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// Copyright Sebastian Jeckel 2014.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#pragma once
#include "react/detail/Defs.h"
#include <thread>
#include <type_traits>
#include <utility>
#include <vector>
#include "react/Observer.h"
#include "react/detail/EventBase.h"
/*****************************************/ REACT_BEGIN /*****************************************/
enum class EventToken { token };
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Events
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename E = EventToken
>
class Events : public REACT_IMPL::EventStreamBase<D,E>
{
protected:
using BaseT = REACT_IMPL::EventStreamBase<D,E>;
private:
using NodeT = REACT_IMPL::EventStreamNode<D,E>;
using NodePtrT = REACT_IMPL::SharedPtrT<NodeT>;
public:
using ValueT = E;
Events() = default;
Events(const Events&) = default;
Events(Events&& other) :
EventStreamBase{ std::move(other) }
{}
explicit Events(NodePtrT&& nodePtr) :
EventStreamBase{ std::move(nodePtr) }
{}
template <typename F>
Events Filter(F&& f)
{
return REACT::Filter(*this, std::forward<F>(f));
}
template <typename F>
Events Transform(F&& f)
{
return REACT::Transform(*this, std::forward<F>(f));
}
template <typename F>
Observer<D> Observe(F&& f)
{
return REACT::Observe(*this, std::forward<F>(f));
}
};
// Specialize for references
template
<
typename D,
typename E
>
class Events<D,E&> : public REACT_IMPL::EventStreamBase<D,std::reference_wrapper<E>>
{
protected:
using BaseT = REACT_IMPL::EventStreamBase<D,std::reference_wrapper<E>>;
private:
using NodeT = REACT_IMPL::EventStreamNode<D,std::reference_wrapper<E>>;
using NodePtrT = REACT_IMPL::SharedPtrT<NodeT>;
public:
using ValueT = std::reference_wrapper<E>;
Events() = default;
Events(const Events&) = default;
Events(Events&& other) :
EventStreamBase{ std::move(other) }
{}
explicit Events(NodePtrT&& nodePtr) :
EventStreamBase{ std::move(nodePtr) }
{}
template <typename F>
Events Filter(F&& f)
{
return REACT::Filter(*this, std::forward<F>(f));
}
template <typename F>
Events Transform(F&& f)
{
return REACT::Transform(*this, std::forward<F>(f));
}
template <typename F>
Observer<D> Observe(F&& f)
{
return REACT::Observe(*this, std::forward<F>(f));
}
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// EventSource
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename E = EventToken
>
class EventSource : public Events<D,E>
{
private:
using NodeT = REACT_IMPL::EventSourceNode<D,E>;
using NodePtrT = REACT_IMPL::SharedPtrT<NodeT>;
public:
EventSource() = default;
EventSource(const EventSource&) = default;
EventSource(EventSource&& other) :
Events{ std::move(other) }
{}
explicit EventSource(NodePtrT&& nodePtr) :
Events{ std::move(nodePtr) }
{}
template <typename T>
void Emit(T&& e) const
{
BaseT::emit(std::forward<T>(e));
}
template <class = std::enable_if<std::is_same<E,EventToken>::value>::type>
void Emit() const
{
BaseT::emit(EventToken::token);
}
template <typename T>
const EventSource& operator<<(T&& e) const
{
BaseT::emit(std::forward<T>(e));
return *this;
}
};
// Specialize for references
template
<
typename D,
typename E
>
class EventSource<D,E&> : public Events<D,std::reference_wrapper<E>>
{
private:
using NodeT = REACT_IMPL::EventSourceNode<D,std::reference_wrapper<E>>;
using NodePtrT = REACT_IMPL::SharedPtrT<NodeT>;
public:
EventSource() = default;
EventSource(const EventSource&) = default;
EventSource(EventSource&& other) :
Events{ std::move(other) }
{}
explicit EventSource(NodePtrT&& nodePtr) :
Events{ std::move(nodePtr) }
{}
void Emit(std::reference_wrapper<E> e) const
{
BaseT::emit(e);
}
template <typename T>
const EventSource& operator<<(std::reference_wrapper<E> e) const
{
BaseT::emit(e);
return *this;
}
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// TempEvents
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename E,
typename TOp
