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/* Cydia - iPhone UIKit Front-End for Debian APT
* Copyright (C) 2008-2015 Jay Freeman (saurik)
*/
/* GNU General Public License, Version 3 {{{ */
/*
* Cydia is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 3 of the License,
* or (at your option) any later version.
*
* Cydia is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Cydia. If not, see <http://www.gnu.org/licenses/>.
**/
/* }}} */
#ifndef Menes_Function_H
#define Menes_Function_H
template <typename Result_, typename... Args_>
class Function {
private:
class Abstract {
private:
unsigned references_;
public:
Abstract() :
references_(0)
{
}
Abstract(const Abstract &) = delete;
Abstract &operator =(const Abstract &) = delete;
virtual ~Abstract() {
}
void Retain() {
++references_;
}
void Release() {
if (--references_ == 0)
delete this;
}
virtual Result_ operator()(Args_... args) const = 0;
};
template <typename Callable_>
class Concrete :
public Abstract
{
private:
Callable_ callable_;
public:
Concrete(const Callable_ &callable) :
callable_(callable)
{
}
virtual Result_ operator()(Args_... args) const {
return callable_(args...);
}
};
private:
Abstract *abstract_;
void Release() {
if (abstract_ != NULL)
abstract_->Release();
}
void Copy(Abstract *abstract) {
if (abstract != NULL)
abstract->Retain();
Release();
abstract_ = abstract;
}
template <typename Callable_>
void Assign(const Callable_ &callable) {
Copy(new Concrete<Callable_>(callable));
}
public:
Function() :
abstract_(NULL)
{
}
Function(decltype(nullptr)) :
Function()
{
}
Function(const Function &function) :
abstract_(function.abstract_)
{
abstract_->Retain();
}
template <typename Callable_>
Function(const Callable_ &callable) :
Function()
{
Assign(callable);
}
~Function() {
Release();
}
Function &operator =(decltype(nullptr)) {
Clear();
return *this;
}
Function &operator =(const Function &function) {
Copy(function.abstract_);
return *this;
}
Result_ operator()(Args_... args) const {
return (*abstract_)(args...);
}
void Clear() {
Release();
abstract_ = NULL;
}
template <typename Callable_>
Function &operator =(const Callable_ &callable) {
Assign(callable);
return *this;
}
operator bool() const {
return abstract_ != NULL;
}
};
#endif//Menes_Function_H
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