Parameter< T > Class Template Reference

#include <ImFusion/Core/Parameter.h>

The Parameter class represents a single parameter of a Configurable entity. More...

Inheritance diagram for Parameter< T >:

Detailed Description

template<typename T>
class ImFusion::Parameter< T >

The Parameter class represents a single parameter of a Configurable entity.

It is intended to be used as member of Configurable classes and enables you to reduce the amount of boilerplate code needed to implement the pair of configure()/configuration() functions for each individual class member that is supposed to be serialized. In order for this to work each Parameter must be registered with the parent Configurable instance. This can be automatized by passing it as additional argument to the corresponding constructor overload. Registration is preserved across copies/moves/assignments, and removed on destruction.

Parameters wrap a regular type T and make it serializable to/from the Properties interface. Since it provides a cast- and assignment operator, it can be used like a variable of type T directly:

Parameter<int> count("count", 0);
int other = count;
count = 5;

Any getter access is restricted to const access. To change the parameter you need to explicitly set it. This ensures the signalValueChanged to be emitted whenever the param changes.

By convention, public Parameter members use the p_ prefix for the variable name (instead of the common m_ prefix) in order to make their semantics easier to identify in code.

Template Parameters

T	Underlying type of the parameter, must be supported by Properties::setParam().

See also

SubProperty, SubPropertyList

Examples

ExampleAlgorithm.h, and Serialization.cpp.

Public Member Functions
template<typename U>
	Parameter (const std::string &name, U &&value)
	Creates a Parameter that will be configured under the given name and with the given initial value.
template<typename U>
	Parameter (const std::string &name, U &&value, Configurable *parent)
	Create a Parameter that is directly registered with the parent Configurable instance.
template<typename U>
	Parameter (const std::string &name, U &&value, Configurable &parent)
	Parameter (const Parameter< T > &other)
	Parameter (Parameter< T > &&other)
Parameter< T > &	operator= (const Parameter< T > &other)
	Assigns value, default value, type, and attributes from another Parameter instance of the same type and emits signalValueChanged.
Parameter< T > &	operator= (Parameter< T > &other)
	Assigns value, default value, type, and attributes from another Parameter instance of the same type and emits signalValueChanged.
Parameter< T > &	operator= (Parameter< T > &&other)
	Assigns value, default value, type, and attributes from another Parameter instance of the same type and emits signalValueChanged.
template<typename U>
Parameter< T > &	operator= (U &&value)
	Updates the Parameter's stored value, emits the signalValueChanged if needed.
template<typename U>
void	setValue (U &&value)
	Updates the Parameter's stored value, emits the signalValueChanged if needed.
const T &	value () const
	Returns the currently stored value.
	operator const T & () const
	Returns the currently stored value.
void	setDefault (const T &defaultValue)
	Sets the default value for this parameter.
void	removeDefault ()
	Removes the default value for this parameter.
std::optional< T >	defaultValue () const
	Returns the default value of this parameter if specified.
void	setType (Properties::ParamType type)
	Sets an optional custom ParamType.
template<typename Q = T>
std::enable_if_t< std::is_arithmetic_v< Q > >	setRange (T min, T max)
	Set the min/max parameter attributes of arithmetic parameters.
template<typename Q = T>
std::enable_if_t< std::is_same_v< Q, std::optional< typename Q::value_type > > &&std::is_arithmetic_v< typename Q::value_type > >	setRange (typename Q::value_type min, typename Q::value_type max)
	Set the min/max parameter attributes of optional arithmetic parameters.
void	configure (const Properties *p) override
	Configure this parameter/sub property by de-serializing the given Properties.
void	configuration (Properties *p) const override
	Serialize the current parameter/sub property state into the given Properties object.
Public Member Functions inherited from ParameterBase
	ParameterBase (const std::string &name)
const Configurable *	parent () const
	Return the parent Configurable instance that this parameter is registered with.
virtual const std::string &	name () const
	Returns parameter name, can only be set during construction.
void	setAttribute (const std::string &key, const std::string &value)
	Add the given attribute key-value pair to the set of parameter attributes.
void	removeAttribute (const std::string &key)
	Remove the attribute with the given key.
const std::map< std::string, std::string > &	attributes () const
	Get the attribute map.
void	setLabel (const std::string &label)
	Sets an optional label for the Parameter if displayed in the UI.
void	addDeprecatedName (const std::string &deprecatedName)
	Adds an optional alternative parameter name that should be used for param lookup for during configure() in case de-serialization from m_name was not successful.
const std::vector< std::string > &	deprecatedNames () const
	Returns the list of deprecated parameter names that should be used for param lookup (see addDeprecatedName()).

