cpp.react/include/react/state.h at master · gitxyf/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_STATE_H_INCLUDED

#define REACT_STATE_H_INCLUDED

#pragma once

#include "react/detail/defs.h"

#include "react/api.h"

#include "react/group.h"

#include "react/common/ptrcache.h"

#include "react/detail/state_nodes.h"

#include <memory>

#include <tuple>

#include <type_traits>

#include <utility>

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

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

/// State

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

template <typename S>

class State : protected REACT_IMPL::StateInternals<S>

{

public:

// Construct with explicit group

template <typename F, typename T1, typename ... Ts>

static State Create(const Group& group, F&& func, const State<T1>& dep1, const State<Ts>& ... deps)

{ return CreateFuncNode(group, std::forward<F>(func), dep1, deps ...); }

// Construct with implicit group

template <typename F, typename T1, typename ... Ts>

static State Create(F&& func, const State<T1>& dep1, const State<Ts>& ... deps)

{ return CreateFuncNode(dep1.GetGroup(), std::forward<F>(func), dep1, deps ...); }

// Construct with constant value

template <typename T>

static State Create(const Group& group, T&& init)

{ return CreateFuncNode(group, [value = std::move(init)] { return value; }); }

State() = default;

State(const State&) = default;

State& operator=(const State&) = default;

State(State&&) = default;

State& operator=(State&&) = default;

auto GetGroup() const -> const Group&

{ return this->GetNodePtr()->GetGroup(); }

auto GetGroup() -> Group&

{ return this->GetNodePtr()->GetGroup(); }

friend bool operator==(const State<S>& a, const State<S>& b)

{ return a.GetNodePtr() == b.GetNodePtr(); }

friend bool operator!=(const State<S>& a, const State<S>& b)

{ return !(a == b); }

friend auto GetInternals(State<S>& s) -> REACT_IMPL::StateInternals<S>&

{ return s; }

friend auto GetInternals(const State<S>& s) -> const REACT_IMPL::StateInternals<S>&

{ return s; }

protected:

State(std::shared_ptr<REACT_IMPL::StateNode<S>>&& nodePtr) :

State::StateInternals( std::move(nodePtr) )

{ }

private:

template <typename F, typename T1, typename ... Ts>

static auto CreateFuncNode(const Group& group, F&& func, const State<T1>& dep1, const State<Ts>& ... deps) -> decltype(auto)

{

using REACT_IMPL::StateFuncNode;

using REACT_IMPL::SameGroupOrLink;

return std::make_shared<StateFuncNode<S, typename std::decay<F>::type, T1, Ts ...>>(

group, std::forward<F>(func), SameGroupOrLink(group, dep1), SameGroupOrLink(group, deps) ...);

}

template <typename RET, typename NODE, typename ... ARGS>

friend RET impl::CreateWrappedNode(ARGS&& ... args);

};

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

/// StateVar

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

template <typename S>

class StateVar : public State<S>

{

public:

// Construct with group + default

static StateVar Create(const Group& group)

{ return CreateVarNode(group); }

// Construct with group + value

template <typename T>

static StateVar Create(const Group& group, T&& value)

{ return CreateVarNode(group, std::forward<T>(value)); }

StateVar() = default;

StateVar(const StateVar&) = default;

StateVar& operator=(const StateVar&) = default;

StateVar(StateVar&&) = default;

StateVar& operator=(StateVar&&) = default;

void Set(const S& newValue)

{ SetValue(newValue); }

void Set(S&& newValue)

{ SetValue(std::move(newValue)); }

template <typename F>

void Modify(const F& func)

{ ModifyValue(func); }

friend bool operator==(const StateVar<S>& a, StateVar<S>& b)

{ return a.GetNodePtr() == b.GetNodePtr(); }

friend bool operator!=(const StateVar<S>& a, StateVar<S>& b)

{ return !(a == b); }

S* operator->()

{ return &this->Value(); }

protected:

StateVar(std::shared_ptr<REACT_IMPL::StateNode<S>>&& nodePtr) :

StateVar::State( std::move(nodePtr) )

{ }

private:

static auto CreateVarNode(const Group& group) -> decltype(auto)

{

using REACT_IMPL::StateVarNode;

return std::make_shared<StateVarNode<S>>(group);

}

template <typename T>

static auto CreateVarNode(const Group& group, T&& value) -> decltype(auto)

{

using REACT_IMPL::StateVarNode;

return std::make_shared<StateVarNode<S>>(group, std::forward<T>(value));

}

template <typename T>

void SetValue(T&& newValue)

{

using REACT_IMPL::NodeId;

using VarNodeType = REACT_IMPL::StateVarNode<S>;

