Ichthyostega
a344604f1b
Clang doesn't allow to declare a private nested class as friend. This is unfortunate, but likely correct to the letter of the standard. As a workaround, now we're creating the instances within a static function of DependencyFactory -- in the end this improves readability A second issue fixed with this changeset is the scope of the marker function. Clang is right, this isn't ADL, thus an inline friend definition is simply not visible outside the class.
147 lines
4.2 KiB
C++
147 lines
4.2 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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#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/util.hpp"
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#include "test-target-obj.hpp"
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#include "lib/depend.hpp"
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#include <boost/lexical_cast.hpp>
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#include <iostream>
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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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using std::cout;
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namespace lib {
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namespace test{
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using lumiera::error::LUMIERA_ERROR_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;
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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 specialised 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 lib::Depend
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* @see lib::buildSingleton()
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* @see lib/dependency-factory.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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// marker to declare the concrete type to be created
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DependencyFactory::InstanceConstructor factoryFunction = buildSingleton<Impl>();
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// define an instance of the Singleton factory,
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// specialised to create the concrete Type passed in
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Depend<Interface> instance (factoryFunction);
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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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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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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, Depend<Interface> instance (buildSingleton<Impl_XXX>()) );
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VERIFY_ERROR (LIFECYCLE, Depend<Interface> instance (buildSingleton<Unrelated>()) );
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Depend<Interface> newFactory;
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CHECK ( INSTANCEOF (Impl, &newFactory() )); // works as before
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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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