Ichthyostega
e2ee8f081b
Helps avoiding dependency problems, because client code is no longer coupled to the implementation class
163 lines
4.9 KiB
C++
163 lines
4.9 KiB
C++
/*
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SingletonSubclass(Test) - actually creating a subclass of the Singleton Type
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Copyright (C) CinelerraCV
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2007, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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#include "common/testtargetobj.hpp"
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#include "common/singletonsubclass.hpp"
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#include "common/test/run.hpp"
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#include "common/util.hpp"
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#include <boost/lexical_cast.hpp>
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#include <boost/format.hpp>
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#include <iostream>
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using boost::lexical_cast;
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using boost::format;
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using util::isnil;
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using std::string;
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using std::cout;
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namespace cinelerra
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{
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namespace test
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{
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/**
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* Target object to be instantiated as Singleton
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* Allocates a variable amount of additional heap memory
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* and prints diagnostic messages.
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*/
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class Interface : public TestTargetObj
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{
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public:
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static int cnt;
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static void setCountParam (uint c) { Interface::cnt = c; }
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virtual string identify() { return "Interface"; }
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protected:
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Interface () : TestTargetObj(cnt) {}
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virtual ~Interface() {}
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friend class singleton::StaticCreate<Interface>;
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friend class singleton::HeapCreate<Interface>;
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};
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int Interface::cnt = 0;
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class Impl : public Interface
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{
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public:
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virtual string identify() { return "Implementation"; }
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};
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// for checking the safety.....
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class Impl_XXX : public Impl { };
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class Unrelated { };
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/*******************************************************************
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* @test spezialized variant of the Singleton Factory, for creating
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* subclasses (implementation classes) without coupling the
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* caller to the concrete class type.
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* Expected results: an instance of the subclass is created.
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* @see cinelerra::Singleton
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* @see cinelerra::SingletonSubclassFactory
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* @see cinelerra::singleton::Adapter
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*/
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class SingletonSubclass_test : public Test
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{
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virtual void run(Arg arg)
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{
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uint num= isnil(arg)? 1 : lexical_cast<uint>(arg[1]);
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cout << format("using the Singleton should create TargetObj(%d)...\n") % num;
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Interface::setCountParam(num);
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// marker to declare the concrete type to be created
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singleton::UseSubclass<Impl> typeinfo;
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// define an instance of the Singleton factory,
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// spezialized to create the concrete Type passed in
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SingletonSubclassFactory<Interface> instance (typeinfo);
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// Now use the Singleton factory...
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// Note: we get the Base type
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Interface& t1 = instance();
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Interface& t2 = instance();
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ASSERT ( &t1 == &t2, "not a Singleton, got two different instances." );
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cout << "calling a non-static method on the Singleton-"
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<< t1.identify() << "\n"
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<< string (t1) << "\n";
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#ifdef DEBUG
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verify_error_detection ();
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#endif
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}
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void verify_error_detection ()
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{
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singleton::UseSubclass<Impl_XXX> more_special_type;
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try
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{
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SingletonSubclassFactory<Interface> instance (more_special_type);
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cout << "was able to re-configure the SingletonSubclassFactory "
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"with another type. This should be detected in debug mode\n";
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}
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catch (...)
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{
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ASSERT (cinelerra_error () == error::CINELERRA_ERROR_ASSERTION);
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}
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// Note: the following won't compile, because the "subclass" isn't a subclass...
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//
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// singleton::UseSubclass<Unrelated> yet_another_type;
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// SingletonSubclassFactory<Interface> instance (yet_another_type);
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}
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};
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/** Register this test class... */
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LAUNCHER (SingletonSubclass_test, "unit common");
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} // namespace test
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} // namespace cinelerra
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