cpp.react/include/react/algorithm.h at master · HolyCaonima/cpp.react · GitHub

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// Copyright Sebastian Jeckel 2017.

// 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/api.h"

#include "react/state.h"

#include "react/event.h"

#include "react/detail/algorithm_nodes.h"

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

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

/// Holds the most recent event in a state

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

template <typename T, typename E>

auto Hold(const Group& group, T&& initialValue, const Event<E>& evnt) -> State<E>

{

using REACT_IMPL::HoldNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<E>, HoldNode<E>>(

group, std::forward<T>(initialValue), SameGroupOrLink(group, evnt));

}

template <typename T, typename E>

auto Hold(T&& initialValue, const Event<E>& evnt) -> State<E>

{ return Hold(evnt.GetGroup(), std::forward<T>(initialValue), evnt); }

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

/// Emits value changes of target state.

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

template <typename S>

auto Monitor(const Group& group, const State<S>& state) -> Event<S>

{

using REACT_IMPL::MonitorNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<Event<S>, MonitorNode<S>>(

group, SameGroupOrLink(group, state));

}

template <typename S>

auto Monitor(const State<S>& state) -> Event<S>

{ return Monitor(state.GetGroup(), state); }

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

/// Iteratively combines state value with values from event stream (aka Fold)

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

template <typename S, typename T, typename F, typename E>

auto Iterate(const Group& group, T&& initialValue, F&& func, const Event<E>& evnt) -> State<S>

{

using REACT_IMPL::IterateNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

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

return CreateWrappedNode<State<S>, IterateNode<S, FuncType, E>>(

group, std::forward<T>(initialValue), std::forward<F>(func), SameGroupOrLink(group, evnt));

}

template <typename S, typename T, typename F, typename E>

auto IterateByRef(const Group& group, T&& initialValue, F&& func, const Event<E>& evnt) -> State<S>

{

using REACT_IMPL::IterateByRefNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

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

return CreateWrappedNode<State<S>, IterateByRefNode<S, FuncType, E>>(

group, std::forward<T>(initialValue), std::forward<F>(func), SameGroupOrLink(group, evnt));

}

template <typename S, typename T, typename F, typename E>

auto Iterate(T&& initialValue, F&& func, const Event<E>& evnt) -> State<S>

{ return Iterate<S>(evnt.GetGroup(), std::forward<T>(initialValue), std::forward<F>(func), evnt); }

template <typename S, typename T, typename F, typename E>

auto IterateByRef(T&& initialValue, F&& func, const Event<E>& evnt) -> State<S>

{ return IterateByRef<S>(evnt.GetGroup(), std::forward<T>(initialValue), std::forward<F>(func), evnt); }

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

/// Iterate - Synced

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

template <typename S, typename T, typename F, typename E, typename ... Us>

auto Iterate(const Group& group, T&& initialValue, F&& func, const Event<E>& evnt, const State<Us>& ... states) -> State<S>

{

using REACT_IMPL::SyncedIterateNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

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

return CreateWrappedNode<State<S>, SyncedIterateNode<S, FuncType, E, Us ...>>(

group, std::forward<T>(initialValue), std::forward<F>(func), SameGroupOrLink(group, evnt), SameGroupOrLink(group, states) ...);

}

template <typename S, typename T, typename F, typename E, typename ... Us>

auto IterateByRef(const Group& group, T&& initialValue, F&& func, const Event<E>& evnt, const State<Us>& ... states) -> State<S>

{

using REACT_IMPL::SyncedIterateByRefNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

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

return CreateWrappedNode<State<S>, SyncedIterateByRefNode<S, FuncType, E, Us ...>>(

group, std::forward<T>(initialValue), std::forward<F>(func), SameGroupOrLink(group, evnt), SameGroupOrLink(group, states) ...);

}

template <typename S, typename T, typename F, typename E, typename ... Us>

auto Iterate(T&& initialValue, F&& func, const Event<E>& evnt, const State<Us>& ... states) -> State<S>

{ return Iterate<S>(evnt.GetGroup(), std::forward<T>(initialValue), std::forward<F>(func), evnt, states ...); }

template <typename S, typename T, typename F, typename E, typename ... Us>

auto IterateByRef(T&& initialValue, F&& func, const Event<E>& evnt, const State<Us>& ... states) -> State<S>

{ return IterateByRef<S>(evnt.GetGroup(), std::forward<T>(initialValue), std::forward<F>(func), evnt, states ...); }

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

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

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

template <typename S, typename E>

auto Snapshot(const Group& group, const State<S>& state, const Event<E>& evnt) -> State<S>

{

using REACT_IMPL::SnapshotNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<S>, SnapshotNode<S, E>>(

group, SameGroupOrLink(group, state), SameGroupOrLink(group, evnt));

}

template <typename S, typename E>

auto Snapshot(const State<S>& state, const Event<E>& evnt) -> State<S>

{ return Snapshot(state.GetGroup(), state, evnt); }

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

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

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

template <typename S, typename E>

auto Pulse(const Group& group, const State<S>& state, const Event<E>& evnt) -> Event<S>

