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

2009/1/25 Michał Nowotka :

Right, there is a mistake.

So the problem is:

Suppose i defined: typedef std::vector* > MyType;

So if I want to keep DRY i should write:

lambda::_1 ->*&MyType::value_type::second > lambda::_2 ->*&MyType::value_type::second);

I also tried: bind(&MyType::value_type::second, lambda::_1) > bind(&MyType::value_type::second, lambda::_2)

but none of this expression works for me.

Well, it's hardly surprising, as the value_type of the vector is a pointer, so won't have a member called 'second'. Let's refactor the DRY-ness a little: typedef std::pair ElemType; typedef std::vector MyType; MyType v; Then you can use this: std::sort(v.begin(), v.end(), bind(&ElemType::second, _1) > bind(&ElemType::second, _2)); ? Stuart Dootson