Re: [Boost-users] [lambda] std::sort problem

AMDG Michał Nowotka wrote:

Following code does not compile:

sort(m_results->begin(), m_results->end(), lambda::_1->second > lambda::_2->second);

where:

m_result is type of std::vector<std::pair<const SomeClass*,double>* >

vs2008 compiler says:

error C2780: 'void std::sort(_RanIt,_RanIt)' : expects 2 arguments - 3 provided, see declaration of 'std::sort'

but in lamda documentation there is similar example:

sort(vp.begin(), vp.end(), *_1 > *_2);

so what's wrong with my code

Boost.Lambda doesn't overload operator-> because C++ doesn't allow it to work in general. You have to do it like this (lambda::_1->*&std::pair<const SomeClass*,double*>::second) using member pointers. In Christ, Steven Watanabe