Protected Attributes
T	m_value
std::optional< T >	m_defaultValue
Properties::ParamType	m_type = Properties::ParamType::Unknown
Protected Attributes inherited from ParameterBase
Configurable *	m_parent = nullptr
const std::string	m_name
std::vector< std::string >	m_deprecatedNames
std::map< std::string, std::string >	m_attributes

Additional Inherited Members
Public Attributes inherited from ParameterBase
Signal	signalValueChanged
	Signal gets emitted when the underlying value of the Parameter/SubProperty has changed (either through setValue() or configure()).
Protected Member Functions inherited from ParameterBase
void	setParentFromCopy (const ParameterBase &other)
	Helper function to be called from a copy/move ctor in order to correctly set the parent relation ship to the new parent Configurable.

Constructor & Destructor Documentation

Parameter() [1/2]

template<typename T>

template<typename U>

Parameter	(	const std::string &	name,
		U &&	value )

Creates a Parameter that will be configured under the given name and with the given initial value.

The initial value will also be used as default value.

Parameter() [2/2]

template<typename T>

template<typename U>

Parameter	(	const std::string &	name,
		U &&	value,
		Configurable *	parent )

Create a Parameter that is directly registered with the parent Configurable instance.

The parent instance is stored and thus must have a lifetime longer than this object.

Member Function Documentation

operator=() [1/3]

template<typename T>

Parameter< T > & operator=

(

const Parameter< T > &

other

)

Assigns value, default value, type, and attributes from another Parameter instance of the same type and emits signalValueChanged.

Expects name and deprecated names to be the same and will not change the parent relationship. Use *this = other.value() if you want to assign only the value from other

operator=() [2/3]

template<typename T>

Parameter< T > & operator=

(

Parameter< T > &

other

)

Assigns value, default value, type, and attributes from another Parameter instance of the same type and emits signalValueChanged.

Expects name and deprecated names to be the same and will not change the parent relationship. Use *this = other.value() if you want to assign only the value from other

Note

This implementation is required as otherwise operator=(U&&) will be picked up as non-const assign operator.

operator=() [3/3]

template<typename T>

Parameter< T > & operator=

(

Parameter< T > &&

other

)

Assigns value, default value, type, and attributes from another Parameter instance of the same type and emits signalValueChanged.

Expects name and deprecated names to be the same and will not change the parent relationship. Use *this = other.value() if you want to assign only the value from other

setType()

template<typename T>

void setType ( Properties::ParamType type )

inline

Sets an optional custom ParamType.

If not set explicitly, it is deduced from T.

See also

Properties::setParamType()

setRange() [1/2]

template<typename T>

template<typename Q = T>

std::enable_if_t< std::is_arithmetic_v< Q > > setRange ( T min, T max )

inline

Set the min/max parameter attributes of arithmetic parameters.

See also

Properties::setParamAttributes()

setRange() [2/2]

template<typename T>

template<typename Q = T>

std::enable_if_t< std::is_same_v< Q, std::optional< typename Q::value_type > > &&std::is_arithmetic_v< typename Q::value_type > > setRange ( typename Q::value_type min, typename Q::value_type max )

inline

Set the min/max parameter attributes of optional arithmetic parameters.

See also

Properties::setParamAttributes()

configure()

template<typename T>

void configure ( const Properties * p )

overridevirtual

Configure this parameter/sub property by de-serializing the given Properties.

Implements ParameterBase.

configuration()

template<typename T>

void configuration ( Properties * p ) const

overridevirtual

Serialize the current parameter/sub property state into the given Properties object.

Implements ParameterBase.

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

• ImFusion/Core/Parameter.h