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(C++) Compile-time Strategy Design Pattern example: DoIt

 

Compile-time Strategy Design Pattern example: DoIt is a compile-time Strategy Design Pattern.

 

You can also employ a run-time Strategy Design Pattern.

 

 

 

 

 

 

Technical facts

 

Application type(s)

Operating system(s) or programming environment(s)

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Qt project file: CppCtStrategyDesignPatternExampleDoIt.pro

 

TEMPLATE = app
CONFIG += console
CONFIG -= qt
QMAKE_CXXFLAGS += -Wall -Wextra -Weffc++ -Werror
SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

#include <iostream>

///A compile-time Strategy Design Pattern
enum Policy { A, B };

template <Policy> struct Strategy
{
  static void DoIt();
};

template<> void Strategy<A>::DoIt()
{
  std::cout << "Do it the A way\n";
}

template<> void Strategy<B>::DoIt()
{
  std::cout << "Do it the B way\n";
}

int main()
{
  const Strategy<A> x; x.DoIt();
  const Strategy<B> y; y.DoIt();
}

 

 

 

 

 

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