Template Method in C++
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Watch Template Method's video tutorialTemplate Method design pattern
- Standardize the skeleton of an algorithm in a base class "template method"
- Steps requiring peculiar implementations are "placeholders" in base class
- Derived classes implement placeholder methods
#include <iostream>
using namespace std;
class Base
{
void a()
{
cout << "a ";
}
void c()
{
cout << "c ";
}
void e()
{
cout << "e ";
}
// 2. Steps requiring peculiar implementations are "placeholders" in base class
virtual void ph1() = 0;
virtual void ph2() = 0;
public:
// 1. Standardize the skeleton of an algorithm in a base class "template method"
void execute()
{
a();
ph1();
c();
ph2();
e();
}
};
class One: public Base
{
// 3. Derived classes implement placeholder methods
/*virtual*/void ph1()
{
cout << "b ";
}
/*virtual*/void ph2()
{
cout << "d ";
}
};
class Two: public Base
{
/*virtual*/void ph1()
{
cout << "2 ";
}
/*virtual*/void ph2()
{
cout << "4 ";
}
};
int main()
{
Base *array[] =
{
&One(), &Two()
};
for (int i = 0; i < 2; i++)
{
array[i]->execute();
cout << '\n';
}
}
a b c d e
a 2 c 4 e
