Represents a pointer to a function, method or a function object. This type should be allocated on stack and passed to functions by value or by reference. Never use System::SmartPtr class to manage objects of this type. More...

Inherits System::Details::DelegateHoldingVariables.

Public Member Functions
	Delegate ()=default
	Default constructor. Constructs the delegate object that does not point to anything. More...

	Delegate (const Delegate &)=delete

Delegate &	operator= (const Delegate &)=delete

	Delegate (Delegate &&o)
	Moving copy constructor. Takes the ownership of an entity pointed to by the specified delegate. More...

Delegate &	operator= (Delegate &&o)
	Moving assignment operator. Takes the ownership of an entity pointed to by the specified delegate. More...

template<class T >
	Delegate (T function, typename std::enable_if<!std::is_bind_expression< T >::value &&std::is_pointer< T >::value &&std::is_function< typename std::remove_pointer< T >::type >::value >::type *=0)
	Constructor. Constructs a delegate object from the specified pointer to free function or static method. More...

template<class T >
	Delegate (T function, typename std::enable_if< std::is_bind_expression< T >::value >::type *=0)
	Constructor. Constructs a delegate from the specified pointer to the function object generated by std::bind(). More...

template<class T >
	Delegate (int functor_tag, T &functor)
	Constructor. Constructs a delegate from the specified function object. More...

template<class T >
	Delegate (long functor_tag, T &&functor)
	Moving constructor. Constructs a delegate from the specified function object. More...

template<class MemberType , class ClassType >
	Delegate (MemberType ClassType::member, ClassType obj)
	Constructor. Constructs a delegate that points to the specified non-static method of the specified object. More...

template<class MemberType , class ClassType >
	Delegate (MemberType ClassType::*member, const SharedPtr< ClassType > &obj)
	Constructor. Constructs a delegate that points to the specified non-static method of the specified object. More...

template<class R , class... Args>
	Delegate (std::function< R(Args...)> f)
	Constructs a delegate object that points to an std::function function object. More...

ReturnType	operator() (ArgumentTypes... args)
	Invokes a function, method or a function object that is pointed to by current delegate object. More...

bool	operator== (const Delegate &f) const
	Compares two delegate objects to check if they point to the same entity. More...

bool	Empty ()
	Determines if the current delegate object is empty, e.g. does not point to any entity. More...

Detailed Description

template<class ReturnType, class... ArgumentTypes>
class System::Delegate< ReturnType(ArgumentTypes...)>

Represents a pointer to a function, method or a function object. This type should be allocated on stack and passed to functions by value or by reference. Never use System::SmartPtr class to manage objects of this type.

#include "system/delegate.h"
#include <iostream>
 
// Declare the delegate.
using Message = System::Delegate<void()>;
 
void PrintMessage() {
  std::cout << "Hello, world!" << std::endl;
}
 
int main() {
  // Assign to variable the address of the PrintMessage function.
  Message mes = Message(&PrintMessage);
 
  // Call the function.
  mes();
 
  return 0;
}
/*
This code example produces the following output:
Hello, world!
*/

Template Parameters

ReturnType	The return type of a function, method or a function object pointer to which is represented by the class
ArgumentTypes	The argument list of a function, method or a function object pointer to which is represented by the class

Constructor & Destructor Documentation

◆ Delegate() [1/10]

template<class ReturnType , class... ArgumentTypes>

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate ( )

default

Default constructor. Constructs the delegate object that does not point to anything.

◆ Delegate() [2/10]

template<class ReturnType , class... ArgumentTypes>

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate ( const Delegate< ReturnType(ArgumentTypes...)> & )

delete

◆ Delegate() [3/10]

template<class ReturnType , class... ArgumentTypes>

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate ( Delegate< ReturnType(ArgumentTypes...)> && o )

inline

Moving copy constructor. Takes the ownership of an entity pointed to by the specified delegate.

Parameters

o	The Delegate object to move the pointed to entity from

◆ Delegate() [4/10]

template<class ReturnType , class... ArgumentTypes>

template<class T >

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate	(	T	function,
		typename std::enable_if<!std::is_bind_expression< T >::value &&std::is_pointer< T >::value &&std::is_function< typename std::remove_pointer< T >::type >::value >::type *	= `0`
	)

inline

Constructor. Constructs a delegate object from the specified pointer to free function or static method.

Parameters

function Pointer to a function or a static method that will be pointed to by the newly created Delegate instance

Template Parameters

The	type of the function or static method pointer accepted by the constructor as an argument

◆ Delegate() [5/10]

template<class ReturnType , class... ArgumentTypes>

template<class T >

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate	(	T	function,
		typename std::enable_if< std::is_bind_expression< T >::value >::type *	= `0`
	)

inline

Constructor. Constructs a delegate from the specified pointer to the function object generated by std::bind().

