Re: [Boost-users] Defining less on member variables/functions

why do you want to sort ONLY on the 1st element of the pair? At Thursday 2004-03-25 11:34, you wrote:

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I've had this same pattern come up 4 or 5 times now, and each time I've been unable to find a stl + boost solution that allowed me to do what I want without writing my own less function. Basically, I want something that will let me do a sort, or define a map on structs or pairs without writing a less that compares the member variable or ..first. My last attempt:

vector> myVector std::sort(myVector.begin(), myVector.end(), _1.first < _2.first);

No such luck. It looks like I can do operator * and & on lambda objects, but not access members through them. Is there anything in boost, stl, or elsewhere that lets me not write this:

class myLess { bool operator() (pair a, pairb) {return a.first < b.first;} }

Thanks for any help, Chris

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