builder-qualifier-support-test.cpp

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/*
  BuilderQualifierSupport(Test)  -  demonstrate accepting arbitrary qualifier terms on a builder function
 
   Copyright (C)
     2022,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2 of the License, or (at your
 option) any later version. See the file COPYING for further details.
 
* *****************************************************************/
 
#include "lib/test/run.hpp"
#include "lib/builder-qualifier-support.hpp"
#include "lib/test/test-helper.hpp"
 
#include <string>
 
 
namespace lib {
namespace test{
  
  using std::string;
  
  
  namespace { // example strategy to use the builder-qualifier-support...
    
    
    class ExampleStrategy
      : BuilderQualifierSupport<ExampleStrategy>
      {
        
        friend Qualifier one();
        friend Qualifier two(string);
        
      public:
        ExampleStrategy() = default;
        
        template<class... QS>
        ExampleStrategy(Qualifier qual, QS... qs)
          : ExampleStrategy{}
          {
            qualify(*this, qual, qs...);
          }
        
        operator string ()  const
          {
            return "Strategy{"+prop_+"}";
          }
        
      private:
        string prop_{"∅"};
      };
    
    
    ExampleStrategy::Qualifier
    one()
    {
      return ExampleStrategy::Qualifier{[](ExampleStrategy& strategy)
                                            {
                                              strategy.prop_ = "!one!";
                                            }};
    }
    
    ExampleStrategy::Qualifier
    two(string additionalArg)
    {
      return ExampleStrategy::Qualifier{[=](ExampleStrategy& strategy)
                                            {
                                              strategy.prop_ += ".two("+additionalArg+")";
                                            }};
    }
    
  }//(End)Test example
  
  
  
  /***********************************************************************************/
  class BuilderQualifierSupport_test : public Test
    {
      
      void
      run (Arg)
        {
          ExampleStrategy f0;
          CHECK (f0 == "Strategy{∅}"_expect);
          
          ExampleStrategy f1(one());
          CHECK (f1 == "Strategy{!one!}"_expect);
          
          ExampleStrategy f2(two("Ψ"));
          CHECK (f2 == "Strategy{∅.two(Ψ)}"_expect);
          
          ExampleStrategy f3(one(), two("↯"));
          CHECK (f3 == "Strategy{!one!.two(↯)}"_expect);
          
          ExampleStrategy f4(two("☭"), one());
          CHECK (f4 == "Strategy{!one!}"_expect);   // Note: evaluated from left to right, one() overwrites prop_
        }
    };
  
  
  LAUNCHER (BuilderQualifierSupport_test, "unit common");
  
  
}} // namespace lib::test