stringseeking.cpp

来自「Thinking in C++(Second Editon)」· C++ 代码 · 共 37 行

//: C04:StringSeeking.cpp {-bor}{-dmc}
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Reads and writes a string stream.
#include <cassert>
#include <sstream>
#include <string>
using namespace std;

int main() {
  string text = "We will hook no fish";
  stringstream ss(text);
  ss.seekp(0, ios::end);
  ss << " before its time.";
  assert(ss.str() ==
    "We will hook no fish before its time.");
  // Change "hook" to "ship"
  ss.seekg(8, ios::beg);
  string word;
  ss >> word;
  assert(word == "hook");
  ss.seekp(8, ios::beg);
  ss << "ship";
  // Change "fish" to "code"
  ss.seekg(16, ios::beg);
  ss >> word;
  assert(word == "fish");
  ss.seekp(16, ios::beg);
  ss << "code";
  assert(ss.str() ==
    "We will ship no code before its time.");
  ss.str("A horse of a different color.");
  assert(ss.str() == "A horse of a different color.");
} ///:~