Ichthyostega
a90b9e5f16
In the Lumiera code base, we use C-String constants as unique error-IDs. Basically this allows to create new unique error IDs anywhere in the code. However, definition of such IDs in arbitrary namespaces tends to create slight confusion and ambiguities, while maintaining the proper use statements requires some manual work. Thus I introduce a new **standard scheme** * Error-IDs for widespread use shall be defined _exclusively_ into `namespace lumiera::error` * The shorthand-Macro `LERR_()` can now be used to simplify inclusion and referral * (for local or single-usage errors, a local or even hidden definition is OK)
154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
/*
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SingletonSubclass(Test) - actually creating a subclass of the Singleton Type
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Copyright (C) Lumiera.org
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2008, 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
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the 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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/** @file singleton-subclass-test.cpp
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** unit test \ref SingletonSubclass_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/format-string.hpp"
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#include "lib/format-cout.hpp"
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#include "lib/util.hpp"
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#include "test-target-obj.hpp"
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#include "lib/depend.hpp"
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#include "lib/depend-inject.hpp"
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#include <boost/lexical_cast.hpp>
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using boost::lexical_cast;
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using util::isSameObject;
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using util::_Fmt;
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using util::isnil;
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using std::string;
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namespace lib {
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namespace test{
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using LERR_(LIFECYCLE);
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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 lib::DependencyFactory<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 specific dependency-injection setup, to create a singleton
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* subclass (implementation class) instance, without coupling
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* the caller to the concrete type.
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* @remark Expected results: an instance of the subclass is created.
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* @see lib::Depend
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* @see lib/depend-inject.hpp
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*/
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class SingletonSubclass_test : public Test
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{
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virtual void
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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 << _Fmt("using the Singleton should create TargetObj(%d)...\n") % num;
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Interface::setCountParam(num);
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// configuration to use the subclass on demand
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DependInject<Interface>::useSingleton<Impl>();
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// define an instance of the Singleton factory as always...
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Depend<Interface> instance;
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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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CHECK (isSameObject (t1, t2), "not a Singleton, got two different instances." );
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CHECK ( INSTANCEOF (Impl,&t1)); // got the subclass as expected
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CHECK ("Implementation" == t2.identify());
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cout << "calling a non-static method on the Singleton-"
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<< t1.identify() << endl
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<< t1 << endl;
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verify_error_detection ();
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}
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void
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verify_error_detection ()
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{
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VERIFY_ERROR (LIFECYCLE, DependInject<Interface>::useSingleton<Impl_XXX>() );
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Depend<Interface> newFactory;
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CHECK ( INSTANCEOF (Impl, &newFactory() )); // works as before
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//////////does not compile due to incompatible baseclass
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// DependInject<Interface>::useSingleton<Unrelated>();
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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 lib::test
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