(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.

 

• Download the Qt Creator project 'CppCtStrategyDesignPatternExampleDoIt' (zip)

 

 

 

 

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 12.10 (quantal)

IDE(s):

• Qt Creator 2.5.2

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.7.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.7.2

 

 

 

 

 

Qt project file: CppCtStrategyDesignPatternExampleDoIt.pro

 

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

 

 

 

 

 

main.cpp

 

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#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(); }