>
class TempEvents : public Events<D,E>
{
protected:
using NodeT = REACT_IMPL::EventOpNode<D,E,TOp>;
using NodePtrT = REACT_IMPL::SharedPtrT<NodeT>;
public:
TempEvents() = default;
TempEvents(const TempEvents&) = default;
TempEvents(TempEvents&& other) :
Events{ std::move(other) }
{}
explicit TempEvents(NodePtrT&& nodePtr) :
Events{ std::move(nodePtr) }
{}
TOp StealOp()
{
return std::move(std::static_pointer_cast<NodeT>(ptr_)->StealOp());
}
};
/******************************************/ REACT_END /******************************************/
/***************************************/ REACT_IMPL_BEGIN /**************************************/
template <typename D, typename L, typename R>
bool Equals(const Events<D,L>& lhs, const Events<D,R>& rhs)
{
return lhs.Equals(rhs);
}
/****************************************/ REACT_IMPL_END /***************************************/
/*****************************************/ REACT_BEGIN /*****************************************/
///////////////////////////////////////////////////////////////////////////////////////////////////
/// MakeEventSource
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename E>
auto MakeEventSource()
-> EventSource<D,E>
{
return EventSource<D,E>(
std::make_shared<REACT_IMPL::EventSourceNode<D,E>>());
}
template <typename D>
auto MakeEventSource()
-> EventSource<D,EventToken>
{
return EventSource<D,EventToken>(
std::make_shared<REACT_IMPL::EventSourceNode<D,EventToken>>());
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Merge
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename TArg1,
typename ... TArgs,
typename E = TArg1,
typename TOp = REACT_IMPL::EventMergeOp<E,
REACT_IMPL::EventStreamNodePtrT<D,TArg1>,
REACT_IMPL::EventStreamNodePtrT<D,TArgs> ...>
>
auto Merge(const Events<D,TArg1>& arg1, const Events<D,TArgs>& ... args)
-> TempEvents<D,E,TOp>
{
static_assert(sizeof...(TArgs) > 0,
"react::Merge requires at least 2 arguments.");
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
arg1.NodePtr(), args.NodePtr() ...));
}
template
<
typename TLeftEvents,
typename TRightEvents,
typename D = TLeftEvents::DomainT,
typename TLeftVal = TLeftEvents::ValueT,
typename TRightVal = TRightEvents::ValueT,
typename E = TLeftVal,
typename TOp = REACT_IMPL::EventMergeOp<E,
REACT_IMPL::EventStreamNodePtrT<D,TLeftVal>,
REACT_IMPL::EventStreamNodePtrT<D,TRightVal>>,
class = std::enable_if<
IsEvent<TLeftEvents>::value>::type,
class = std::enable_if<
IsEvent<TRightEvents>::value>::type
>
auto operator|(const TLeftEvents& lhs, const TRightEvents& rhs)
-> TempEvents<D,E,TOp>
{
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
lhs.NodePtr(), rhs.NodePtr()));
}
template
<
typename D,
typename TLeftVal,
typename TLeftOp,
typename TRightVal,
typename TRightOp,
typename E = TLeftVal,
typename TOp = REACT_IMPL::EventMergeOp<E,TLeftOp,TRightOp>
>
auto operator|(TempEvents<D,TLeftVal,TLeftOp>&& lhs, TempEvents<D,TRightVal,TRightOp>&& rhs)
-> TempEvents<D,E,TOp>
{
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
lhs.StealOp(), rhs.StealOp()));
}
template
<
typename D,
typename TLeftVal,
typename TLeftOp,
typename TRightEvents,
typename TRightVal = TRightEvents::ValueT,
typename E = TLeftVal,
typename TOp = REACT_IMPL::EventMergeOp<E,
TLeftOp,
REACT_IMPL::EventStreamNodePtrT<D,TRightVal>>,
class = std::enable_if<
IsEvent<TRightEvents>::value>::type
>
auto operator|(TempEvents<D,TLeftVal,TLeftOp>&& lhs, const TRightEvents& rhs)
-> TempEvents<D,E,TOp>
{
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
lhs.StealOp(), rhs.NodePtr()));
}
template
<
typename TLeftEvents,
typename D,
typename TRightVal,
typename TRightOp,
typename TLeftVal = TLeftEvents::ValueT,
typename E = TLeftVal,
typename TOp = REACT_IMPL::EventMergeOp<E,
REACT_IMPL::EventStreamNodePtrT<D,TRightVal>,
TRightOp>,
class = std::enable_if<
IsEvent<TLeftEvents>::value>::type
>
