On Tue, 2008-01-15 at 11:15 -0800, rob.ahlberg@gmail.com wrote:
> I got an integer what I trying to use with allegro function
> textout_ex() but it wants an char[]/char* as arg... And I really don't
> know how to cast it to one...

You don't cast your int, you convert it.

#include <sstream>
#include <ostream>

....

std:stringstream s;
s << my_int;
textout_ex(..., s.str().c_str(), ...);

or, if the allegro textout_ex function barfs due to something about
"const", try:

#include <vector>
#include <sstream>
#include <ostream>

....

std:stringstream s;
s << my_int;
std::vector<char> v(s.str().begin(), s.str().end());
v.push_back('\0');
textout_ex(..., &v[0], ...); // &v[0] is okay because v.size() >= 1

--
Tristan Wibberley

Any opinion expressed is mine (or else I'm playing devils advocate for
the sake of a good argument). My employer had nothing to do with this
communication.

On 15 Jan, 20:35, Tristan Wibberley <maihem-...@maihem.org> wrote:
> On Tue, 2008-01-15 at 11:15 -0800, rob.ahlb...@gmail.com wrote:
> > I got an integer what I trying to use with allegro function
> > textout_ex() but it wants an char[]/char* as arg... And I really don't
> > know how to cast it to one...
>
> You don't cast your int, you convert it.
>
> #include <sstream>
> #include <ostream>
>
> ...
>
> std:stringstream s;
> s << my_int;
> textout_ex(..., s.str().c_str(), ...);
>
> or, if the allegro textout_ex function barfs due to something about
> "const", try:
>
> #include <vector>
> #include <sstream>
> #include <ostream>
>
> ...
>
> std:stringstream s;
> s << my_int;
> std::vector<char> v(s.str().begin(), s.str().end());
> v.push_back('\0');
> textout_ex(..., &v[0], ...); // &v[0] is okay because v.size() >= 1
>
> --
> Tristan Wibberley
>
> Any opinion expressed is mine (or else I'm playing devils advocate for
> the sake of a good argument). My employer had nothing to do with this
> communication.

Yeah the programming guru at my school ed me with the string
stream. Unfortunately I cannot clear the string.. It's a little game
I'm currently at.. And I got a function to determine the fps.Then I
got 'int fps' And I do like:
ss << fps;
print(ss.str().c_str());
ss.flush();
But that's the problem... It wont clear the string. It just add the
new fps after the other one and so on. I need to clear it...

rob.ahlberg@gmail.com wrote:
> [..]
> Yeah the programming guru at my school ed me with the string
> stream. Unfortunately I cannot clear the string.. It's a little game
> I'm currently at.. And I got a function to determine the fps.Then I
> got 'int fps' And I do like:
> ss << fps;
> print(ss.str().c_str());
> ss.flush();
> But that's the problem... It wont clear the string. It just add the
> new fps after the other one and so on. I need to clear it...

This should clear the stream, IIRC:

ss.str().clear();

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

On Jan 16, 12:05 am, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
> rob.ahlb...@gmail.com wrote:
> > [..]
> > Yeah the programming guru at my school ed me with the string
> > stream. Unfortunately I cannot clear the string.. It's a little game
> > I'm currently at.. And I got a function to determine the fps.Then I
> > got 'int fps' And I do like:
> > ss << fps;
> > print(ss.str().c_str());
> > ss.flush();
> > But that's the problem... It wont clear the string. It just add the
> > new fps after the other one and so on. I need to clear it...

> This should clear the stream, IIRC:

> ss.str().clear();

I don't see how. stringstream::str() returns by value; calling
a member function on the temporary it returns can't have any
effect on the stream itself. There is a non const version of
str():
ss.str( std::string() ) ;
which would do the job, but frankly, the real solution is much
simpler: if you want a new ostringstream, use a new
ostringstream. (This is the sort of code which would be in a
function anyway, with the ostringstream as a local variable. So
each time you call the function, you get a new instance.)

--
James Kanze (GABI Software) email:james.kanze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

On 16 Jan, 00:05, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
> rob.ahlb...@gmail.com wrote:
> > [..]
> > Yeah the programming guru at my school ed me with the string
> > stream. Unfortunately I cannot clear the string.. It's a little game
> > I'm currently at.. And I got a function to determine the fps.Then I
> > got 'int fps' And I do like:
> > ss << fps;
> > print(ss.str().c_str());
> > ss.flush();
> > But that's the problem... It wont clear the string. It just add the
> > new fps after the other one and so on. I need to clear it...
>
> This should clear the stream, IIRC:
>
> ss.str().clear();
>
> V
> --
> Please remove capital 'A's when replying by e-mail
> I do not respond to top-posted replies, please don't ask

Aha.. I just wroted ss.clear();
Thanks for the

rob.ahlberg@gmail.com wrote:
> On 16 Jan, 00:05, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
>> rob.ahlb...@gmail.com wrote:
>>> [..]
>>> Yeah the programming guru at my school ed me with the string
>>> stream. Unfortunately I cannot clear the string.. It's a little game
>>> I'm currently at.. And I got a function to determine the fps.Then I
>>> got 'int fps' And I do like:
>>> ss << fps;
>>> print(ss.str().c_str());
>>> ss.flush();
>>> But that's the problem... It wont clear the string. It just add the
>>> new fps after the other one and so on. I need to clear it...
>>
>> This should clear the stream, IIRC:
>>
>> ss.str().clear();
>>
>> V
>> --
>> Please remove capital 'A's when replying by e-mail
>> I do not respond to top-posted replies, please don't ask
>
> Aha.. I just wroted ss.clear();
> Thanks for the

You probably need to do 'ss.clear()' as well, in case there are any
error bits set...

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask