#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
void printVector(vector<int>& v)
{
for(vector<int>::iterator it = v.begin(); it != v.end(); it++)
{
cout << *it << " ";
}
cout << endl;
}
void test01()
{
vector<int> v1;
for(int i = 0; i < 10; i++)
{
v1.push_back(i);
}
printVector(v1);
vector<int> v2(v1.begin(), v1.end());
printVector(v2);
vector<int> v3(10, 100);
printVector(v3);
vector<int> v4(v3);
printVector(v4);
}
void test02()
{
vector<int> v2;
for(int i = 0; i < 10; i++)
{
v2.push_back(i);
}
printVector(v2);
vector<int> v3;
v3=v2;
printVector(v3);
vector<int> v4;
v4.assign(v2.begin(), v2.end());
printVector(v4);
}
void test03()
{
vector<int> v1;
for(int i = 0; i < 10; i++)
{
v1.push_back(i);
}
printVector(v1);
if(v1.empty())
{
cout << "vector is empty" << endl;
}
else
{
cout << "vector is not empty" << endl;
}
cout << "capacity:" << v1.capacity() << endl;
cout << "size:" << v1.size() << endl;
cout << "max_size:" << v1.max_size() << endl;
cout << "empty:" << v1.empty() << endl;
}
void test04()
{
vector<int> v1;
for(int i = 0; i < 10; i++)
{
v1.push_back(i);
}
printVector(v1);
v1.pop_back();
printVector(v1);
v1.insert(v1.begin(),100);
printVector(v1);
v1.insert(v1.begin(),2,1000);
printVector(v1);
v1.erase(v1.begin());
printVector(v1);
v1.erase(v1.begin(),v1.end());
printVector(v1);
}
void test05()
{
vector<int> v1;
for(int i = 0; i < 10; i++)
{
v1.push_back(i);
}
for(int i = 0; i < v1.size(); i++)
{
cout << v1[i] << " ";
}
for(int i = 0; i < v1.size(); i++)
{
cout << v1.at(i) << " ";
}
cout<<v1.front()<<endl;
cout<<v1.back()<<endl;
}
void test06()
{
vector<int> v1;
for(int i = 0; i < 10; i++)
{
v1.push_back(i);
}
printVector(v1);
vector<int> v2;
for(int i = 10; i < 20; i++)
{
v2.push_back(i);
}
printVector(v2);
v1.swap(v2);
printVector(v1);
printVector(v2);
}
void test07()
{
vector<int> v1;
for(int i = 0; i < 10000000; i++)
{
v1.push_back(i);
}
cout<<v1.capacity()<<endl;
cout<<v1.size()<<endl;
v1.resize(5);
cout<<v1.capacity()<<endl;
cout<<v1.size()<<endl;
vector<int>(v1).swap(v1); //shrink to fit
cout<<v1.capacity()<<endl;
cout<<v1.size()<<endl;
}
void test08()
{
vector<int> v1;
v1.reserve(1000000);
int num = 0;
int *p= NULL;
for(int i=0;i<1000000;i++)
{
v1.push_back(i);
if(p!=&v1[0])
{
p=&v1[0];
num++;
}
}
cout<<"num="<<num<<endl;
}
int main()
{
// test01();
// test02();
// test03();
// test04();
// test05();
// test06();
// test07();
test08();
system("pause");
}