Attributes

Attributes are similar to properties but are dynamic, i.e., they are not specified by the class and can change type. Like properties, values are restricted to the types in navground::core::Attribute. Classes with attributes save/load their attributes from YAML.

#include "navground/core/attribute.h"

using navground::core::Attribute = Property::Field

using navground::core::Attributes = std::map<std::string, Attribute>

A type the holds a dictionary of named attributes name -> value

struct HasAttributes

This class defines set and get methods to access dynamic attributes.

Subclassed by navground::sim::Agent, navground::sim::World

Public Functions

inline const Attributes &get_attributes() const

Gets all attributes.

Returns:

The attributes.

inline void set_attributes(const Attributes &values)

Sets all attributes.

Parameters:

values – [in] The attributes.

inline void set(const std::string &name, const Property::Field &value)

Set the value of a named attribute.

Parameters:

• name – [in] The name of the property

• value – [in] The desired value for the attribute

inline std::optional<Attribute> get(const std::string &name) const

Gets the value of the specified attribute.

Parameters:

name – [in] The name of the attribute

Returns:

The value of the attribute

inline std::optional<Attribute> has(const std::string &name) const

Checks if the specified attribute is set.

Parameters:

name – [in] The name of the attribute

Returns:

True if the attribute is present.

inline void remove(const std::string &name)

Remove the specified attribute.

Parameters:

name – [in] The name of the attribute

inline void clear()

Remove all attributes.

template<typename T>
inline std::optional<T> get_typed(const std::string &name) const

Gets the value of the specified attribute.

Parameters:

name – [in] The name

Template Parameters:

T – The desired type

Returns:

The value static casted to T if possible, else null.