rttr::type Class Reference

This class holds the type information for any arbitrary object. More...

#include <type.h>

Public Types
typedef uint16	type_id

Public Member Functions
	type (const type &other)
	Assigns a type to another one. More...
variant	create (std::vector< detail::argument > args) const
	Creates an instance of the given type, with the given arguments for the constructor. More...
void	destroy (variant &obj) const
	Destroys the given object obj. More...
std::vector< type >	get_base_classes () const
	Returns a list of all base classes of this type. More...
constructor	get_constructor (const std::vector< type > &params=std::vector< type >()) const
	Returns a public constructor whose parameters match the types in the specified list. More...
std::vector< constructor >	get_constructors () const
	Returns a list of all registered constructors for this type; the order is unspecified. More...
std::vector< type >	get_derived_classes () const
	Returns a list of all derived classes of this type. More...
destructor	get_destructor () const
	Returns the corresponding destructor for this type. More...
enumeration	get_enumeration () const
	Returns the enumerator if this type is an enum type; otherwise the returned value is not valid. More...
type_id	get_id () const
	Returns the id of this type. More...
method	get_method (const std::string &name) const
	Returns a method with the name name. More...
method	get_method (const std::string &name, const std::vector< type > &params) const
	Returns a method with the name name which match the given parameter list params. More...
std::vector< method >	get_methods () const
	Returns a list of all registered methods for this type and all its base classes. More...
std::string	get_name () const
	Returns the unique and human-readable name of the type. More...
std::vector< property >	get_properties () const
	Returns a list of all registered properties for this type and all its base classes. More...
property	get_property (const std::string &name) const
	Returns a property with the name name. More...
variant	get_property_value (const std::string &name, detail::instance obj) const
	Returns the property value of property named name from the instance obj. More...
type	get_raw_type () const
	Returns a type object which represent the raw type. More...
variant	invoke (const std::string &name, detail::instance obj, std::vector< detail::argument > args) const
	Invokes the method represented by the current instance object. More...
bool	is_array () const
	Returns true whether the given type represents an array. More...
bool	is_class () const
	Returns true whether the given type is class; that is not an atomic type or a method. More...
bool	is_derived_from (const type &other) const
	Returns true if this type is derived from the given type other, otherwise false. More...
template<typename T >
bool	is_derived_from () const
	Returns true if this type is derived from the given type T, otherwise false. More...
bool	is_enumeration () const
	Returns true whether the given type represents an enumeration. More...
bool	is_pointer () const
	Returns true whether the given type represents a pointer. More...
bool	is_primitive () const
	Returns true whether the given type represents an primitive type (e.g. More...
bool	is_valid () const
	Returns true if this type is valid, that means the type holds valid data to a type. More...
	operator bool () const
	Convenience function to check if this type is valid or not. More...
bool	operator!= (const type &other) const
	Compares this type with the other type and returns true if both describe different types, otherwise returns false. More...
bool	operator< (const type &other) const
	Comparison operator for sorting the type data according to some internal criterion. More...
bool	operator<= (const type &other) const
	Comparison operator for sorting the type data according to some internal criterion. More...
type &	operator= (const type &other)
	Assigns a type to another one. More...
bool	operator== (const type &other) const
	Compares this type with the other type and returns true if both describe the same type, otherwise returns false. More...
bool	operator> (const type &other) const
	Comparison operator for sorting the type data according to some internal criterion. More...
bool	operator>= (const type &other) const
	Comparison operator for sorting the type data according to some internal criterion. More...
bool	set_property_value (const std::string &name, detail::instance obj, detail::argument arg) const
	This function will set the given value arg to a property named name to the instance obj. More...

Static Public Member Functions
template<typename T >
static type	get ()
	Returns a type object for the given template type T. More...
template<typename T >
static type	get (T &&object)
	Returns a type object for the given instance object. More...
static type	get (const char *name)
	Returns the type object for the given name. More...
static method	get_global_method (const std::string &name)
	Returns a global method with the name name. More...
static method	get_global_method (const std::string &name, const std::vector< type > &params)
	Returns a global method with the name name which match the given parameter list params. More...
static std::vector< method >	get_global_methods ()
	Returns a list of all registered global methods. More...
static std::vector< property >	get_global_properties ()
	Returns a list of all registered global properties. More...
static property	get_global_property (const std::string &name)
	Returns a global property with the name name. More...
static variant	get_property_value (const std::string &name)
	Returns the property value of property named name. More...
static std::vector< type >	get_types ()
	Returns a list of all registered type objects. More...
static variant	invoke (const std::string &name, std::vector< detail::argument > args)
	Invokes a global method named name with the specified argument args. More...
template<typename F >
static void	register_converter_func (F func)
	Register a converter func F. More...
static bool	set_property_value (const std::string &name, detail::argument arg)
	This function will set the given value arg to a property named name. More...

