Reverse map lookup

Question

I have a 1 to 1 map. What\'s the best way to find keys from values,

i.e.

For examples if the map is this

KEY VALUE

a    1
b    2
c          


        

Answer 1

I know this is a really old question but this codeproject article (http://www.codeproject.com/Articles/3016/An-STL-like-bidirectional-map) is a pretty good example of a bidirectional map.

This is an example program that shows how easy it is:

 #pragma warning(disable:4503)

    #include "bimap.h"
    #include 
    #include 

    using codeproject::bimap;

    int main(void)
    {
      bimap bm;

      bm[1]="Monday";
      bm[2]="Tuesday";
      bm[3]="Wednesday";
      bm[4]="Thursday";
      bm[5]="Friday";
      bm[6]="Saturday";
      bm[7]="Sunday";

      std::cout<<"Thursday occupies place #"<