Re: Number of chars
Re: Number of chars
- Subject: Re: Number of chars
- From: Luther Baker <email@hidden>
- Date: Thu, 21 Mar 2013 11:59:24 -0500
I apologize for leading you the wrong way Luca!
-Luther
On Thu, Mar 21, 2013 at 9:46 AM, Luca Ciciriello <
email@hidden> wrote:
> Ok, thanks.
>
> Luca.
>
> On Mar 21, 2013, at 3:43 PM, Glenn L. Austin <email@hidden>
> wrote:
>
> >
> > On Mar 21, 2013, at 2:34 AM, Jean-Daniel Dupas <email@hidden>
> wrote:
> >
> >>
> >> Le 21 mars 2013 à 09:27, Luca Ciciriello <email@hidden>
> a écrit :
> >>
> >>> Hi all.
> >>> I'm using in my iOS project some Objective-C++ modules. Here I have
> some conversion from NSString to C++11 std::string. After this conversion I
> found (correctly) in my std::string some 2-byte characters.
> >>> My question is: How can I count the number of chars and not the
> numbers of byte in my std::string?
> >>>
> >>
> >> Don't use std::string to store unicode string. They are not design to
> support such content.
> >>
> >> You can use std::wstring instead.
> >
> >
> > Actually, std::string works *just fine* for UTF-8 strings.
> >
> > It's just that, in Unicode, 1 character doesn't necessarily fit in 1
> byte. Also, you can't easily do truncation of strings (you might be
> truncating the string in the middle of a multi-byte sequence -- which is
> true in pretty much every encoding except UCS-4).
> >
> > UTF-8 is relatively easy to work with, however. You look at the
> previous byte in the string to see if your current character is part of a
> multi-byte sequence or not -- and keep going back until you find one that
> doesn't have the high-bit set, and that's the last character of the
> previous sequence. Of course, that "go back" doesn't mean anything if
> you're already at the first byte in your string...
> >
> > --
> > Glenn L. Austin, Computer Wizard and Race Car Driver <><
> > <http://www.austin-soft.com>
> >
> >
>
>
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