Friends
template<typename TargetType , typename SourceType >
TargetType	rttr_cast (SourceType object)
	Casts the given object of type SourceType to an object of type TargetType. More...

Detailed Description

This class holds the type information for any arbitrary object.

Every class or primitive data type can have an unique type object. With the help of this object you can compare unknown types for equality at runtime or introspect the type for its properties, methods, enumerations, constructors and destructor.

Preparation

Before you can retrieve data from type, you have to register your struct or class. Therefore use the macro RTTR_DECLARE_TYPE(Type) to make the type known to the type system.

This example shows a typical usage:

// MyStruct.h
struct MyStruct
{
  int i;
};

RTTR_DECLARE_TYPE(MyStruct)

Retrieve type

A type object cannot be created. It is only possible to retrieve a type object via three static template member functions:

type::get(const char*)

This function just expects the name of the type. This is useful when you know only the name of the type and cannot include the type itself into the source code. The name of the type is the same like you have registered with RTTR_DECLARE_TYPE but as string literal. When you have used a typedef then you need to provide this typedef also as string literal.

type::get("int") == type::get("int");   // yields to true
type::get("bool") == type::get("int");  // yields to false
type::get("MyNameSpace::MyStruct") == type::get("MyNameSpace::MyStruct");  // yields to true

type::get<T>()

This function just expects one template argument. Use it to check against a known type.

type::get<int>() == type::get<int>();  // yields to true
type::get<int>() == type::get<bool>(); // yields to false

type::get<T>(T&& obj)

This function is a universal reference and returns from every given object the corresponding type object.

int int_obj;
int* int_obj_ptr = &int_obj;
const int* c_int_obj_ptr = int_obj_ptr;
type::get<int>() == type::get(int_obj);             // yields to true
type::get<int*>() == type::get(int_obj_ptr);        // yields to true
type::get<const int*>() == type::get(c_int_obj_ptr);// yields to true

When this function is called for a glvalue expression whose type is a polymorphic class type, then the result refers to a type object representing the type of the most derived object.

struct Base {};
struct Derived : Base {};
Derived d;
Base& base = d;
type::get<Derived>() == type::get(base) // yields to true
type::get<Base>() == type::get(base)    // yields to false

// remark, when called with pointers:
Base* base_ptr = &d;
type::get<Derived>() == type::get(base_ptr);  // yields to false
type::get<Base*>() == type::get(base_ptr);    // yields to true

Remarks

If the type of the expression is a cv-qualified type, the result of the rttr::type::get expression refers to a rttr::type object representing the cv-unqualified type.

class D { ... };
D d1;
const D d2;
type::get(d1)  == type::get(d2);         // yields true
type::get<D>() == type::get<const D>();  // yields true
type::get<D>() == type::get(d2);         // yields true
type::get<D>() == type::get<const D&>(); // yields true
type::get<D>() == type::get<const D*>(); // yields false

Any top level cv-qualifier of the given type T will be removed.

Copying and Assignment

A type object is lightweight and can be copied by value. However, each copy will refer to the same underlying type.

Member Typedef Documentation

typedef uint16 rttr::type::type_id

Constructor & Destructor Documentation

rttr::type::type

(

const type &

other

)

Assigns a type to another one.

Member Function Documentation

variant rttr::type::create

(

std::vector< detail::argument >

args

)

const

Creates an instance of the given type, with the given arguments for the constructor.

Remarks

When the arguments does not match the parameter list of the constructor then he will not be invoked.

Returns

Returns an instance of the given type.

void rttr::type::destroy

(

variant &

obj

)

const

Destroys the given object obj.

Remarks

When the obj could be destroyed the given obj is invalid after calling this method; Otherwise it is still valid.

template<typename T >

static type rttr::type::get ( )

static

Returns a type object for the given template type T.

Returns

type for the template type T.

template<typename T >

static type rttr::type::get ( T &&  object )

static

Returns a type object for the given instance object.

Remarks

If the type of the expression is a cv-qualified type, the result of the type::get() expression refers to a type object representing the cv-unqualified type. When type::get() is applied to a glvalue expression whose type is a polymorphic class type, the result refers to a type object representing the type of the most derived object.

