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std::set::key_comp(3) C++ Standard Libary std::set::key_comp(3) NAME std::set::key_comp - std::set::key_comp Synopsis key_compare key_comp() const; Returns the function object that compares the keys, which is a copy of this container's constructor argument comp. It is the same as value_comp. Parameters (none) Return value The key comparison function object. Complexity Constant. Example // Run this code #include <cassert> #include <iostream> #include <set> // Example module 97 key compare function struct ModCmp { bool operator()(const int lhs, const int rhs) const { return (lhs % 97) < (rhs % 97); } }; int main() { std::set<int, ModCmp> cont{1, 2, 3, 4, 5}; auto comp_func = cont.key_comp(); for (int key : cont) { bool before = comp_func(key, 100); bool after = comp_func(100, key); if (!before && !after) std::cout << key << " equivalent to key 100\n"; else if (before) std::cout << key << " goes before key 100\n"; else if (after) std::cout << key << " goes after key 100\n"; else assert(0); // Cannot happen } } Output: 1 goes before key 100 2 goes before key 100 3 equivalent to key 100 4 goes after key 100 5 goes after key 100 See also value_comp returns the function that compares keys in objects of type value_type (public member function) http://cppreference.com 2022.07.31 std::set::key_comp(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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