C++ Template之多自定义参数实例化

简单写个示例：【VS2012编译运行通过】

头文件，定义一个类模板（含有虚函数）和需要用到的实例化参数类

#ifndef _PEOPLE_H
#define _PEOPLE_H


#include <iostream>
using namespace std;

class pq1;
class pq2;

template<class T,class D>
class people
{
public:
  T age;
  people()
  {}
  ~people()
  {}
  virtual void out()
  {
    cout<<"base"<<endl;
  }
  void print()
  {
    cout<<"base_print"<<endl;
  }
private:

};

class BlackP
{
public:
  BlackP();
  ~BlackP();
  void print();
  void b_print();

  static string area;

private:

};

BlackP::BlackP()
{
}

BlackP::~BlackP()
{
}

void BlackP::print()
{
  cout<<"b_self_print"<<endl;
}
void BlackP::b_print()
{
  cout<<"b_self_B_print"<<endl;
}

class  WhiteP
{
public:
   WhiteP();
  ~ WhiteP();
  void print();
  void w_print();

private:

};

 WhiteP:: WhiteP()
{
}

 WhiteP::~ WhiteP()
{
}

 void WhiteP::print()
 {
   cout<<"w_self_print"<<endl;
 }

 void WhiteP::w_print()
 {
   cout<<"w_self_W_print"<<endl;
 }

 class CommP
 {
 public:
   CommP();
   ~CommP();

 private:

 };

 CommP::CommP()
 {
 }

 CommP::~CommP()
 {
 }
#endif

CPP文件实例化类模板，并重写类模板中的虚函数

#ifndef _PEOPLE_H
#include"people.h"
#endif 

#include<string>

people<int,BlackP> p1;
people<double,WhiteP> p2;

string BlackP::area;
void people<int,BlackP>::out()
{
  cout<<"int_out"<<endl;
  //this->print();
  BlackP::area="africa";
  cout<<BlackP::area<<endl;//must include string.h if you want to cout string
  
  BlackP p;
  p.b_print();
}
void people<double,WhiteP>::out()
{
  cout<<"double_out"<<endl;

  WhiteP p;
  p.w_print();
}


int main()
{
  people<double,CommP> p0;
  p0.out();
  p0.print();

  p1.out();
  p1.print();
  


  p2.out();

  system("pause");
}