stl 学习笔记 9

 

vector 容器方法的例子

//stl/vectors1

/**//*
vector 的一些方法
*/
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

int main()
...{
    vector<string> sentence;
    sentence.reserve(5);

    sentence.push_back("Hello, ");
    sentence.push_back("how");
    sentence.push_back("are");
    sentence.push_back("you");
    sentence.push_back("?");

    copy(sentence.begin(),sentence.end(),ostream_iterator<string>(cout," "));
    cout <<endl;

    // max_size 方法
    cout <<"max_size(): "<<sentence.max_size() <<endl;

    //size()
    cout <<"size(): "<<sentence.size()<<endl;
    
    //capacity()
    cout <<"capacity(): "<<sentence.capacity()<<endl;

    // swap

    swap(sentence[1],sentence[3]);

    // insert
    // find
    sentence.insert(find(sentence.begin(),sentence.end(),"?"),"always");

    //? change to !
    sentence.back() = "!";

    copy(sentence.begin(),sentence.end(),ostream_iterator<string>(cout," "));

    cout <<endl;

    // max_size 方法
    cout <<"max_size(): "<<sentence.max_size() <<endl;

    //size()
    cout <<"size(): "<<sentence.size()<<endl;
    
    //capacity()
    cout <<"capacity(): "<<sentence.capacity()<<endl;
}

// result
/**//*
Hello,  how are you ?
max_size(): 153391689
size(): 5
capacity(): 5
Hello,  you are how always !
max_size(): 153391689
size(): 6
capacity(): 7
Press any key to continue
*/

 

 

 deque 容器的例子

//stl/deque1
#include <iostream>
#include <deque>
#include <string>
#include <algorithm>
using namespace std;

int main()
...{
    deque<string> coll;
    coll.assign(3,string("string"));
    coll.push_back("last string");
    coll.push_front("first string");

    copy(coll.begin(),coll.end(),ostream_iterator<string>(cout," "));

    cout <<endl;

    coll.pop_front();
    coll.pop_back();

    for(int i =1; i!=coll.size();++i)
        coll[i] = "another" + coll[i];

    coll.resize(4,"resized string");
    copy(coll.begin(),coll.end(),ostream_iterator<string>(cout," "));
}

//result
/**//*
first string
string
string
string
last string

string
anotherstring
anotherstring
resized string
*/