143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
/*
|
|
MementoTie(Test) - check the mechanism for capturing and providing undo-state
|
|
|
|
Copyright (C) Lumiera.org
|
|
2009, Hermann Vosseler <Ichthyostega@web.de>
|
|
|
|
This program 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.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
* *****************************************************/
|
|
|
|
/** @file memento-tie-test.cpp
|
|
** unit test \ref MementoTie_test
|
|
*/
|
|
|
|
|
|
#include "lib/test/run.hpp"
|
|
#include "lib/test/test-helper.hpp"
|
|
#include "steam/control/memento-tie.hpp"
|
|
|
|
#include <functional>
|
|
#include <cstdlib>
|
|
|
|
using std::function;
|
|
using std::bind;
|
|
using std::rand;
|
|
|
|
|
|
namespace steam {
|
|
namespace control {
|
|
namespace test {
|
|
|
|
|
|
|
|
|
|
namespace {
|
|
|
|
int testVal=0; ///< used to verify the effect of testFunc
|
|
|
|
void
|
|
undo (short param, int memento) ///< simulates "Undo" of the command operation
|
|
{
|
|
testVal += param-memento;
|
|
}
|
|
|
|
int
|
|
capture (short param) ///< simulates capturing the undo state
|
|
{
|
|
return testVal+param;
|
|
}
|
|
|
|
|
|
/** maximum additional storage maybe wasted due
|
|
* to alignment of the memento value within MementoTie
|
|
*/
|
|
const size_t ALIGNMENT = sizeof(size_t);
|
|
}
|
|
|
|
|
|
|
|
/*************************************************************************************//**
|
|
* @test Verify the state capturing mechanism (memento), which is used to implement
|
|
* the Undo() functionality for Steam-Layer commands. Bind an undo function and a state
|
|
* capturing function and wire up both to store and retrieve a memento value.
|
|
* Verify that after closing the functions, actually state is captured by each invocation.
|
|
*
|
|
* @see control::Command
|
|
* @see control::CmdClosure
|
|
* @see control::UndoMutation
|
|
* @see command-mutation-test.hpp
|
|
*/
|
|
class MementoTie_test : public Test
|
|
{
|
|
|
|
virtual void
|
|
run (Arg)
|
|
{
|
|
checkStateCapturingMechanism();
|
|
}
|
|
|
|
|
|
/// assumed signature of the Command "Operation"
|
|
typedef void OpSIG(short);
|
|
typedef MementoTie<OpSIG,int> MemHolder;
|
|
|
|
|
|
void
|
|
checkStateCapturingMechanism ()
|
|
{
|
|
function<void(short,int)> undo_func = undo;
|
|
function< int(short)> cap_func = capture;
|
|
|
|
MemHolder mementoHolder (undo_func,cap_func);
|
|
|
|
CHECK (sizeof(MemHolder) <= sizeof(int) // storage for the memento
|
|
+ 2 * sizeof(function<void()>) // storage for the 2 undecorated functors
|
|
+ ALIGNMENT);
|
|
|
|
function<OpSIG> bound_undo_func = mementoHolder.tieUndoFunc();
|
|
function<OpSIG> bound_cap_func = mementoHolder.tieCaptureFunc();
|
|
|
|
VERIFY_ERROR (MISSING_MEMENTO, bound_undo_func(123) );
|
|
VERIFY_ERROR (MISSING_MEMENTO, mementoHolder.getState() );
|
|
|
|
short rr (rand() %100);
|
|
testVal = 0;
|
|
bound_cap_func(rr); // invoke state capturing
|
|
|
|
CHECK (rr == mementoHolder.getState());
|
|
|
|
testVal = 10; // meanwhile "somehow" mutate the state
|
|
bound_undo_func(0); // invoking the undo() feeds back the memento
|
|
CHECK (testVal == 10-rr);
|
|
|
|
// this cycle can be repeated with different state values
|
|
rr = (rand() %100);
|
|
testVal = rr;
|
|
bound_cap_func(5); // capture new state
|
|
CHECK (5+rr == mementoHolder.getState());
|
|
|
|
testVal = -20;
|
|
bound_undo_func(3*rr);
|
|
CHECK (testVal == -20 + 3*rr - (5+rr));
|
|
}
|
|
};
|
|
|
|
|
|
/** Register this test class... */
|
|
LAUNCHER (MementoTie_test, "unit controller");
|
|
|
|
|
|
}}} // namespace steam::control::test
|