Re: [Boost-users] How can I use boost::lambda bind libray in a template

From: yinglcs2_at_[hidden]
Date: 2006-02-22 20:01:20

Thanks. I add the import and namespace, but I still
get the same arror:

../Utils.h: In function ‘void keySet(T&,
std::vector<int, std::allocator<int> >&)’:
../Utils.h:175: error: use of ‘_1’ is ambiguous
/usr/include/boost/lambda/core.hpp:69: error:   first
declared as ‘const boost::lambda::placeholder1_type&
boost::lambda::<unnamed>::_1’ here

--- nitin motgi <nitin.motgi_at_[hidden]> 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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> 
> 
> --
> Nitin Motgi
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