[Worldforge-all-lists] [WF-Cpptraining] STL: map

[Jonathan W <jwi...@ea...>]

Did I briefly go over maps and multimaps?

A map contains elements in key/value pairs.  In
the following example, a first name is paired
with an age.  multimaps is like maps except that
multiple keys are excepted.

Here is an example with maps:

#include <iostream>
#include <map> // needed to use maps
#include <string>

using namespace std;
int main()
{
     map<string,int> ageMap;

     // insert values
     ageMap["Adam"]=23;
     ageMap["Bob"]=45;
     ageMap["Christy"]=26;

     // print values
     map<string,int>::iterator pos; //pos for position
     for(pos=ageMap.begin(); pos!=ageMap.end(); pos++)
     {
         cout << "Name: " << pos->first << "\t\tAge: "
             << pos->second << endl;
     }

     return 0;
}

It can also define a typedef (alias) as being type
map<string,int>, to make sure that the iterator and
the map is created the same.  For example:

     typedef<string,int> StringIntMapType;

then:
     StringIntMapType ageMap;
and later:
     StringIntMapType::iterator pos;

--Jonathan Williford


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