student_info.cpp

来自「包括ARM开发环境的使用和一些调试用的源程序」· C++ 代码 · 共 24 行

#include <iostream>

#include "Student_info.h"
#include "Core.h"

using std::istream;

istream& Student_info::read(istream& is)
{
	char ch;
	is >> ch;     // get record type

	// allocate new object of the appropriate type
	// use `Handle<T>(T*)' to build a `Handle<Core>' from the pointer to that object
	// call `Handle<T>::operator=' to assign the `Handle<Core>' to the left-hand side
	if (ch == 'U')
		cp = new Core(is);
	else
		cp = new Grad(is);

	return is;
}