CommandImpl Class Reference

#include "steam/control/command-impl.hpp"

Description

Steam-Layer Command implementation.

Data record holding together the parts necessary for command execution

• command operation functor
• a functor to UNDO the command effect
• closure holding actual parameters and UNDO state

  Remarks

  the ctor is templated on the concrete type of operation arguments. This information is erased (discarded) immediately after construction. Usually, CommandImpl instances are created within the registry. The implementation type of the closure is StorageHolder<SIG_OPER,Mem>

  See also

  CmdClosure Closure interface

  StorageHolder

  Mutation

Definition at line 77 of file command-impl.hpp.

Public Types
typedef HandlingPattern::ID	PattID

Public Member Functions
template<typename ARG >
	CommandImpl (shared_ptr< ARG > pStorageHolder, _TY(Func_op) const &operFunctor, _TY(Func_cap) const &captFunctor, _TY(Func_undo) const &undoFunctor)
	build a new implementation frame, and do the initial wiring. More...
	CommandImpl (CommandImpl const &orig, UndoMutation const &newUndo, shared_ptr< CmdClosure > const &newClosure)
bool	canExec () const
	< state check: sufficiently defined to be invoked
bool	canUndo () const
	< state check: has undo state been captured?
void	discardArguments ()
PattID	getDefaultHandlingPattern () const
void	invokeCapture ()
void	invokeOperation ()
void	invokeUndo ()
bool	isValid () const
	< validity self-check: is basically usable.
	operator bool () const
	operator string () const
void	prepareClone (CommandImplCloneBuilder &visitor) const
	assist with building a clone copy of this CommandImpl. More...
void	setArguments (Arguments &args)
void	setArguments (lib::diff::Rec const &paramData)
PattID	setHandlingPattern (PattID newID)
	define a handling pattern to be used by default More...

Public Attributes
Symbol	cmdID
	human-readable marker for diagnostics, will be (re)assigned when activating this CommandImpl

Classes
struct	_Type

Private Attributes
HandlingPattern::ID	defaultPatt_
Mutation	do_
shared_ptr< CmdClosure >	pClo_
UndoMutation	undo_

Additional Inherited Members
Private Member Functions inherited from NonCopyable
	NonCopyable (NonCopyable const &)=delete
NonCopyable &	operator= (NonCopyable const &)=delete

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Class Documentation

steam::control::CommandImpl::_Type

struct steam::control::CommandImpl::_Type

Class Members
typedef SIG_op	SIG_op
typedef SIG_cap	SIG_cap
typedef SIG_undo	SIG_undo
typedef function< SIG_op >	Func_op
typedef function< SIG_cap >	Func_cap
typedef function< SIG_undo >	Func_undo

Collaboration diagram for CommandImpl::_Type< ARG >:

Constructor & Destructor Documentation

CommandImpl() [1/2]

CommandImpl ( shared_ptr< ARG >  pStorageHolder, _TY(Func_op) const &  operFunctor, _TY(Func_cap) const &  captFunctor, _TY(Func_undo) const &  undoFunctor  )

inline

build a new implementation frame, and do the initial wiring.

On the interface the specific type is discarded afterwards. This information is still kept though, as encoded into the vtable of the embedded FunErasure objects holding the command operation and undo functors, and the vtable of the embedded CmdClosure

Definition at line 108 of file command-impl.hpp.

CommandImpl() [2/2]

CommandImpl ( CommandImpl const &  orig, UndoMutation const &  newUndo, shared_ptr< CmdClosure > const &  newClosure  )

inline

cloning service for the CommandRegistry: effectively this is a copy ctor, but as we rely on a argument holder (without knowing the exact type), we need to delegate the cloning of the arguments down to where the exact type info is still available; thus, a CommandImplCloneBuilder is first passed as a visitor down and then calls back to perform the copy, providing an new (clone) closure and UNDO functor already correctly wired to collaborate.

See also

prepareClone

Definition at line 135 of file command-impl.hpp.

References CommandImpl::cmdID, and CommandImpl::isValid().

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Member Function Documentation

prepareClone()

void prepareClone ( CommandImplCloneBuilder &  visitor ) const

inline

assist with building a clone copy of this CommandImpl.

By accepting the clone builder as a visitor and dispatching this visitation down into the concrete closure, the builder can re-gain the fully typed context available on creation of the ComandImpl. Within this context, for the clone to be created, the UndoMutation has to be re-wired, otherwise it would continue to cooperate with original closure.

Definition at line 164 of file command-impl.hpp.

Referenced by CommandRegistry::createCloneImpl().

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setHandlingPattern()

PattID setHandlingPattern ( PattID  newID )

inline

define a handling pattern to be used by default

Returns

ID of the currently defined default pattern

Definition at line 208 of file command-impl.hpp.

References steam::mobject::session::test::anonymous_namespace{defs-manager-impl-test.cpp}::newID().

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Inheritance diagram for CommandImpl:

Collaboration diagram for CommandImpl:

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The documentation for this class was generated from the following files:

• command-impl.hpp
• command.cpp