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

22 Feb 2006


      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