replace Context::parent() -> Context::children()

file/node_network.cc

@@ -291,10 +291,12 @@ class Network::ExecutionLambda : public nf7::Lambda {
     for (const auto& item : owner.items_) {
       if (auto inode = item->inode()) {
         if (auto lambda = inode->CreateLambdaForOuterInput()) {
+          AddChild(lambda);
           input_handlers_.push_back(std::move(lambda));
         }
       }
       if (auto lambda = item->node().CreateLambda()) {
+        AddChild(lambda);
         subs_[lambda.get()] = SubLambda {.lambda = lambda};
         lmap[item->id()] = std::move(lambda);
       }

nf7.cc

@@ -204,13 +204,16 @@ void File::Path::Validate() const {
   for (const auto& term : terms_) ValidateTerm(term);
 }
 
-Context::Context(Env& env, File::Id initiator, const std::weak_ptr<Context>& parent) noexcept :
-    env_(&env), initiator_(initiator), parent_(parent) {
+Context::Context(Env& env, File::Id initiator) noexcept :
+    env_(&env), initiator_(initiator) {
   env_->AddContext(*this);
 }
 Context::~Context() noexcept {
   env_->RemoveContext(*this);
 }
+void Context::AddChild(const std::shared_ptr<Context>& ctx) noexcept {
+  children_.emplace_back(ctx);
+}
 
 void Env::Push(Env& env) noexcept {
   env_stack_.push_back(&env);

nf7.hh

@@ -212,7 +212,7 @@ class File::NotImplementedException : public Exception {
 class Context {
  public:
   Context() = delete;
-  Context(Env&, File::Id, const std::weak_ptr<Context>& = {}) noexcept;
+  Context(Env&, File::Id) noexcept;
   virtual ~Context() noexcept;
 
   virtual void CleanUp() noexcept { }
@@ -223,14 +223,17 @@ class Context {
 
   Env& env() const noexcept { return *env_; }
   File::Id initiator() const noexcept { return initiator_; }
-  const std::weak_ptr<Context>& parent() const noexcept { return parent_; }
+  std::span<const std::weak_ptr<Context>> children() const noexcept { return children_; }
+
+ protected:
+  void AddChild(const std::shared_ptr<Context>&) noexcept;
 
  private:
   Env* const env_;
 
   const File::Id initiator_;
 
-  std::weak_ptr<Context> parent_;
+  std::vector<std::weak_ptr<Context>> children_;
 };
 
 class Env {