c++,高级20_cpp primer重载下标操作符代码示范

c++,高级20_cpp primer重载下标操作符代码示范

#define  _CRT_SECURE_NO_WARNINGS
#include //下标操作，显示单个字符
#include 
using namespace std;//下标操作符重载

class String
{
public:
	String(char const *chars="");

	char &operator[](std::size_t index) throw(String);//可变成员函数重载
	char operator[](std::size_t index) const throw(String);  //const下标重载-不可变
	void print();
private:
	char *ptrChars;
	static String errorMessage;

};
void String::print()
{
	cout = std::strlen(ptrChars))
		throw errorMessage;

	return ptrChars[index];
}
String::String(char const *chars)//常量字符串，不能修改
{
	chars = chars ? chars : "";
	ptrChars = new char[std::strlen(chars)+1];
	std::strcpy(ptrChars,chars);
}

int main()
{
	String s("Hello");
	//cout