where is std::string defined?

[Joe Laughlin]

#include <iostream>

int main()
{
std::string hello = "Hello World\n";
return 0;
}


This compiles fine. Is std::string defined in cstring? Or is it included
in iostream?

Thanks,
Joe

[Artie Gold]

Re: where is std::string defined?

Joe Laughlin wrote:[color=blue]
> #include <iostream>
>
> int main()
> {
> std::string hello = "Hello World\n";
> return 0;
> }
>
>
> This compiles fine. Is std::string defined in cstring? Or is it included
> in iostream?
>[/color]
It is defined in <string>. The header <iostream> evidently includes
<string> on your implementation.

HTH,
--ag

--
Artie Gold -- Austin, Texas

"If you don't think it matters, you're not paying attention."

[Joe Laughlin]

Re: where is std::string defined?

Artie Gold wrote:[color=blue]
> Joe Laughlin wrote:[color=green]
>> #include <iostream>
>>
>> int main()
>> {
>> std::string hello = "Hello World\n";
>> return 0;
>> }
>>
>>
>> This compiles fine. Is std::string defined in cstring?
>> Or is it included in iostream?
>>[/color]
> It is defined in <string>. The header <iostream>
> evidently includes <string> on your implementation.
>
> HTH,
> --ag[/color]

Is it good practice to include the <string> header then?

[Artie Gold]

Re: where is std::string defined?

Joe Laughlin wrote:[color=blue]
> Artie Gold wrote:
>[color=green]
>>Joe Laughlin wrote:
>>[color=darkred]
>>>#include <iostream>
>>>
>>>int main()
>>>{
>>> std::string hello = "Hello World\n";
>>> return 0;
>>>}
>>>
>>>
>>>This compiles fine. Is std::string defined in cstring?
>>>Or is it included in iostream?
>>>[/color]
>>
>>It is defined in <string>. The header <iostream>
>>evidently includes <string> on your implementation.
>>
>>HTH,
>>--ag[/color]
>
>
> Is it good practice to include the <string> header then?
>
>[/color]
Yes. If you use *anything* from the standard library, *always* include
the header in which it is defined.

HTH,
--ag

--
Artie Gold -- Austin, Texas

"If you don't think it matters, you're not paying attention."

[JKop]

Re: where is std::string defined?

Joe Laughlin posted:
[color=blue]
> Artie Gold wrote:[color=green]
>> Joe Laughlin wrote:[color=darkred]
>>> #include <iostream>
>>>
>>> int main()
>>> {
>>> std::string hello = "Hello World\n";
>>> return 0;
>>> }
>>>
>>>
>>> This compiles fine. Is std::string defined in cstring?
>>> Or is it included in iostream?
>>>[/color]
>> It is defined in <string>. The header <iostream>
>> evidently includes <string> on your implementation.
>>
>> HTH,
>> --ag[/color]
>
> Is it good practice to include the <string> header then?[/color]


I'd advocate it!

I even go one step futher:


#include <cstddef>
#include <cstring>

inline std::size_t strlenPlusNull( const char* const str);
{
std::size_t temp = std::strlen(str );

return temp += 1;
}


The function "strlen" returns an object of type "std::size_ t". As such, if
you include the header that has "strlen" in it, then it simply must also
contain the definition of "std::size_ t". But still... I like to include
"cstddef", whose actual job it is to define "std::size_ t".

So for your program just there, I myself would do:

#include <iostream>
#include <string>


-JKop

[Jacek Dziedzic]

Re: where is std::string defined?

Joe Laughlin wrote:[color=blue]
> Is it good practice to include the <string> header then?[/color]

If you intend to use stuff declared in it -- yes, definitely!

- J.