STL 练习

makefile

-------------------------------------

%.o : %.cpp
g++ -g -c $< -o $@
all: t t2 rmXX 
% : %.o
g++ $< -o $@
rmXX:
echo "rmXX"
rm *.o

--------------------------------

同目录头文件：

   hTestSTL.h

---------------------------------

#include<iostream>
using namespace std;
class A 
{
private:
int a;
int b;
public:
int aPlusB()
{
cout<<"a:"<<a<<endl;
cout<<"b:"<<b<<endl;
cout<<"b+b:"<<a+b<<endl;
return a+b;
};
void setA (int a)
{
this->a=a;
};
void setB(int b)
{
this->b=b;
};
};

class NodeInfo
{
private:
int beanId;
int value;
public:
NodeInfo()
{
cout<<"init bean"<<endl; 
};
void setBeanId(int id)
{
this->beanId=id; 
};
void setValue(int value)
{
this->value=value;
};
int getValue()
{
return this->value;
};
int getBeanId()
{
return this->beanId;
};

};

----------------------------

练习1

   t1.cpp   队列容器

-----------------------------

#include<iostream>
#include "hTestSTL.h"
#include<queue>

using namespace std;

queue<A> que;
void showHowUsingQueue()
{
   A a;
   A *p=&a;
   a.setA(100);
   a.setB(200);
   a.aPlusB();
   que.push(*p);
   
   a.setA(1000);
   a.setB(2000);
   a.aPlusB();
   que.push(*p);
   int tmp=0;
   A *tmp_p=0;
  
   while(!que.empty())
   {
     que.pop();   
     tmp_p=&que.front();   
     tmp_p->aPlusB();   
   }
   cout<<tmp;
};
int main(int c,char * argv[])
{
  
  showHowUsingQueue();
  cout<< "hello"<<endl;
  
  A a;
  a.setA(100);
  a.setB(200);
  a.aPlusB();
  int b ;
  cin >> b;
  return 0;
};

---------------------

练习2  t2.cpp    访函数  迭代  遍历

------------------------

#include<iostream>
#include "hTestSTL.h"
#include<list>
#include<iterator>
#include<algorithm>

using namespace std;

   void print( NodeInfo &elem)
   {
     cout<<elem.getValue()<<endl;
   };
struct Printer
{
    template<typename T> void operator()( T& t ) { cout<<"printer:"<<t.getValue()<<endl; }
};

struct Printer2
{
     void operator()( NodeInfo & t ) { cout<<"printer2:"<<t.getValue()<<endl; }
};
void showHowUsingList()
{
   list<NodeInfo> beanList;
   NodeInfo bean;
   for(int i=0;i<20;i++)
   {
       bean.setValue(i);
       beanList.push_back(bean);
   }
   for_each(beanList.begin(), beanList.end(), print) ;
   cout<<"test2"<<endl;
   for_each(beanList.begin(), beanList.end(), Printer()) ;
   cout<<"test3"<<endl;
   for_each(beanList.begin(), beanList.end(), Printer2()) ;
};

int main(int c,char * argv[])
{
  showHowUsingList();
  return 0;
};