Ichthyostega
806db414dd
* Lumiera source code always was copyrighted by individual contributors * there is no entity "Lumiera.org" which holds any copyrights * Lumiera source code is provided under the GPL Version 2+ == Explanations == Lumiera as a whole is distributed under Copyleft, GNU General Public License Version 2 or above. For this to become legally effective, the ''File COPYING in the root directory is sufficient.'' The licensing header in each file is not strictly necessary, yet considered good practice; attaching a licence notice increases the likeliness that this information is retained in case someone extracts individual code files. However, it is not by the presence of some text, that legally binding licensing terms become effective; rather the fact matters that a given piece of code was provably copyrighted and published under a license. Even reformatting the code, renaming some variables or deleting parts of the code will not alter this legal situation, but rather creates a derivative work, which is likewise covered by the GPL! The most relevant information in the file header is the notice regarding the time of the first individual copyright claim. By virtue of this initial copyright, the first author is entitled to choose the terms of licensing. All further modifications are permitted and covered by the License. The specific wording or format of the copyright header is not legally relevant, as long as the intention to publish under the GPL remains clear. The extended wording was based on a recommendation by the FSF. It can be shortened, because the full terms of the license are provided alongside the distribution, in the file COPYING.
132 lines
4 KiB
C++
132 lines
4 KiB
C++
/*
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MementoTie(Test) - check the mechanism for capturing and providing undo-state
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Copyright (C)
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2009, Hermann Vosseler <Ichthyostega@web.de>
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**Lumiera** is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version. See the file COPYING for further details.
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* *****************************************************************/
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/** @file memento-tie-test.cpp
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** unit test \ref MementoTie_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 "steam/control/memento-tie.hpp"
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#include <functional>
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using std::function;
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using std::bind;
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namespace steam {
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namespace control {
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namespace test {
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namespace {
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int testVal=0; ///< used to verify the effect of testFunc
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void
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undo (short param, int memento) ///< simulates "Undo" of the command operation
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{
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testVal += param-memento;
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}
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int
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capture (short param) ///< simulates capturing the undo state
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{
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return testVal+param;
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}
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/** maximum additional storage maybe wasted due
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* to alignment of the memento value within MementoTie
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*/
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const size_t ALIGNMENT = sizeof(size_t);
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}
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using LERR_(MISSING_MEMENTO);
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/*************************************************************************************//**
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* @test Verify the state capturing mechanism (memento), which is used to implement
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* the Undo() functionality for Steam-Layer commands. Bind an undo function and a state
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* capturing function and wire up both to store and retrieve a memento value.
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* Verify that after closing the functions, actually state is captured by each invocation.
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*
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* @see control::Command
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* @see control::CmdClosure
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* @see control::UndoMutation
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* @see command-mutation-test.hpp
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*/
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class MementoTie_test : public Test
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{
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virtual void
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run (Arg)
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{
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seedRand();
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checkStateCapturingMechanism();
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}
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/// assumed signature of the Command "Operation"
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typedef void OpSIG(short);
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typedef MementoTie<OpSIG,int> MemHolder;
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void
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checkStateCapturingMechanism ()
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{
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function<void(short,int)> undo_func = undo;
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function< int(short)> cap_func = capture;
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MemHolder mementoHolder (undo_func,cap_func);
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CHECK (sizeof(MemHolder) <= sizeof(int) // storage for the memento
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+ 2 * sizeof(function<void()>) // storage for the 2 undecorated functors
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+ ALIGNMENT);
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function<OpSIG> bound_undo_func = mementoHolder.tieUndoFunc();
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function<OpSIG> bound_cap_func = mementoHolder.tieCaptureFunc();
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VERIFY_ERROR (MISSING_MEMENTO, bound_undo_func(123) );
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VERIFY_ERROR (MISSING_MEMENTO, mementoHolder.getState() );
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short rr (rani (100));
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testVal = 0;
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bound_cap_func(rr); // invoke state capturing
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CHECK (rr == mementoHolder.getState());
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testVal = 10; // meanwhile "somehow" mutate the state
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bound_undo_func(0); // invoking the undo() feeds back the memento
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CHECK (testVal == 10-rr);
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// this cycle can be repeated with different state values
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rr = rani (100);
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testVal = rr;
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bound_cap_func(5); // capture new state
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CHECK (5+rr == mementoHolder.getState());
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testVal = -20;
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bound_undo_func(3*rr);
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CHECK (testVal == -20 + 3*rr - (5+rr));
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}
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};
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/** Register this test class... */
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LAUNCHER (MementoTie_test, "unit controller");
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}}} // namespace steam::control::test
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