C++ 函数模板和模板类

#include <QCoreApplication>

#include <iostream>

using namespace std;

//函数模板

template<typename T>

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

{

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

}

//类模板

template<typename T=int>//默认参数

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);//函数模板自动推导

cout<<ret<<endl;

cout<<equivalent<double>(5,1);//函数模板特化

while (1) {

}

return a.exec();

}