Returns

type for an object of type T.

static type rttr::type::get ( const char *  name )

static

Returns the type object for the given name.

Remarks

The search for the type is case sensitive. The name itself correspond to the name registered with RTTR_DECLARE_TYPE.

Returns

type for an object of name name.

std::vector<type> rttr::type::get_base_classes

(

)

const

Returns a list of all base classes of this type.

Returns

A list of type objects.

constructor rttr::type::get_constructor

(

const std::vector< type > &

params = std::vector< type >()

)

const

Returns a public constructor whose parameters match the types in the specified list.

Remarks

When no parameter list is given, it will be searched for the default constructor.

Returns

A valid constructor will be returned when the parameter matches the registered constructor; otherwise an invalid constructor.

std::vector<constructor> rttr::type::get_constructors

(

)

const

Returns a list of all registered constructors for this type; the order is unspecified.

Returns

Returns a list of all registered constructors.

std::vector<type> rttr::type::get_derived_classes

(

)

const

Returns a list of all derived classes of this type.

Returns

A list of type objects.

destructor rttr::type::get_destructor

(

)

const

Returns the corresponding destructor for this type.

Remarks

When there is no constructor registered for this type, then also the destructor is not available. A destructor will always been automatically registered.

Returns

Returns the destructor for this type.

enumeration rttr::type::get_enumeration

(

)

const

Returns the enumerator if this type is an enum type; otherwise the returned value is not valid.

See also

is_enumeration()

Returns

A enumeration object.

static method rttr::type::get_global_method ( const std::string &  name )

static

Returns a global method with the name name.

Remarks

When there exists not method with the name name, and invalid method is returned.

Returns

A method with name name.

static method rttr::type::get_global_method ( const std::string &  name, const std::vector< type > &  params  )

static

Returns a global method with the name name which match the given parameter list params.

Remarks

When there exists not method with the name name and matching parameter list params, then an invalid method is returned.

Returns

A method with name name and parameter signature params.

static std::vector<method> rttr::type::get_global_methods ( )

static

Returns a list of all registered global methods.

Returns

A vector with methods.

static std::vector<property> rttr::type::get_global_properties ( )

static

Returns a list of all registered global properties.

Returns

A vector with properties.

static property rttr::type::get_global_property ( const std::string &  name )

static

Returns a global property with the name name.

Remarks

When there exists not property with the name name, and invalid property is returned.

Returns

A property with name name.

type_id rttr::type::get_id

(

)

const

Returns the id of this type.

Note

This id is unique at process runtime, but the id can be changed every time the process is executed.

Returns

The type id.

method rttr::type::get_method

(

const std::string &

name

)

const

Returns a method with the name name.

Remarks

When there exists not method with the name name, then an invalid method is returned.

Returns

A method with name name.

method rttr::type::get_method	(	const std::string &	name,
		const std::vector< type > &	params
	)		const

Returns a method with the name name which match the given parameter list params.

Remarks

When there exists not method with the name name and matching parameter list params, then an invalid method is returned.

Returns

A method with name name.

std::vector<method> rttr::type::get_methods

(

)

const

Returns a list of all registered methods for this type and all its base classes.

Returns

A vector with method objects

std::string rttr::type::get_name

(

)

const

Returns the unique and human-readable name of the type.

Returns

The type name.

std::vector<property> rttr::type::get_properties

(

)

const

Returns a list of all registered properties for this type and all its base classes.

Returns

A vector with properties.

property rttr::type::get_property

(

const std::string &

name

)

const

Returns a property with the name name.

Remarks

When there exists not property with the name name, and invalid property is returned.

Returns

A property with name name.

variant rttr::type::get_property_value	(	const std::string &	name,
		detail::instance	obj
	)		const

Returns the property value of property named name from the instance obj.

Remarks

When the given instance is empty, the value of global property will be tryed to returned.

Returns

A variant containing the value of the property.

static variant rttr::type::get_property_value ( const std::string &  name )

static

Returns the property value of property named name.

Returns

A variant containing the value of the property.

type rttr::type::get_raw_type

(

)

const

Returns a type object which represent the raw type.

A raw type, is a type type without any qualifiers (const and volatile) nor any pointer.

Remarks

When the current type is already the raw type, it will return an copy from itself.

Returns

The corresponding raw type object.

static std::vector<type> rttr::type::get_types ( )

static

Returns a list of all registered type objects.

Remarks

The order of the type object is unspecified.

