embedder_struct_macros.h File Reference

#include <type_traits>

Go to the source code of this file.

Macros
#define	STRUCT_HAS_MEMBER(pointer, member)
#define	SAFE_ACCESS(pointer, member, default_value)
#define	SAFE_EXISTS(pointer, member)    (SAFE_ACCESS(pointer, member, nullptr) != nullptr)
	Checks if the member exists and is non-null.
#define	SAFE_EXISTS_ONE_OF(pointer, member1, member2)    (SAFE_EXISTS(pointer, member1) != SAFE_EXISTS(pointer, member2))
	Checks if exactly one of member1 or member2 exists and is non-null.

Macro Definition Documentation

SAFE_ACCESS

#define SAFE_ACCESS	(		pointer,
			member,
			default_value
	)

Value:

  ([=]() {                                                          \
    if (STRUCT_HAS_MEMBER(pointer, member)) {                       \
      return pointer->member;                                       \
    }                                                               \
    return static_cast<decltype(pointer->member)>((default_value)); \
  })()

Definition at line 16 of file embedder_struct_macros.h.

         {                                                          \
    if (STRUCT_HAS_MEMBER(pointer, member)) {                       \
      return pointer->member;                                       \
    }                                                               \
    return static_cast<decltype(pointer->member)>((default_value)); \
  })()

SAFE_EXISTS

#define SAFE_EXISTS	(		pointer,
			member
	)		(SAFE_ACCESS(pointer, member, nullptr) != nullptr)

Checks if the member exists and is non-null.

Definition at line 25 of file embedder_struct_macros.h.

SAFE_EXISTS_ONE_OF

#define SAFE_EXISTS_ONE_OF	(		pointer,
			member1,
			member2
	)		(SAFE_EXISTS(pointer, member1) != SAFE_EXISTS(pointer, member2))

Checks if exactly one of member1 or member2 exists and is non-null.

Definition at line 29 of file embedder_struct_macros.h.

STRUCT_HAS_MEMBER

#define STRUCT_HAS_MEMBER	(		pointer,
			member
	)

Value:

  ((offsetof(std::remove_pointer<decltype(pointer)>::type, member) + \
        sizeof(pointer->member) <=                                   \
    pointer->struct_size))

Definition at line 11 of file embedder_struct_macros.h.