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]

#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?

It is defined in <string>. The header <iostream> evidently includes
<string> on your implementation.

HTH,
--ag

 

[Joe Laughlin]

It is defined in <string>. The header <iostream>
evidently includes <string> on your implementation.

HTH,
--ag

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

 

[Artie Gold]

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

Yes. If you use *anything* from the standard library, *always* include
the header in which it is defined.

HTH,
--ag

 

[JKop]

Joe Laughlin posted:

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

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]

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

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

- J.