G++ ReadOnly Property

参照したWebはもう見つけられないので、メモをのこす。
=== ReadOnly.h ===

#ifndef __READONLY_H__
#define __READONLY_H__
class ReadOnly {
	public:
		ReadOnly();
		~ReadOnly() throw();

		const int &Readonly_int; 
		const char * const Readonly_char_p;

		void set_int(int n);
		void set_char(char* p);
	private:
		int rw_int;
		char rw_char_p[1000];
};
#endif

=== ReadOnly.cpp ===

#include 
#include 
#include 
#include "ReadOnly.h"

ReadOnly::ReadOnly():Readonly_int(rw_int),Readonly_char_p(rw_char_p)  {}

ReadOnly::~ReadOnly() throw(){}

void ReadOnly::set_int(int n){
	rw_int = n;
}
void ReadOnly::set_char(char* p){
	strcpy(rw_char_p,p);
}

=== test_ReadOnly.cpp　===

#include 
#include 
#include "ReadOnly.h"
char w[] ="World";
int main(int argc,char ** argv){
	ReadOnly ro;
	ro.set_int(999);
	ro.set_char("Hello");
	printf("int:%d char:%s\n",ro.Readonly_int,ro.Readonly_char_p);
	// the following three can't be compiled
//	ro.Readonly_int = 100; // assignment of read-only location
//	ro.Readonly_char_p[0] = '\0'; // assignment of read-only location
//	ro.Readonly_char_p = w; // assignment of read-only data-member `ReadOnly::Readonly_char_p'
	return EXIT_SUCCESS;
}