C++标准库Vector & Iterator用法
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http://blog.163.com/hbu_lijian/blog/static/12612915320120511849791/
//程序1
#include <iostream>
#include <vector>
//using namespace std;
using std::cin;
using std::cout;
using std::endl;
using std::vector;
using std::string;
//vector's demo class
class VectorDemo
{
private:
int num;
vector<int> ivec;
vector<string> svec;
public:
VectorDemo()
{
}
VectorDemo(int temp)
{
num = temp;
}
void VectorEssentialUse(void);
void IteratorEssentialUse(void);
};
void VectorDemo::VectorEssentialUse()
{
int i = 0;
for(i = 0; i < 3; i++)
{
ivec.push_back(i+1);
}
for(i = 0; i < 3; i++)
{
cout << ivec[i] << endl;
}
cout << "ivec_length = " << ivec.size() << endl;
ivec.clear();
cout << "ivec_length = " << ivec.size() << endl;
cout << "svec_length = " << svec.size() << endl;
for(i = 0; i < 3; i++)
{
svec.push_back("aaa");
}
cout << "svec_length = " << svec.size() << endl;
for(i = 0; i < 3; i++)
{
cout << svec[i] << endl;
svec.pop_back();
cout << "svec_length = " << svec.size() << endl;
}
vector<int> iv1(10);
vector<int> iv2(10,100);
vector<int> iv3(iv2);
for(i = 0; i < 10; i++)
{
iv1[i] = i;
cout << iv1[i] << " " << iv2[i] << " " << iv3[i] << endl;
}
return;
}
void VectorDemo::IteratorEssentialUse()
{
int i = 0;
for(i = 0; i < 3; i++)
{
ivec.push_back(i+1);
}
for(vector<int>::size_type i = 0; i != ivec.size(); i++)//essential loop
{
cout << ivec[i] << endl;
}
for(vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); iter++)//iterator loop
{
cout << *iter << endl;
*iter = 100000000;//iterator can change the value.
cout << *iter << endl;
}
return;
}
int main(int argc, char *argv[])
{
VectorDemo *p = new VectorDemo();
p->IteratorEssentialUse();
cout << "Application Run Successfully!" << endl;
return 0;
}
//程序2
#include <iostream>
#include <vector>
using std::cout;
using std::endl;
using std::cin;
using std::cerr;
using std::string;
using std::vector;
int main(int argc, char *argv[])
{
vector<int> myvector(3, 100);
vector<int>::iterator it;
for(it = myvector.begin(); it != myvector.end(); it++)
{
cout << *it << endl;
}
cout << endl;
it = myvector.begin();
it = myvector.insert(it, 200);
for(it = myvector.begin(); it != myvector.end(); it++)
{
cout << *it << endl;
}
cout << endl;
myvector.insert(it, 2, 300);
for(it = myvector.begin(); it != myvector.end(); it++)
{
cout << *it << endl;
}
// "it" no longer valid, get a new one:
it = myvector.begin();
vector<int> anothervector(2, 400);
myvector.insert(it + 2, anothervector.begin(), anothervector.end());
int myarray[] = { 501, 502, 503 };
myvector.insert(myvector.begin(), myarray, myarray + 3);
cout << "myvector contains:";
for (it = myvector.begin(); it < myvector.end(); it++)
cout << " " << *it;
cout << endl;
cout << "Application Run Successfully!" << endl;
return 0;
}
小结:
1.#include <vector> 并且 using std::vector;
2.所有的标准库容器类都定义了相应的iterator类型
3.定义一个vector
vector <int> vect;
vector <int> vect1(12);//12个int类型元素,每个元素的初始值均为0
vector <int> vect2(12,9);//12个int,初试值均为9
4.定义迭代器iterator
vector <int>::iterator iter=vt.begin();//起始地址
vector <int>::iterator iter_end=vt.end();//结束地址,两个地址都是指针类型
5.vector的一些基本方法(size(),insert(),push_back(),pop_back(),begin(),end())
6.const_iterator,只能用于读取容器内元素值,不能用于改变容器内元素值
7.迭代器基本操作:iter++,++iter,iter- -,--iter,iter+n,iter,-n,iter1-iter2
8.vector对象可用数组进行初始化
const size_t arr_size = 6;
int int_arr[arr_size] = {0,1,2,3,4,5};
//ivec has 6 elements:each a copy of the corresponding element in int_arr
vector<int> ivec(int_arr,int_arr + arr_size);
or
vector<int> ivec(int_arr + 1, int_arr +4);//copy 3 elements:int_arr[1],int_arr[2],int_arr[3]
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