2009/2/27 钱晓明

I have a struct: struct Coordinate { double x, y, z; }; There is no any operator definition for it.

I want to sort a array of this struct with 3 elements by comparing the Z value, so: Coordinate coords[3]; ....... std::sort(coords, coords+3, _1 < _2); What should I write to replace "_1 < _2" here? How can I reference the Z member of _1 and _2? I hope I can sort this array without defining any new function.

bind(&Coordinate::z, _1) < bind(&Coordinate::z, _2) Roman Perepelitsa.