[Boost-users] Questions about boost with a vector of pair

From: yinglcs2_at_[hidden]
Date: 2006-03-02 15:18:34

I am trying to write a function with takes a vector of
pair and an key (integer). 
it should return true if the input key matches the
FIRST value of the map.

bool containsPair(vector< pair<int, int> >& aMap, int
key ) {
return ( find_if ( aMap.begin(), aMap.end(),  bind(
equal_to<int>(),  boost::lambda::bind( &pair< int,
int>::first_type::first, boost::lambda::_1) , key )  )
!=  aMap.end());
        
}
But i cant' get the code to compile.
I have this error:

../RowColumn1_4PatternMatcherHelper.h: In function
‘bool containsPair(std::vector<std::pair<int, int>,
std::allocator<std::pair<int, int> > >&, int)’:
../RowColumn1_4PatternMatcherHelper.h:62: error:
‘struct std::pair<int, int>::first_type’ is not a
class or namespace
../RowColumn1_4PatternMatcherHelper.h:62: error:
‘first’ was not declared in this scope
make: *** [TestDriver.o] Error 1

any help is appreciated.

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