Structure access

Structure access helpers. More...

Macros
#define	NULL_SAFE_FIELD_ACCESS(struct_ptr, field_name, default_value)    ((struct_ptr) ? ((struct_ptr)->field_name) : (default_value))
	Read a structure field through a pointer that may be NULL.

Detailed Description

Structure access helpers.

Macro Definition Documentation

NULL_SAFE_FIELD_ACCESS

#define NULL_SAFE_FIELD_ACCESS	(		struct_ptr,
			field_name,
			default_value
	)		((struct_ptr) ? ((struct_ptr)->field_name) : (default_value))

Read a structure field through a pointer that may be NULL.

Parameters

struct_ptr	Pointer to the structure, evaluated twice.
field_name	Field to read.
default_value	Value when struct_ptr is NULL.

Returns

struct_ptr->field_name, or default_value.