C++ 函數模板和模板類

#include <QCoreApplication>

#include <iostream>

using namespace std;

//函數模板

template<typename T>

bool equivalent(const T&a, const T&b)

{

    return !(a<b)&& !(b<a);

}

//類模板

template<typename T=int>//默認參數

class Bignumber{

  typedef T value_type;

  public:

    Bignumber(value_type a):

        m_v(a)

        {

        }

    inline bool operator <(const Bignumber &obj)const

    {

        return m_v< obj.m_v;

    }

  private:

    value_type m_v;

};

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    Bignumber<> x(1), b(1);

    bool ret = equivalent(x,b);//函數模板自動推導

    cout<<ret<<endl;

    cout<<equivalent<double>(5,1);//函數模板特化

    while (1) {

    }

    return a.exec();

}