Class AsVisitor

include/process/event.hpp:85–90

  {
    const T* result = nullptr;
    struct AsVisitor : EventVisitor
    {
      explicit AsVisitor(const T** _result) : result(_result) {}
      void visit(const T& t) override { *result = &t; }
      const T** result;
    } visitor(&result);
    visit(&visitor);
    if (result == nullptr) {
      ABORT("Attempting to \"cast\" event incorrectly!");