auto operator|(const TLeftEvents& lhs, TempEvents<D,TRightVal,TRightOp>&& rhs)
-> TempEvents<D,E,TOp>
{
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
lhs.NodePtr(), rhs.StealOp()));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Filter
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename E,
typename FIn,
typename F = std::decay<FIn>::type,
typename TOp = REACT_IMPL::EventFilterOp<E,F,
REACT_IMPL::EventStreamNodePtrT<D,E>>
>
auto Filter(const Events<D,E>& src, FIn&& filter)
-> TempEvents<D,E,TOp>
{
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
std::forward<FIn>(filter), src.NodePtr()));
}
template
<
typename D,
typename E,
typename TOpIn,
typename FIn,
typename F = std::decay<FIn>::type,
typename TOpOut = REACT_IMPL::EventFilterOp<E,F,TOpIn>
>
auto Filter(TempEvents<D,E,TOpIn>&& src, FIn&& filter)
-> TempEvents<D,E,TOpOut>
{
return TempEvents<D,E,TOpOut>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOpOut>>(
std::forward<FIn>(filter), src.StealOp()));
}
template
<
typename TEvents,
typename F,
class = std::enable_if<
IsEvent<TEvents>::value>::type
>
auto operator&(TEvents&& src, F&& filter)
-> decltype(Filter(std::forward<TEvents>(src), std::forward<F>(filter)))
{
return Filter(std::forward<TEvents>(src), std::forward<F>(filter));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Transform
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename E,
typename FIn,
typename F = std::decay<FIn>::type,
typename TOp = REACT_IMPL::EventTransformOp<E,F,
REACT_IMPL::EventStreamNodePtrT<D,E>>
>
auto Transform(const Events<D,E>& src, FIn&& func)
-> TempEvents<D,E,TOp>
{
return TempEvents<D,E,TOp>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOp>>(
std::forward<FIn>(func), src.NodePtr()));
}
template
<
typename D,
typename E,
typename TOpIn,
typename FIn,
typename F = std::decay<FIn>::type,
typename TOpOut = REACT_IMPL::EventTransformOp<E,F,TOpIn>
>
auto Transform(TempEvents<D,E,TOpIn>&& src, FIn&& func)
-> TempEvents<D,E,TOpOut>
{
return TempEvents<D,E,TOpOut>(
std::make_shared<REACT_IMPL::EventOpNode<D,E,TOpOut>>(
std::forward<FIn>(func), src.StealOp()));
}
template
<
typename TEvents,
typename F,
class = std::enable_if<
IsEvent<TEvents>::value>::type
>
auto operator->*(TEvents&& src, F&& func)
-> decltype(Transform(std::forward<TEvents>(src), std::forward<F>(func)))
{
return Transform(std::forward<TEvents>(src), std::forward<F>(func));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Flatten
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename TInnerValue
>
auto Flatten(const Signal<D,Events<D,TInnerValue>>& node)
-> Events<D,TInnerValue>
{
return Events<D,TInnerValue>(
std::make_shared<REACT_IMPL::EventFlattenNode<D, Events<D,TInnerValue>, TInnerValue>>(
node.NodePtr(), node().NodePtr()));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Observe
///////////////////////////////////////////////////////////////////////////////////////////////////
template
<
typename D,
typename FIn,
typename TArg,
class = std::enable_if<
! std::is_same<TArg,EventToken>::value>::type
>
auto Observe(const Events<D,TArg>& subject, FIn&& func)
-> Observer<D>
{
using F = std::decay<FIn>::type;
using TNode = REACT_IMPL::EventObserverNode<D,TArg,F>;
auto* raw = REACT_IMPL::DomainSpecificObserverRegistry<D>::Instance().
template Register<TNode>(subject, std::forward<FIn>(func));
return Observer<D>(raw, subject.NodePtr());
}
template
<
typename D,
typename FIn
>
auto Observe(const Events<D,EventToken>& subject, FIn&& func)
-> Observer<D>
{
auto wrapper = [func] (EventToken _) { func(); };
using TNode = REACT_IMPL::EventObserverNode<D,EventToken,decltype(wrapper)>;
auto* raw = REACT_IMPL::DomainSpecificObserverRegistry<D>::Instance().
template Register<TNode>(subject, std::move(wrapper));
return Observer<D>(raw, subject.NodePtr());
}
/******************************************/ REACT_END /******************************************/