函数模板  类模板


类模板
template <typename type> ret-type func-name(parameter list){
  // 
}

类模板
template <class type> class class-name {
  //
}




#include <iostream>
#include <string>
 
using namespace std;
 
//  error: call to 'max' is ambiguous
template <typename T>
inline T const& getMax (T const& a, T const& b) { 
    return a < b ? b:a; 
} 

// 
template <class T>
class Pair {
  T value1, value2;
public:
  Pair (T first, T second) {
    value1=first;
    value2=second;
  }
  T getMax (){
    // 调用全局函数 加前缀 :: 
    return ::getMax(value1,value2);
  }
};

int main (){
    int int1 = 3;
    int int2 = 7;
    cout << "getMax(int,int)=" << getMax(int1,int2) << endl; 
 
    double double1 = 7.1; 
    double double2 = 3.3; 
    cout << "getMax(double,double): " << getMax(double1, double2) << endl; 
 
    string s1 = "hello"; 
    string s2 = "world"; 
    cout << "getMax(string, string): " << getMax(s1, s2) << endl; 
    
    Pair<int> intpair(int1,int2);
    Pair<double> doublepair(double1,double2);
    Pair<string> strpair(s1,s2);
    
    cout << intpair.getMax() << endl;
    cout << doublepair.getMax() << endl;
    cout << strpair.getMax() << endl;
   
    return 0;
}