{

using REACT_IMPL::PulseNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<Event<S>, PulseNode<S, E>>(

group, SameGroupOrLink(group, state), SameGroupOrLink(group, evnt));

}

template <typename S, typename E>

auto Pulse(const State<S>& state, const Event<E>& evnt) -> Event<S>

{ return Pulse(state.GetGroup(), state, evnt); }

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

/// Flatten

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

template <typename S, template <typename> class TState,

typename = std::enable_if_t<std::is_base_of_v<State<S>, TState<S>>>>

auto Flatten(const Group& group, const State<TState<S>>& state) -> State<S>

{

using REACT_IMPL::FlattenStateNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<S>, FlattenStateNode<S, TState>>(group, SameGroupOrLink(group, state));

}

template <typename S, template <typename> class TState,

typename = std::enable_if_t<std::is_base_of_v<State<S>, TState<S>>>>

auto Flatten(const State<TState<S>>& state) -> State<S>

{ return Flatten(state.GetGroup(), state); }

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

/// FlattenList

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

template <template <typename ...> class TList, template <typename> class TState, typename V, typename ... TParams,

typename = std::enable_if_t<std::is_base_of_v<State<V>, TState<V>>>>

auto FlattenList(const Group& group, const State<TList<TState<V>, TParams ...>>& list) -> State<TList<V>>

{

using REACT_IMPL::FlattenStateListNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<TList<V>>, FlattenStateListNode<TList, TState, V, TParams ...>>(

group, SameGroupOrLink(group, list));

}

template <template <typename ...> class TList, template <typename> class TState, typename V, typename ... TParams,

typename = std::enable_if_t<std::is_base_of_v<State<V>, TState<V>>>>

auto FlattenList(const State<TList<TState<V>, TParams ...>>& list) -> State<TList<V>>

{ return FlattenList(list.GetGroup(), list); }

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

/// FlattenMap

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

template <template <typename ...> class TMap, template <typename> class TState, typename K, typename V, typename ... TParams,

typename = std::enable_if_t<std::is_base_of_v<State<V>, TState<V>>>>

auto FlattenMap(const Group& group, const State<TMap<K, TState<V>, TParams ...>>& map) -> State<TMap<K, V>>

{

using REACT_IMPL::FlattenStateMapNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<TMap<K, V>>, FlattenStateMapNode<TMap, TState, K, V, TParams ...>>(

group, SameGroupOrLink(group, map));

}

template <template <typename ...> class TMap, template <typename> class TState, typename K, typename V, typename ... TParams,

typename = std::enable_if_t<std::is_base_of_v<State<V>, TState<V>>>>

auto FlattenMap(const State<TMap<K, TState<V>, TParams ...>>& map) -> State<TMap<K, V>>

{ return FlattenMap(map.GetGroup(), map); }

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

/// Flattened

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

template <typename C>

class Flattened : public C

{

public:

using C::C;

Flattened(const C& base) :

C( base )

{ }

Flattened(const C& base, REACT_IMPL::FlattenedInitTag) :

C( base ),

initMode_( true )

{ }

Flattened(const C& base, REACT_IMPL::FlattenedInitTag, std::vector<REACT_IMPL::NodeId>&& emptyMemberIds) :

C( base ),

initMode_( true ),

memberIds_( std::move(emptyMemberIds) ) // This will be empty, but has pre-allocated storage. It's a tweak.

{ }

template <typename T>

Ref<T> Flatten(State<T>& signal)

{

if (initMode_)

memberIds_.push_back(GetInternals(signal).GetNodeId());

return GetInternals(signal).Value();

}

private:

bool initMode_ = false;

std::vector<REACT_IMPL::NodeId> memberIds_;

template <typename T, typename TFlat>

friend class impl::FlattenObjectNode;

};

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

/// FlattenObject

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

template <typename T, typename TFlat = typename T::Flat>

auto FlattenObject(const Group& group, const State<T>& obj) -> State<TFlat>

{

using REACT_IMPL::FlattenObjectNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<TFlat>, FlattenObjectNode<T, TFlat>>(group, obj);

}

template <typename T, typename TFlat = typename T::Flat>

auto FlattenObject(const State<T>& obj) -> State<TFlat>

{ return FlattenObject(obj.GetGroup(), obj); }

template <typename T, typename TFlat = typename T::Flat>

auto FlattenObject(const Group& group, const State<Ref<T>>& obj) -> State<TFlat>

{

using REACT_IMPL::FlattenObjectNode;

using REACT_IMPL::SameGroupOrLink;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<TFlat>, FlattenObjectNode<Ref<T>, TFlat>>(group, obj);

}

template <typename T, typename TFlat = typename T::Flat>

auto FlattenObject(const State<Ref<T>>& obj) -> State<TFlat>

{ return FlattenObject(obj.GetGroup(), obj); }

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

#endif // REACT_ALGORITHM_H_INCLUDED

cpp.react/include/react/algorithm.h at master · HolyCaonima/cpp.react · GitHub

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