exercise16.cpp

来自「很经典的书籍」· C++ 代码 · 共 32 行

//: C04:Exercise16.cpp
#include <fstream>
#include <iostream>
#include <sstream>
#include "../require.h"
using namespace std;
#define d(a) cout << #a " ==\t" << a << endl;

void tellPointers(fstream& s) {
  d(s.tellp());
  d(s.tellg());
  cout << endl;
}
void tellPointers(stringstream& s) {
  d(s.tellp());
  d(s.tellg());
  cout << endl;
}
int main() {
  fstream in("Exercise16.cpp");
  assure(in, "Exercise16.cpp");
  in.seekg(10);
  tellPointers(in);
  in.seekp(20);
  tellPointers(in);
  stringstream memStream("Here is a sentence.");
  memStream.seekg(10);
  tellPointers(memStream);
  memStream.seekp(5);
  tellPointers(memStream);
} ///:~