Returns

A vector of type objects.

variant rttr::type::invoke	(	const std::string &	name,
		detail::instance	obj,
		std::vector< detail::argument >	args
	)		const

Invokes the method represented by the current instance object.

Remarks

When it's a static method you still need to provide an instance object, use therefore the function empty_instance().

Returns

The a variant object containing the possible return value, otherwise when it is a void function an empty but valid variant object.

static variant rttr::type::invoke ( const std::string &  name, std::vector< detail::argument >  args  )

static

Invokes a global method named name with the specified argument args.

Returns

The a variant object containing the possible return value, otherwise when it is a void function an empty but valid variant object.

bool rttr::type::is_array

(

)

const

Returns true whether the given type represents an array.

Returns

True if the type is an array, otherwise false.

bool rttr::type::is_class

(

)

const

Returns true whether the given type is class; that is not an atomic type or a method.

Returns

True if the type is a class, otherwise false.

bool rttr::type::is_derived_from

(

const type &

other

)

const

Returns true if this type is derived from the given type other, otherwise false.

Returns

Returns true if this type is a derived type from other, otherwise false.

template<typename T >

bool rttr::type::is_derived_from

(

)

const

Returns true if this type is derived from the given type T, otherwise false.

Returns

Returns true if this type is a derived type from T, otherwise false.

bool rttr::type::is_enumeration

(

)

const

Returns true whether the given type represents an enumeration.

Returns

True if the type is an enumeration, otherwise false.

bool rttr::type::is_pointer

(

)

const

Returns true whether the given type represents a pointer.

Returns

True if the type is a pointer, otherwise false.

bool rttr::type::is_primitive

(

)

const

Returns true whether the given type represents an primitive type (e.g.

int, bool, etc.).

Returns

True if the type is a primitive type, otherwise false.

bool rttr::type::is_valid

(

)

const

Returns true if this type is valid, that means the type holds valid data to a type.

Returns

True if this type is valid, otherwise false.

rttr::type::operator bool

(

)

const

Convenience function to check if this type is valid or not.

Returns

True if this type is valid, otherwise false.

bool rttr::type::operator!=

(

const type &

other

)

const

Compares this type with the other type and returns true if both describe different types, otherwise returns false.

Returns

True if both type are not equal, otherwise false.

bool rttr::type::operator<

(

const type &

other

)

const

Comparison operator for sorting the type data according to some internal criterion.

Returns

True if this type is less than the other.

bool rttr::type::operator<=

(

const type &

other

)

const

Comparison operator for sorting the type data according to some internal criterion.

Returns

True if this type is less than or equal to other.

type& rttr::type::operator=

(

const type &

other

)

Assigns a type to another one.

Returns

A type object.

bool rttr::type::operator==

(

const type &

other

)

const

Compares this type with the other type and returns true if both describe the same type, otherwise returns false.

Returns

True if both type are equal, otherwise false.

bool rttr::type::operator>

(

const type &

other

)

const

Comparison operator for sorting the type data according to some internal criterion.

Returns

True if this type is greater than the other.

bool rttr::type::operator>=

(

const type &

other

)

const

Comparison operator for sorting the type data according to some internal criterion.

Returns

True if this type is greater than or equal to other.

template<typename F >

static void rttr::type::register_converter_func ( F  func )

static

Register a converter func F.

This function converts a source Type to a target type. The signature of this function has to be the following: <TargetType (SourceType, bool& ok)> e.g.:

std::string conv_func(int value, bool& ok)
{
   std::string result = std::to_string(value);
   ok = true;
   return result;
}
//...
type::register_converter_func(conv_func);

bool rttr::type::set_property_value	(	const std::string &	name,
		detail::instance	obj,
		detail::argument	arg
	)		const

This function will set the given value arg to a property named name to the instance obj.

Remarks

When the given instance is empty, the value of a global property with name name will be tryed to set.

Returns

A bool value, which is true, when the value could be set, otherwise false.

static bool rttr::type::set_property_value ( const std::string &  name, detail::argument  arg  )

static

This function will set the given value arg to a property named name.

Returns

A bool value, which is true, when the value could be set, otherwise false.

Friends And Related Function Documentation

template<typename TargetType , typename SourceType >

TargetType rttr_cast ( SourceType  object )

friend

Casts the given object of type SourceType to an object of type TargetType.

When the given the given object is an instance of type TargetType, then this function will cast the pointer to the TargetType; otherwise it will return a nullptr. If object is already a nullptr then it will also return a nullptr.

Remarks

SourceType and TargetType must be both pointer types.

Returns

A pointer of type TargetType

---

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

• type.h