[C++] Class Template & Template Specialization

Class Template

 

• Class template is for type of members in class.

• Class template sets the type while constructing.

//member function defined inside the class
#include <iostream>
using namespace std;
 
template <class T>
class Simple{
private:
	T sign;
	int num;
public:
	Simple(T _sign, int _num):sign(_sign), num(_num)  {}
    
	void Print(){
		cout<<"sign : "<<sign<<endl;
		cout<<"num : "<<num<<endl;
	}
    
	void setSign(T sign){
		this->sign = sign;
	}
	void setNum(int num){
		this->num = num;
	}
};

//member function defined outside the class
#include <iostream>
using namespace std;
 
template <class T>
class Simple{
private:
	T sign;
	int num;
public:
	Simple(T _sign, int _num)
	void Print()
	void setSign(T sign)
	void setNum(int num)
};
 
template <class T>
Simple<T>::Simple(T _sign, int _num):sign(_sign), num(_num)  {}
 
template <class T>
void Simple<T>::Print(){
	cout<<"sign : "<<sign<<endl;
	cout<<"num : "<<num<<endl;
}
 
template <class T>
void Simple<T>::setSign(T sign){
	this->sign = sign;
}
 
template <class T>
void Simple<T>::setNum(int num){
	this->num = num;
}

 

 ※ Warnings

• When member function is declared outside of the class, you must declare template again. (it's kind of function template)
• When splitting the file 'Template Class's declaration & implementing' have to be in a same file.

 

Template Specialization

 

• Template specialization is for making another template function for a specific type.

template <class T>
T sum(T a, T b){
	return a + b;
}
 
template<>
char* sum<char*>(char* a, char* b){
	char* re = "error"
	cout<<"a :"<<a<<endl;
	cout<<"b :"<<b<<endl;
	return re;
}

 

 

 

 

 

 

 

 

 

[참고자료]

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