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

22 Feb 2006


      Thanks.  I have problems compiling it.

../Test.cpp:74: error: invalid initialization of non-const reference
of type 'std::_Rb_tree_iterator<std::pair<const std::pair<int, int>,
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
...
...
&' from a temporary of type 'std::_Rb_tree_iterator<std::pair<const
std::pair<int, int>, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > > >'
../Test.cpp:71: warning: unused variable 'itr'
Here is my code:
main() {
	 typedef pair<int, int> intPair;
   typedef map < intPair, string> pairMapString;

	int x = 3;
pairMapString myMap;

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


On 2/22/06, Kevin Heifner <heifner_k@ociweb.com> wrote:
...
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
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