VarNodeType* castedPtr = static_cast<VarNodeType*>(this->GetNodePtr().get());

NodeId nodeId = castedPtr->GetNodeId();

auto& graphPtr = GetInternals(this->GetGroup()).GetGraphPtr();

graphPtr->PushInput(nodeId, [castedPtr, &newValue] { castedPtr->SetValue(std::forward<T>(newValue)); });

}

template <typename F>

void ModifyValue(const F& func)

{

using REACT_IMPL::NodeId;

using VarNodeType = REACT_IMPL::StateVarNode<S>;

VarNodeType* castedPtr = static_cast<VarNodeType*>(this->GetNodePtr().get());

NodeId nodeId = castedPtr->GetNodeId();

auto& graphPtr = GetInternals(this->GetGroup()).GetGraphPtr();

graphPtr->PushInput(nodeId, [castedPtr, &func] { castedPtr->ModifyValue(func); });

}

};

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

/// StateSlotBase

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

template <typename S>

class StateSlot : public State<S>

{

public:

// Construct with explicit group

static StateSlot Create(const Group& group, const State<S>& input)

{ return CreateSlotNode(group, input); }

// Construct with implicit group

static StateSlot Create(const State<S>& input)

{ return CreateSlotNode(input.GetGroup(), input); }

StateSlot() = default;

StateSlot(const StateSlot&) = default;

StateSlot& operator=(const StateSlot&) = default;

StateSlot(StateSlot&&) = default;

StateSlot& operator=(StateSlot&&) = default;

void Set(const State<S>& newInput)

{ SetSlotInput(newInput); }

protected:

StateSlot(std::shared_ptr<REACT_IMPL::StateNode<S>>&& nodePtr) :

StateSlot::State( std::move(nodePtr) )

{ }

private:

static auto CreateSlotNode(const Group& group, const State<S>& input) -> decltype(auto)

{

using REACT_IMPL::StateSlotNode;

using REACT_IMPL::SameGroupOrLink;

return std::make_shared<StateSlotNode<S>>(group, SameGroupOrLink(group, input));

}

void SetSlotInput(const State<S>& newInput)

{

using REACT_IMPL::NodeId;

using REACT_IMPL::StateSlotNode;

using REACT_IMPL::SameGroupOrLink;

auto* castedPtr = static_cast<StateSlotNode<S>*>(this->GetNodePtr().get());

NodeId nodeId = castedPtr->GetInputNodeId();

auto& graphPtr = GetInternals(this->GetGroup()).GetGraphPtr();

graphPtr->PushInput(nodeId, [this, castedPtr, &newInput] { castedPtr->SetInput(SameGroupOrLink(GetGroup(), newInput)); });

}

};

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

/// StateLink

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

template <typename S>

class StateLink : public State<S>

{

public:

// Construct with group

static StateLink Create(const Group& group, const State<S>& input)

{ return GetOrCreateLinkNode(group, input); }

StateLink() = default;

StateLink(const StateLink&) = default;

StateLink& operator=(const StateLink&) = default;

StateLink(StateLink&&) = default;

StateLink& operator=(StateLink&&) = default;

protected:

StateLink(std::shared_ptr<REACT_IMPL::StateNode<S>>&& nodePtr) :

StateLink::State( std::move(nodePtr) )

{ }

private:

static auto GetOrCreateLinkNode(const Group& group, const State<S>& input) -> decltype(auto)

{

using REACT_IMPL::StateLinkNode;

using REACT_IMPL::IReactNode;

using REACT_IMPL::ReactGraph;

IReactNode* k = GetInternals(input).GetNodePtr().get();

ReactGraph::LinkCache& linkCache = GetInternals(group).GetGraphPtr()->GetLinkCache();

std::shared_ptr<IReactNode> nodePtr = linkCache.LookupOrCreate(k, [&]

{

auto nodePtr = std::make_shared<StateLinkNode<S>>(group, input);

nodePtr->SetWeakSelfPtr(std::weak_ptr<StateLinkNode<S>>{ nodePtr });

return std::static_pointer_cast<IReactNode>(nodePtr);

});

return std::static_pointer_cast<StateLinkNode<S>>(nodePtr);

}

};

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

/// CreateRef

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

template <typename S>

auto CreateRef(const State<S>& state) -> State<Ref<S>>

{

using REACT_IMPL::StateRefNode;

using REACT_IMPL::CreateWrappedNode;

return CreateWrappedNode<State<Ref<S>>, StateRefNode<S>>(state.GetGroup(), state);

}

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

#endif // REACT_STATE_H_INCLUDED

cpp.react/include/react/state.h at master · gitxyf/cpp.react · GitHub

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