STL Map problem

krishnacins · 04-19-2006, 04:48 AM

Hi,
I want to use a map variable like ...
map<int(Key), string(val)> mymap;
it gives error.......when i insert the value using insert function.

plz guide me that how can i use int value for the Key in map... that i can insert the value according int key

thanks & regards
Krishna

dmail · 04-19-2006, 05:02 AM

Hmmm as far as I am aware you don't need a comp func because you are dealing with keys which are ints, so how are you trying to insert and what's the error you get?

krishnacins · 04-19-2006, 05:14 AM

if im using like ...
map<int, char*> mymap;

mymap.insert(1,"hello");
it gives this error.....

error: no matching function for call to `std::map<int,
char*, std::less<int>, std::allocator<std:

air<const int, char*> > >::
insert(int, char[50])'
/usr/include/c++/3.3.3/bits/stl_map.h:340: error: candidates are:
std:

air<typename std::_Rb_tree<_Key, std:

air<const _Key, _Tp>,
std::_Select1st<std:

air<const _Key, _Tp> >, _Compare, _Alloc>::iterator,
bool> std::map<_Key, _Tp, _Compare, _Alloc>::insert(const std:

air<const
_Key, _Tp>&) [with _Key = int, _Tp = char*, _Compare = std::less<int>,
_Alloc = std::allocator<std:

air<const int, char*> >]

dmail · 04-19-2006, 05:43 AM

hmm that char* could be another problem.

try:

Code:

char* str = new char[6];
*str = "hello\0";
mymap[1] = str;

but dont forget to clean up the pointer or better still use a std::string.

lol I do alot of "hmmm"ing

krishnacins · 04-20-2006, 12:23 AM

#include <map>
#include <iostream>
#include <string>
using namespace std;

int main()
{
typedef map<int,string> MYMAP;
MYMAP myMap;
myMap.insert(MYMAP::value_type(1,"Sanjay"));
myMap.insert(MYMAP::value_type(2,"Kumar"));
MYMAP::iterator iter;
for(iter = myMap.begin(); iter != myMap.end(); iter++)
{
cout<< "Name : " << (*iter).second << endl;
}
}