[program-l] Re: c++ byte vector to string conversion
- From: Soronel Haetir <soronel.haetir@xxxxxxxxx>
- To: program-l@xxxxxxxxxxxxx
- Date: Mon, 19 Mar 2012 10:07:57 -0800
Actually, std::string need not be null terminated internally. (It can
in fact store sequences with embedded NUL characters). An
implementation is of course free to tack a NUL character on the end,
and that does make implementing std::basic_string<>::c_str() quite a
bit easier, but it's no requirement of the standard to do so.
On 3/19/12, Joseph Lee <joseph.lee22590@xxxxxxxxx> wrote:
> Hi,
> That's correct - a string is a special case of a dynamic array -
> in this case, a dynamic array of characters. Internally, strings
> are stored as c-strings (a NULL terminated array of characters)
> which can be initialized to either an empty string, some literals
> (some string) or a copy of another. This constructor principle
> can be applied to unsigned character vector, which "emulates"
> strings. Also, since strings are dynamic arrays (which vectors
> are also known), you can add and remove characters from the back,
> hence my algorithm on vector traversal and pushing back each
> character to the end of the string.
> As for character pointer (rather, dereferencing them), if you
> know the address of the first letter of the string, then you can
> use pointer arithmetic to get to the required address and find
> out wh't lives there (but that's getting too technical now). For
> now, I think our suggestions would suffice for Tim's scenario.
> Cheers,
> Joseph
> ----- Original Message -----
> From: Mark Long <markalong64@xxxxxxxxxxx
> To: <program-l@xxxxxxxxxxxxx
> Date sent: Mon, 19 Mar 2012 17:13:50 +0000
> Subject: [program-l] Re: c++ byte vector to string conversion
>
>
> Hi Lubos
> Unless I have misunderstand, the constructor of the string class
> does just that.
> Cheers
> Mark
>
> Date: Mon, 19 Mar 2012 15:32:44 +0100
> From: lubos.pintes@xxxxxxxxx
> To: program-l@xxxxxxxxxxxxx
> Subject: [program-l] Re: c++ byte vector to string conversion
>
> But he needs to convert vector<unsigned char> to string, at
> least this
> is how I understood his question.
> Does this mean that it is possible to typecast vector.begin() to
> (char *)?
> Dňa 19. 3. 2012 13:08, Mark Long wrote / napísal(a):
> One of the constructor overloads for the string class is *char
> so you
> just need to pass the char* in when you create the string
> object.
>
> Mark
>
> Date: Mon, 19 Mar 2012 11:58:51 +0100
> From: lubos.pintes@xxxxxxxxx
> To: program-l@xxxxxxxxxxxxx
> Subject: [program-l] Re: c++ byte vector to string conversion
>
> I would try something like this:
> #include <algorithm
> Assume v is a vector<unsigned char> and s is a string
> then algorithm
> copy(v.begin(), v.end(), s.begin());
> could do this. Note that I didn't test this. It may be
> necessary to set
> a capacity of string s to match size of vector v.
> Dňa 19. 3. 2012 1:16, Tim Burgess wrote / napísal(a):
>
> Hi,
>
> I have a library call that returns a std::vector <unsigned
> char>,
> which I need to bring into an s td::string - does anybody have
> an
> algorithm, please?
>
> Best wishes.
>
> Tim Burgess
>
> Raised Bar Ltd
>
> Phone: +44 (0)1827 719822
>
> Don't forget to vote for improved access to music and music
> technology at
>
> http://www.raisedbar.net/petition.htm
>
>
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--
Soronel Haetir
soronel.haetir@xxxxxxxxx
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