#include <string>
using std::string;
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
void My Function(string ParameterOne, string ParameterTwo)
{
int i, j;
string MyString = "hello";
}
This chokes on the last line and says "error: 'string' undeclared (first
use in this function). What am I doing wrong? 7 1213
Made 3 changes:
1) Got rid of #include <gmp.h>
2) Fixed typo in function definition
3) Put in "main".
The following should and does compile:
#include <string>
using std::string;
#include <stdio.h>
#include <stdlib.h>
//#include <gmp.h>
void MyFunction(string ParameterOne, string ParameterTwo)
{
int i, j;
string MyString = "hello";
}
int main()
{
}
-JKop
JKop <NU**@NULL.NULL> wrote in news:1E*****************@news.indigo.ie: Made 3 changes:
1) Got rid of #include <gmp.h>
2) Fixed typo in function definition
3) Put in "main".
The following should and does compile:
#include <string>
using std::string;
#include <stdio.h> #include <stdlib.h>
//#include <gmp.h>
Stylistic point to consider....
I'd move all of your using declarations after _all_ includes. If you
don't, you may inadvertantly bring in a bad symbol lookup (or
ambiguity)....
In article <Xn*******************************@207.35.177.135> ,
Andre Kostur <nn******@kostur.net> wrote: JKop <NU**@NULL.NULL> wrote in news:1E*****************@news.indigo.ie:
Made 3 changes:
1) Got rid of #include <gmp.h>
2) Fixed typo in function definition
3) Put in "main".
The following should and does compile:
#include <string>
using std::string;
#include <stdio.h> #include <stdlib.h>
//#include <gmp.h>
Stylistic point to consider....
I'd move all of your using declarations after _all_ includes. If you don't, you may inadvertantly bring in a bad symbol lookup (or ambiguity)....
I disagree. I find that
#include <string>
using std::string
#include <vector>
using std::vector
#include <...>
using ...
much much more legible than what you propose, and the risk of ambiguity is low
(so low, in fact, that I have never run into this problem, and I use STL and
boost heavily).
meeroh
--
If this message helped you, consider buying an item
from my wish list: <http://web.meeroh.org/wishlist>
[...] The following should and does compile:
#include <string>
using std::string;
#include <stdio.h> #include <stdlib.h>
//#include <gmp.h>
Stylistic point to consider....
I'd move all of your using declarations after _all_ includes. If you don't, you may inadvertantly bring in a bad symbol lookup (or ambiguity)....
Bad symbol lookup or ambiguity. Sure? Interesting!!!
Mark
--
[ C++ FAQ: http://www.parashift.com/c++-faq-lite/ ]
"Miro Jurisic" <ma****@meeroh.org> wrote in message
news:ma**************************@senator-bedfellow.mit.edu... I disagree. I find that
#include <string> using std::string
#include <vector> using std::vector
#include <...> using ...
much much more legible than what you propose, and the risk of ambiguity is
low (so low, in fact, that I have never run into this problem, and I use STL
and boost heavily).
Beauty is in the eye of the beholder. I prefer this order: application
headers, standard headers, using declarations/directives. The elimination
of potential ambiguities/hidden dependencies is an added bonus.
--
David Hilsee
Mark <ma**********@hotmail.com> wrote in
news:jr********************************@4ax.com: [...] The following should and does compile:
#include <string>
using std::string;
#include <stdio.h> #include <stdlib.h>
//#include <gmp.h>
Stylistic point to consider....
I'd move all of your using declarations after _all_ includes. If you don't, you may inadvertantly bring in a bad symbol lookup (or ambiguity)....
Bad symbol lookup or ambiguity. Sure? Interesting!!!
If you have an unqualified identifier in a subsequent header file, which
namespace does it come from? Let's assume:
/// a.h
extern void fn(string str);
/// a.cpp
#include <string>
using std::string;
#include "a.h"
void fn(string str)
{
}
/// b.cpp
#include <customstring>
using customstring::string;
#include "a.h"
void bfn()
{
fn("");
}
What happens in b.cpp?
On Wed, 21 Jul 2004 15:43:33 GMT, Andre Kostur <nn******@kostur.net>
wrote:
[...] Bad symbol lookup or ambiguity. Sure? Interesting!!!
If you have an unqualified identifier in a subsequent header file, which namespace does it come from? Let's assume:
/// a.h
extern void fn(string str);
/// a.cpp
#include <string> using std::string;
#include "a.h"
void fn(string str) { }
/// b.cpp
#include <customstring> using customstring::string;
#include "a.h"
void bfn() { fn(""); } What happens in b.cpp?
Point taken. As I understand the example, it boils down to which
namespace, hence the ambiguity.
Mark
--
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