Thanks. I add the import and namespace, but I still get the same arror: ../Utils.h: In function âvoid keySet(T&, std::vector<int, std::allocator<int> >&)â: ../Utils.h:175: error: use of â_1â is ambiguous /usr/include/boost/lambda/core.hpp:69: error: first declared as âconst boost::lambda::placeholder1_type& boost::lambda::<unnamed>::_1â here --- nitin motgi <nitin.motgi@gmail.com> wrote:
template <class T> void keySet(T& aMap, vector<int>& keySet) { transform( aMap.begin(), aMap.end(), back_inserter(keySet), bind(&T::value_type::first, _1) );
}
here is the error: g++ -O0 -g3 -Wall -c -fmessage-length=0 -oBlockGrouper.o ../BlockGrouper.cpp ../Utils.h: In function 'void keySet(T&, std::vector<int, std::allocator<int> >&)': ../Utils.h:149: error: '_1' was not declared in this scope
Based on your errors it looks like _1 is not declared in the scope.
Did you miss adding these:
#include <boost/lambda/lambda.hpp> using boost::lambda::_1;
-- Nitin Motgi
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