c++ and stl

G67 · 12-15-2003, 07:05 PM

hey, i had code compiled with gcc 2.x previously. Now the same code wont compile with the new gcc 3.x lib's. ??

the command i am using compile is
g++ -I ./stl/ program.cpp -o program

in addition programs that dont use STL give me some warnings about backwards compatibility.

How do i compile my older c++ programs using stl in gcc 3.x?

h/w · 12-15-2003, 07:28 PM

what are the errors u get while compiling?

dakensta · 12-16-2003, 05:23 PM

Are you using:
#include <headerfile.h> ?

if so, change this to:
#include <headerfile>

and either
1) qualify containers etc. with "std::container" when used
or
2) call "using std::container;"
3) call "using namespace std;"
before you use them.

Code:

#include <iostream>
int main()
{
std::cout << "Hello World" << std::endl;
}

or

Code:

#include <iostream>
int main()
{
using std::cout;
using std::endl;
// or using namespace std; for the lot
cout << "Hello World" << endl;
}

G67 · 12-17-2003, 02:21 AM

hi, thanks for the help, it worked.
I noticed a similar post after i posted mine, and i got some of the answers in there.

why did they make these changes?
was it not just easier to use cout instead of std::cout?

Thanks for help though.

chens_83 · 12-17-2003, 02:36 AM

Code:

using namespace std;

will automatically be put in for you.

Alot of the alien style warnings that it gives are things that the compiler is doing for you. Really hard to get rid of them, because you have to know what to look for.