chapter6-25.cpp

STL程序员开发指南源码

//文件名:CHAPTER6-25.cpp
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
//create empty vector for strings
vector<string> sentence;
//reserve memory for five elements to avoid reallocation
sentence.reserve(5);
//append some elements
sentence.push_back("Hello,");
sentence.push_back("how");
sentence.push_back("are");
sentence.push_back("you");
sentence.push_back("?");
//print elements separated with spaces
copy (sentence.begin(), sentence.end(),
ostream_iterator<string>(cout," "));
cout << endl;
//print ''technical data''
cout << " max_size(): " << sentence.max_size() << endl;
cout << " size(): " << sentence.size() << endl;
cout << " capacity(): " << sentence.capacity() << endl;
//swap second and fourth element
swap (sentence[1], sentence [3]);
//insert element "always" before element "?"
sentence.insert (find(sentence.begin(),sentence.end(),"?"),"always");
//assign "!" to the last element
sentence.back() = "!";
//print elements separated with spaces
copy (sentence.begin(), sentence.end(),
ostream_iterator<string>(cout," "));
cout << endl;
//print "technical data" again
cout << " max_size(): " << sentence.max_size() << endl;
cout << " size(): " << sentence.size() << endl;
cout << " capacity(): " << sentence.capacity() << endl;
}