Re: [Boost-users] How to bind the first of a pair?

From: Kevin Heifner (heifner_k_at_[hidden])
Date: 2006-02-22 16:00:16

Meryl Silverburgh wrote:
> I have a map with key is a pair:
> typedef map < pair<int, int>, string> pairMapString;
> 	
> pair<int, int> key(1,3);
> map[key] = "one";
> 
> How can I create a binary function using boost lamba which check the
> first value of the pair of the key of the map?
> 
> void add(pairMapString;& myMap, int x) {
> 	
> 	iterator& itr = find_if(myMap.begin(), myMap.end(),
> 	bind(equal_to < int >(),  
> bind(&BlockDataPairMap::value_type::first::value_type::first, _1 ) , 
> x) );

   using namespace std;
   using namespace boost::lambda;

   typedef pair<int, int> intPair;
   typedef map < intPair, string> pairMapString;

   void add(pairMapString& myMap, int x) {
     pairMapString::iterator& itr = find_if(myMap.begin(), 
myMap.end(),
       bind(&intPair::first, 
bind(&pairMapString::value_type::first, _1)) == x);
   }

KevinH
-- 
Kevin Heifner  heifner @ ociweb.com  http://heifner.blogspot.com
           Object Computing, Inc. (OCI) www.ociweb.com