System::Func< Args > Class Template Reference

Function delegate. 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...

#include <func.h>

Inherits System::MulticastDelegate<::System::Detail::FuncArgsReorderer< void(), Args... >::type >.

Public Member Functions
	Func ()
	Default constructor that creates null-Func. More...
template<typename T >
	Func (T &&arg)
	Constructor that constructs Func object and assigns value (either actual callback or nullptr) to it. More...
	Func (const Func &func)
	Copy constructor. More...
	Func (Func &&func) noexcept
	Move constructor. More...
	~Func ()
	Destructor. More...
Func &	operator= (const Func &other)
	Copy assignment. More...
Func &	operator= (Func &&other) noexcept
	Move assignment. More...

Detailed Description

template<typename... Args>
class System::Func< Args >

Function delegate. 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/func.h"
#include <iostream>
 
// This function accepts an instance of the System::Func delegate as a parameter.
void Print(int x, const System::Func<int, int> &func)
{
  std::cout << func(x) << std::endl;
}
 
int main()
{
  // Create an instance of the System::Func delegate.
  auto func = static_cast<System::Func<int, int>>([](int x) -> int
  {
    return x * x;
  });
 
  // Pass the created instance as a function argument.
  Print(1, func);
  Print(2, func);
  Print(3, func);
 
  return 0;
}
/*
This code example produces the following output:
1
4
9
*/

Template Parameters

Args	Call arguments, then mandatory return type.

Constructor & Destructor Documentation

Func() [1/4]

template<typename... Args>

System::Func< Args >::Func ( )

inline

Default constructor that creates null-Func.

Func() [2/4]

template<typename... Args>

template<typename T >

System::Func< Args >::Func ( T &&  arg )

inline

Constructor that constructs Func object and assigns value (either actual callback or nullptr) to it.

Template Parameters

T	Argument type.

Parameters

arg

Argument.

Func() [3/4]

template<typename... Args>

System::Func< Args >::Func ( const Func< Args > &  func )

inline

Copy constructor.

Parameters

func	Object to copy data from.

Func() [4/4]

template<typename... Args>

System::Func< Args >::Func ( Func< Args > &&  func )

inlinenoexcept

Move constructor.

Parameters

func	Object to move data from.

~Func()

template<typename... Args>

System::Func< Args >::~Func ( )

inline

Destructor.

Member Function Documentation

operator=() [1/2]

template<typename... Args>

Func & System::Func< Args >::operator= ( const Func< Args > &  other )

inline

Copy assignment.

Parameters

other

Func delegate to copy to current object.

Returns

Reference to this.

operator=() [2/2]

template<typename... Args>

Func & System::Func< Args >::operator= ( Func< Args > &&  other )

inlinenoexcept

Move assignment.

Parameters

other

Func delegate to move to current object. The state can be changed.

Returns

Reference to this.