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I have a couple questions about how to use C++ sets (std::set)
Is there a way to get the union, intersection, or difference of two C++ sets? (It's pretty easy to write my own functionto do that but I wanted to know if there was a built in function for it)
Can C++ sets be used as keys in a map?
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What is the difference between union and intersection? A union of sets produces a new set containing each element present in the original sets. An intersection of sets produces a new set that contains only the elements that the original sets have in common.
Intersection: Elements two sets have in common. Union: All the elements from both sets. Difference: Elements present on one set, but not on the other.
Use the set_difference(), set_union(), set_intersection() and set_symmetric_difference() functions.
Sets and maps support any key type that can compare. By default this means the type has operator<() defined, but you can provide your own comparator. C++ sets don't have operator<() defined and therefore can't be used as keys unless you provide your own comparator.
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