本文整理汇总了C++中Args::canUndo方法的典型用法代码示例。如果您正苦于以下问题：C++ Args::canUndo方法的具体用法？C++ Args::canUndo怎么用？C++ Args::canUndo使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Args的用法示例。
在下文中一共展示了Args::canUndo方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: SIG_do
/** @test simulate a complete command lifecycle with regards to the
* storage handling of the command parameters and state memento.
*/
void
simulateCmdLifecycle()
{
typedef void SIG_do(Tracker<TimeVar>, Tracker<string>, int);
using Args = StorageHolder<SIG_do, Tracker<string>>;
using MemHolder = MementoTie<SIG_do, Tracker<string>>;
Args args;
CHECK (isnil (args));
cout << showSizeof(args) << endl;
// store a set of parameter values, later to be used on invocation
args.storeTuple (
make_tuple (TTime(randTime()), Tstr("Lumiera rocks"), twoRandomDigits() ));
CHECK (!isnil (args));
cout << args << endl;
CHECK (!args.canUndo());
VERIFY_ERROR(MISSING_MEMENTO, args.memento() );
MemHolder& memHolder = args.tie(undoIt,captureState);
CHECK (!memHolder); // no stored memento....
CHECK (!args.canUndo());
function<SIG_do> doItFun = doIt;
function<SIG_do> undoFun = memHolder.tieUndoFunc();
function<SIG_do> captFun = memHolder.tieCaptureFunc();
typedef function<void()> OpFun;
// now close all the functions with the stored parameter values...
OpFun bound_doItFun = std::bind (&CmdClosure::invoke, args, CmdFunctor(doItFun));
OpFun bound_undoFun = std::bind (&CmdClosure::invoke, args, CmdFunctor(undoFun));
OpFun bound_captFun = std::bind (&CmdClosure::invoke, args, CmdFunctor(captFun));
protocol.seekp(0);
protocol << "START...";
bound_captFun();
cout << "captured state: " << args.memento() << endl;
CHECK (memHolder);
CHECK (!isnil (*args.memento()));
CHECK (args.canUndo());
cout << args << endl;
bound_doItFun();
cout << protocol.str() << endl;
bound_undoFun();
cout << protocol.str() << endl;
// Commands can serve as prototype to be copied....
Args argsCopy (args);
bound_captFun();
protocol.seekp(0);
protocol << "RESET...";
args.storeTuple (
make_tuple (TTime(TimeValue(123456)), Tstr("unbelievable"), twoRandomDigits() ));
cout << "modified: " << args << endl;
cout << "copied : " << argsCopy << endl; // holds still the old params & memento
bound_undoFun();
cout << protocol.str() << endl;
}