PortableHostObjectReadRules.h File Reference

#include <TGenericClassInfo.h>
#include <TVirtualObject.h>
#include "DataFormats/Portable/interface/PortableHostObject.h"
#include "FWCore/Utilities/interface/concatenate.h"
#include "FWCore/Utilities/interface/stringize.h"

Go to the source code of this file.

Namespaces
	ROOT

Macros
#define	SET_PORTABLEHOSTOBJECT_READ_RULES(OBJECT)

Functions
template<typename T >
static void	readPortableHostObject_v1 (char *target, TVirtualObject *from_buffer)
template<typename T >
static bool	ROOT::set_PortableHostObject_read_rules (std::string const &type)

Macro Definition Documentation

SET_PORTABLEHOSTOBJECT_READ_RULES

#define SET_PORTABLEHOSTOBJECT_READ_RULES

(

OBJECT

)

Value:

static bool EDM_CONCATENATE(set_PortableHostObject_read_rules_done_at_, __LINE__) [[maybe_unused]] = \
      ROOT::set_PortableHostObject_read_rules<OBJECT>(EDM_STRINGIZE(OBJECT))

Definition at line 72 of file PortableHostObjectReadRules.h.

Function Documentation

readPortableHostObject_v1()

template<typename T >

static void readPortableHostObject_v1 ( char *  target, TVirtualObject *  from_buffer  )

static

Definition at line 13 of file PortableHostObjectReadRules.h.

References filterCSVwithJSON::target.

                                                                                 {
  // extract the actual types
  using Object = T;
  using Product = typename Object::Product;

  // valid only for PortableHostObject<T>
  static_assert(std::is_same_v<Object, PortableHostObject<Product>>);

  // proxy for the object being read from file
  struct OnFile {
    Product *product_;
  };

  // address in memory of the buffer containing the object being read from file
  char *address = static_cast<char *>(from_buffer->GetObject());
  // offset of the "product_" data member
  static ptrdiff_t product_offset = from_buffer->GetClass()->GetDataMemberOffset("product_");
  // pointer to the Product object being read from file
  OnFile onfile = {*(Product **)(address + product_offset)};

  // pointer to the Object object being constructed in memory
  Object *newObj = (Object *)target;

  // move the data from the on-file layout to the newly constructed object
  Object::ROOTReadStreamer(newObj, *onfile.product_);
}