U++ forum: Welcome to the forum

Search on this site

Search in forums

Home » U++ Library support » U++ Core » StrInt returning value

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

StrInt returning value [message #59848]

Wed, 03 May 2023 08:06

forlano
Messages: 1215
Registered: March 2006
Location: Italy

Senior Contributor

Hello,

it seems that StrInt() return an integer but it can return even a Null in case the conversion cannot be done.
I would like that StrInt() can return 0 as default instead of Null.
Do we have an alternative version of StrInt() that return 0 as default?

StrInt is based on ScanInt

int ScanInt(const char *ptr)
{
	int x;
	bool overflow = false;
	return ScanInt<char, byte, uint32, int, 10>(x, ptr, overflow) && !overflow ? x : Null;
}

The syntax is too complicated for me. I wonder if the following version can return 0 as wanted

int ScanInt0(const char *ptr)
{
	int x;
	bool overflow = false;
	return ScanInt<char, byte, uint32, int, 10>(x, ptr, overflow) && !overflow ? x : 0; //<----
}

Thanks,
Luigi

[Updated on: Wed, 03 May 2023 08:13]

Report message to a moderator

Re: StrInt returning value [message #59849 is a reply to message #59848]

Wed, 03 May 2023 14:02

Klugier
Messages: 1106
Registered: September 2012
Location: Poland, Kraków

Senior Contributor

Hello Lugi,

Changes like you proposed all out of scope. The current behavior is with us for a very long period of time and users are used to it. The function behaves in accordance to our documentation. Also changing this behavior to what you have proposed means breaking API change, which should be avoided at all cost. You will literally break dozens of application that relays on this function.

The alternative version doesn't exist, because c++ doesn't allow to have the same functions but with different return type. Anyway, introducing new function we will pollute our API. Keep it simple stupid with one implementation is reasonable in this case.

So, at the moment you just need to align to the current behavior and handle Null as error case.

Klugier

U++ - one framework to rule them all.

Report message to a moderator

Re: StrInt returning value [message #59850 is a reply to message #59848]

Wed, 03 May 2023 15:21

mirek
Messages: 14271
Registered: November 2005

Ultimate Member

forlano wrote on Wed, 03 May 2023 08:06

Hello,

it seems that StrInt() return an integer but it can return even a Null in case the conversion cannot be done.
I would like that StrInt() can return 0 as default instead of Null.
Do we have an alternative version of StrInt() that return 0 as default?

Well, we already had Atof, so I guess it is logical to have Atoi and Atoi64.

https://github.com/ultimatepp/ultimatepp/commit/0cea273540d8 f19c65bc6994cb5f40ccafbf1bab

Mirek

Report message to a moderator