Hi Team

i am struggling to implement two things on this class,

1) to define a property when creating a modifier for using std::map<K, V> that one K is an int and V string.

2).how to create a test function inside a class?

- this class must first get a property being define first and declared using this standard library std::find, map<K, V>

-how to implement assign void method using a loop?

-the assign void method must be called from the test function, in order to check all test functions are met within a class and be able to compile without any errors.

// Attempt from the code

#include <map>
template<typename K, typename V>
class interval_map {
	friend void IntervalMapTest();
	V m_valBegin;
	std::map<K,V> m_map;
public:
	// constructor associates whole range of K with val
	interval_map(V const& val)
	: m_valBegin(val)
	{}

	// Assign value val to interval [keyBegin, keyEnd).
	// Overwrite previous values in this interval.
	// Conforming to the C++ Standard Library conventions, the interval
	// includes keyBegin, but excludes keyEnd.
	// If !( keyBegin < keyEnd ), this designates an empty interval,
	// and assign must do nothing.
	void assign( K const& keyBegin, K const& keyEnd, V const& val ) {

	}

	// look-up of the value associated with key
	V const& operator[]( K const& key ) const {
		auto it=m_map.upper_bound(key);
		if(it==m_map.begin()) {
			return m_valBegin;
		} else {
			return (--it)->second;
		}
	}
};