cpp.react/include/react/Algorithm.h at master · flying7993/cpp.react · GitHub

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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)

#ifndef REACT_ALGORITHM_H_INCLUDED

#define REACT_ALGORITHM_H_INCLUDED

#pragma once

#include "react/detail/Defs.h"

#include <memory>

#include <type_traits>

#include <utility>

#include "react/detail/graph/AlgorithmNodes.h"

/*****************************************/ REACT_BEGIN /*****************************************/

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Forward declarations

///////////////////////////////////////////////////////////////////////////////////////////////////

template <typename D, typename S>

class Signal;

template <typename D, typename S>

class VarSignal;

template <typename D, typename E>

class Events;

template <typename D, typename E>

class EventSource;

enum class Token;

template <typename D, typename ... TValues>

class SignalPack;

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Hold - Hold the most recent event in a signal

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename V,

typename T = typename std::decay<V>::type

auto Hold(const Events<D,T>& events, V&& init)

-> Signal<D,T>

{

using REACT_IMPL::HoldNode;

return Signal<D,T>(

std::make_shared<HoldNode<D,T>>(

std::forward<V>(init), GetNodePtr(events)));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Monitor - Emits value changes of target signal

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename S

auto Monitor(const Signal<D,S>& target)

-> Events<D,S>

{

using REACT_IMPL::MonitorNode;

return Events<D,S>(

std::make_shared<MonitorNode<D, S>>(

GetNodePtr(target)));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Iterate - Iteratively combines signal value with values from event stream (aka Fold)

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename E,

typename V,

typename FIn,

typename S = typename std::decay<V>::type

auto Iterate(const Events<D,E>& events, V&& init, FIn&& func)

-> Signal<D,S>

{

using REACT_IMPL::IterateNode;

using REACT_IMPL::IterateByRefNode;

using REACT_IMPL::AddIterateRangeWrapper;

using REACT_IMPL::AddIterateByRefRangeWrapper;

using REACT_IMPL::IsCallableWith;

using REACT_IMPL::EventRange;

using F = typename std::decay<FIn>::type;

using NodeT =

typename std::conditional<

IsCallableWith<F,S,EventRange<E>,S>::value,

IterateNode<D,S,E,F>,

typename std::conditional<

IsCallableWith<F,S,E,S>::value,

IterateNode<D,S,E,AddIterateRangeWrapper<E,S,F>>,

typename std::conditional<

IsCallableWith<F, void, EventRange<E>, S&>::value,

IterateByRefNode<D,S,E,F>,

typename std::conditional<

IsCallableWith<F,void,E,S&>::value,

IterateByRefNode<D,S,E,AddIterateByRefRangeWrapper<E,S,F>>,

void

>::type

>::type;

static_assert(

! std::is_same<NodeT,void>::value,

"Iterate: Passed function does not match any of the supported signatures.");

return Signal<D,S>(

std::make_shared<NodeT>(

std::forward<V>(init), GetNodePtr(events), std::forward<FIn>(func)));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Iterate - Synced

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename E,

typename V,

typename FIn,

typename ... TDepValues,

typename S = typename std::decay<V>::type

auto Iterate(const Events<D,E>& events, V&& init,

const SignalPack<D,TDepValues...>& depPack, FIn&& func)

-> Signal<D,S>

{

using REACT_IMPL::SyncedIterateNode;

using REACT_IMPL::SyncedIterateByRefNode;

using REACT_IMPL::AddIterateRangeWrapper;

using REACT_IMPL::AddIterateByRefRangeWrapper;

using REACT_IMPL::IsCallableWith;

using REACT_IMPL::EventRange;

using F = typename std::decay<FIn>::type;

using NodeT =

typename std::conditional<

IsCallableWith<F,S,EventRange<E>,S,TDepValues ...>::value,

SyncedIterateNode<D,S,E,F,TDepValues ...>,

typename std::conditional<

IsCallableWith<F,S,E,S,TDepValues ...>::value,

SyncedIterateNode<D,S,E,

AddIterateRangeWrapper<E,S,F,TDepValues ...>,

TDepValues ...>,

typename std::conditional<

IsCallableWith<F,void,EventRange<E>,S&,TDepValues ...>::value,

SyncedIterateByRefNode<D,S,E,F,TDepValues ...>,

typename std::conditional<

IsCallableWith<F,void,E,S&,TDepValues ...>::value,

SyncedIterateByRefNode<D,S,E,

AddIterateByRefRangeWrapper<E,S,F,TDepValues ...>,

TDepValues ...>,

void

>::type

>::type;

static_assert(

! std::is_same<NodeT,void>::value,

"Iterate: Passed function does not match any of the supported signatures.");

//static_assert(NodeT::dummy_error, "DUMP MY TYPE" );

struct NodeBuilder_

{

NodeBuilder_(const Events<D,E>& source, V&& init, FIn&& func) :

MySource( source ),

MyInit( std::forward<V>(init) ),

MyFunc( std::forward<FIn>(func) )

{}

auto operator()(const Signal<D,TDepValues>& ... deps)

-> Signal<D,S>

{

return Signal<D,S>(

std::make_shared<NodeT>(

std::forward<V>(MyInit), GetNodePtr(MySource),

std::forward<FIn>(MyFunc), GetNodePtr(deps) ...));

}

const Events<D,E>& MySource;

V MyInit;

FIn MyFunc;

};

return REACT_IMPL::apply(

NodeBuilder_( events, std::forward<V>(init), std::forward<FIn>(func) ),

depPack.Data);

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Snapshot - Sets signal value to value of other signal when event is received

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename S,

typename E

auto Snapshot(const Events<D,E>& trigger, const Signal<D,S>& target)

-> Signal<D,S>

{

using REACT_IMPL::SnapshotNode;

return Signal<D,S>(

std::make_shared<SnapshotNode<D,S,E>>(

GetNodePtr(target), GetNodePtr(trigger)));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Pulse - Emits value of target signal when event is received

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename S,

typename E

auto Pulse(const Events<D,E>& trigger, const Signal<D,S>& target)

-> Events<D,S>

{

using REACT_IMPL::PulseNode;

return Events<D,S>(

std::make_shared<PulseNode<D,S,E>>(

GetNodePtr(target), GetNodePtr(trigger)));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Changed - Emits token when target signal was changed

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename S

auto Changed(const Signal<D,S>& target)

-> Events<D,Token>

{

return Monitor(target).Tokenize();

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// ChangedTo - Emits token when target signal was changed to value

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename V,

typename S = typename std::decay<V>::type

auto ChangedTo(const Signal<D,S>& target, V&& value)

-> Events<D,Token>

{

return Monitor(target)

.Filter([=] (const S& v) { return v == value; })

.Tokenize();

}

/******************************************/ REACT_END /******************************************/

#endif // REACT_ALGORITHM_H_INCLUDED

cpp.react/include/react/Algorithm.h at master · flying7993/cpp.react · GitHub

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