// Exercise1.cpp : Diese Datei enthält die Funktion "main". Hier beginnt und endet die Ausführung des Programms.
//
#include <iostream>

class String
{
public: 
	String (const char * string)
	{
		m_length = strlen(string);
		m_value = new char[m_length + 1];
		memcpy(m_value, string, m_length + 1);
	}

	~String()
	{
		delete[] m_value; 
	}

	size_t GetLength() const
	{
		return m_length; 
	}

	const char* c_str() const
	{
		return m_value; 
	}

	void Concatenate(const String& str)
	{
		Concatenate(str.c_str()); 
	}

	///Used this solution: https://puu.sh/BVyEB/f697b8b781.png
	void Concatenate(const char* str)
	{
		const auto n_length = strlen(str);
		const auto n_string = new char[m_length + n_length + 1]; //Add the old length and the new length + 1 for \0
		memcpy(n_string, m_value, m_length);
		memcpy(n_string + m_length, str, n_length + 1);
		delete[] m_value; //Delete the old HeapMem to save the new pointer in the next line 
		m_value = n_string;
		m_length += n_length;
	}


private:
	char* m_value;
	size_t m_length; 
};

int main()
{
	const auto str = "MyVision";
	const String yourString(str);

	String myString("Hello");
	myString.Concatenate("World");

	const auto m_length = myString.GetLength();
	const auto y_length = yourString.GetLength();
	std::cout << m_length << std::endl;
	std::cout << y_length << std::endl;
	
	myString.Concatenate(yourString);
	const auto b_length = myString.GetLength();
	std::cout << b_length << std::endl; 

	const char* cStr = myString.c_str();
	std::cout << cStr;
}