Question

In order to store an object of a user defined type into a std::set, which operator must be defined for the type

Answer 1

The less-than operator (<) must be defined for the type.

Step-by-step explanation:

In order to store an object of a user defined type into a std::set, the less-than operator (<) must be defined for the type.

This is because std::set stores its elements in a sorted order based on the less-than operator. The set uses this operator to determine the relative order of objects in the set.

Here's an example:

class MyObject
{
int value;
public:
bool operator<(const MyObject& other) const
{
return value < other.value;
}
};

std::set<MyObject> mySet;

mySet.insert(MyObject{5});
mySet.insert(MyObject{2});
mySet.insert(MyObject{7});

Answer 2

you are in class 9 give me answer please