars prevents the need to check whether it took the whole input.
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| Oct 8, 2021 at 7:50 | comment | added | Toby Speight | Two schools of thought on the correct stream for the failure message. The other view is that if we're prompting, then we should use the same stream as the prompt. | |
| Oct 8, 2021 at 6:27 | history | edited | G. Sliepen | CC BY-SA 4.0 |
deleted 4 characters in body
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| Oct 7, 2021 at 20:41 | history | answered | G. Sliepen | CC BY-SA 4.0 |