STL map declaration

[sspr]

hi

I need to declare a map globally and use it all over my project. I am declaring the map in a header file like this

map<string,string> gsObjForPrimaryMap;

and in another file i am using it as follows
extern map<string,string> gsObjForPrimaryMap;
typedef pair<string,string> mypair;

when i try to link the project it is giving me syntax error near the extern.
If i have to declare a map globally and use it am i doing the correct thing if not please correct me

thanks in advance

[wildfrog]

when i try to link the project it is giving me syntax error near the extern.
What syntax error?

- petter

[SuperKoko]

Be sure to include <map> and <string> in the header, before the declaration.
And, use explicit scope resolution:

extern std::map<std::string,std::string> gsObjForPrimaryMap;

And, remove, if there are any, all the using directives off your header!

[sspr]

I am sorry.... that was my mistake i could resolve it.
but now i have new problem i am not able to display the contents of the map.

i declared an iterator for the map like this
map<string,string>::iterator itr

and in my function i have wriiten a for loop as follows

for(itr = gsObjForPrimaryMap.begin();itr!=gsObjForPrimaryMap.end();itr++)
{
printf("%s",(*itr).first);
printf("\t%s\n",(*itr).second);
}

i am not getting any complie error. I am getting a run time error. I inserted a breakpoint and tried debugging i noticed that the pointer itr address is getting messed up some where

[Philip Nicoletti]

printf does not know how to print a std::string directly. Use the
std::string member fundtion c_str() to get something that
printf understands.


printf("%s",(*itr).first.c_str());
printf("\t%s\n",(*itr).second.c_str());

[wildfrog]

The printf %s expects a plain old (zero ended) c-string, not a c++ std::string:

for(itr = gsObjForPrimaryMap.begin();itr!=gsObjForPrimaryMap.end();itr++)
{
printf("%s",(*itr).first.c_str());
printf("\t%s\n",(*itr).second.c_str());
}

- petter

[sspr]

Thanks much the function .c_str() solved my problem