Question

How to deep copy dynamic string with copy constructor in C++

Answer 1

#include <iostream>

using std::cout;
using std::endl;

class String {
private:
	char *s;
	int size;
public:
	String(const char *_s = NULL); 
	~String() { delete[] s; }
	String(const String&); // copy constructor
	void print() { cout << s << endl; } 
};

String::String(const char *_s)
{
	size = strlen(_s);
	s = new char[size + 1];
	strcpy(s, _s);
}

String::String(const String &copy_s)
{
	size = copy_s.size;
	s = new char[size + 1];
	strcpy(s, copy_s.s);
}

int main()
{
	String s1("c++");
	String s2 = s1; // copy constructor run

	s1.print(); 
	s2.print();

	return 0;
}

/*
run:

c++
c++

*/

 

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