Parameters

function Pointer to a "bind expression" - a function pointer generated by std::bind() - that will be pointed to by the newly created Delegate instance

Template Parameters

The	type of the function object generated by std::bind() accepted by the constructor as an argument

◆ Delegate() [6/10]

template<class ReturnType , class... ArgumentTypes>

template<class T >

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate	(	int	functor_tag,
		T &	functor
	)

inline

Constructor. Constructs a delegate from the specified function object.

Parameters

functor_tag	A dummy integer value; this argument is used to resolve ambiguity
functor	A function object that the newly constructed delegate will point to

Template Parameters

T	The type of the function object accepted by the constructor as an argument

◆ Delegate() [7/10]

template<class ReturnType , class... ArgumentTypes>

template<class T >

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate	(	long	functor_tag,
		T &&	functor
	)

inline

Moving constructor. Constructs a delegate from the specified function object.

Parameters

functor_tag	A dummy integer value; this argument is used to resolve ambiguity
functor	A function object that the newly constructed delegate will point to

Template Parameters

T	The type of the function object accepted by the constructor as an argument

◆ Delegate() [8/10]

template<class ReturnType , class... ArgumentTypes>

template<class MemberType , class ClassType >

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate	(	MemberType ClassType::*	member,
		ClassType *	obj
	)

inline

Constructor. Constructs a delegate that points to the specified non-static method of the specified object.

Parameters

member	A pointer to the non-static method that the newly created delegate will point to
obj	A pointer to an object member method of which will be pointed to by the newly created delegate

Template Parameters

MemberType	The type of the non-static method that the constructor accepts as an argument
ClassType	The type of the object accepted by the constructor as an argument

◆ Delegate() [9/10]

template<class ReturnType , class... ArgumentTypes>

template<class MemberType , class ClassType >

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate	(	MemberType ClassType::*	member,
		const SharedPtr< ClassType > &	obj
	)

inline

Constructor. Constructs a delegate that points to the specified non-static method of the specified object.

Parameters

member	A pointer to the non-static method that the newly created delegate will point to
obj	A shard pointer to an object member method of which will be pointed to by the newly created delegate

Template Parameters

MemberType	The type of the non-static method that the constructor accepts as an argument
ClassType	The type of the object accepted by the constructor as an argument

◆ Delegate() [10/10]

template<class ReturnType , class... ArgumentTypes>

template<class R , class... Args>

System::Delegate< ReturnType(ArgumentTypes...)>::Delegate ( std::function< R(Args...)> f )

inline

Constructs a delegate object that points to an std::function function object.

Parameters

f	A function object to be pointed to by the newly created delegate object

Template Parameters

R	The return type of the function object accepted by the constructor as an argument
Args	The argument list of the function object accepted by the constructor as an argument

Member Function Documentation

◆ Empty()

template<class ReturnType , class... ArgumentTypes>

bool System::Delegate< ReturnType(ArgumentTypes...)>::Empty ( )

inline

Determines if the current delegate object is empty, e.g. does not point to any entity.

Returns: True if current delegate object does not point to a function, a method of a function object, otherwise - false.

◆ operator()()

template<class ReturnType , class... ArgumentTypes>

ReturnType System::Delegate< ReturnType(ArgumentTypes...)>::operator() ( ArgumentTypes... args )

inline

Invokes a function, method or a function object that is pointed to by current delegate object.

Parameters

args	Arguments to pass to the invoked entity

Returns: The value returned by invoked entity

◆ operator=() [1/2]

template<class ReturnType , class... ArgumentTypes>

Delegate& System::Delegate< ReturnType(ArgumentTypes...)>::operator= ( const Delegate< ReturnType(ArgumentTypes...)> & )

delete

◆ operator=() [2/2]

template<class ReturnType , class... ArgumentTypes>

Delegate& System::Delegate< ReturnType(ArgumentTypes...)>::operator= ( Delegate< ReturnType(ArgumentTypes...)> && o )

inline

Moving assignment operator. Takes the ownership of an entity pointed to by the specified delegate.

Parameters

o	The Delegate object to move the pointed to entity from

Returns: A reference to the self

◆ operator==()

template<class ReturnType , class... ArgumentTypes>

bool System::Delegate< ReturnType(ArgumentTypes...)>::operator== ( const Delegate< ReturnType(ArgumentTypes...)> & f ) const

inline

Compares two delegate objects to check if they point to the same entity.

Parameters

f	A delegate object to compare current delegate object with

Returns: True if both delegates point the same entity, otherwise - false

Public Member Functions

Detailed Description

template<class ReturnType, class... ArgumentTypes> class System::Delegate< ReturnType(ArgumentTypes...)>

Constructor & Destructor Documentation

◆ Delegate() [1/10]

◆ Delegate() [2/10]

◆ Delegate() [3/10]

◆ Delegate() [4/10]

◆ Delegate() [5/10]

◆ Delegate() [6/10]

◆ Delegate() [7/10]

◆ Delegate() [8/10]

◆ Delegate() [9/10]

◆ Delegate() [10/10]

Member Function Documentation

◆ Empty()

◆ operator()()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ operator==()

template<class ReturnType, class... ArgumentTypes>
class System::Delegate< ReturnType(ArgumentTypes...)>