Recently I learnt about comparators in cpp from STL.

I came to know we can use greater<>() as third argument for sorting instead of writing own logic.

Just curious to know how many inbuilt comparators are there in cpp.

CodePudding user response：

The standard library defines pretty much what you would expect as analogues to the built-in operators:

std::equal_to      // ==
std::not_equal_to  // !=
std::less          // <
std::less_equal    // <=
std::greater       // >
std::greater_equal // >=

Since C 20 also constrained versions of all these comparison function objects in the std::ranges namespace as well as std::compare_­three_­way, which is the analogue to the built-in three-way comparison operator <=>.

For a reference of these function objects see https://en.cppreference.com/w/cpp/utility/functional#Comparisons.