allocator.h File Reference

#include <stdbool.h>
#include <stddef.h>
#include "rcutils/macros.h"
#include "rcutils/types/rcutils_ret.h"
#include "rcutils/visibility_control.h"

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Classes
struct	rcutils_allocator_t
	Encapsulation of an allocator. More...

Macros
#define	RCUTILS_CHECK_ALLOCATOR(allocator, fail_statement)
#define	RCUTILS_CHECK_ALLOCATOR_WITH_MSG(allocator, msg, fail_statement)

Typedefs
typedef struct rcutils_allocator_t	rcutils_allocator_t
	Encapsulation of an allocator. More...

Functions
rcutils_allocator_t	rcutils_get_zero_initialized_allocator (void)
	Return a zero initialized allocator. More...
rcutils_allocator_t	rcutils_get_default_allocator (void)
	Return a properly initialized rcutils_allocator_t with default values. More...
bool	rcutils_allocator_is_valid (const rcutils_allocator_t *allocator)
	Return true if the given allocator has non-null function pointers. More...
void *	rcutils_reallocf (void *pointer, size_t size, rcutils_allocator_t *allocator)
	Emulate the behavior of reallocf. More...

Macro Definition Documentation

RCUTILS_CHECK_ALLOCATOR

#define RCUTILS_CHECK_ALLOCATOR	(		allocator,
			fail_statement
	)

Value:

if (!rcutils_allocator_is_valid(allocator)) { \
    fail_statement; \
  }

RCUTILS_CHECK_ALLOCATOR_WITH_MSG

#define RCUTILS_CHECK_ALLOCATOR_WITH_MSG	(		allocator,
			msg,
			fail_statement
	)

Value:

if (!rcutils_allocator_is_valid(allocator)) { \
    RCUTILS_SET_ERROR_MSG(msg); \
    fail_statement; \
  }

Typedef Documentation

rcutils_allocator_t

typedef struct rcutils_allocator_t rcutils_allocator_t

Encapsulation of an allocator.

The default allocator uses malloc(), free(), calloc(), and realloc(). It can be obtained using rcutils_get_default_allocator().

The allocator should be trivially copyable. Meaning that the struct should continue to work after being assignment copied into a new struct. Specifically the object pointed to by the state pointer should remain valid until all uses of the allocator have been made. Particular care should be taken when giving an allocator to functions like rcutils_*_init() where it is stored within another object and used later. Developers should note that, while the fields of a const-qualified allocator struct cannot be modified, the state of the allocator can be modified.

Function Documentation

rcutils_get_zero_initialized_allocator()

rcutils_allocator_t rcutils_get_zero_initialized_allocator

(

void

)

Return a zero initialized allocator.

Note that this is an invalid allocator and should only be used as a placeholder.

rcutils_get_default_allocator()

rcutils_allocator_t rcutils_get_default_allocator

(

void

)

Return a properly initialized rcutils_allocator_t with default values.

This defaults to:

• allocate = wraps malloc()
• deallocate = wraps free()
• reallocate = wraps realloc()
• zero_allocate = wraps calloc()
• state = NULL

---

Attribute	Adherence
Allocates Memory	No
Thread-Safe	Yes
Uses Atomics	No
Lock-Free	Yes

rcutils_allocator_is_valid()

bool rcutils_allocator_is_valid

(

const rcutils_allocator_t *

allocator

)

Return true if the given allocator has non-null function pointers.

Will also return false if the allocator pointer is null.

rcutils_reallocf()

void* rcutils_reallocf	(	void *	pointer,
		size_t	size,
		rcutils_allocator_t *	allocator
	)

Emulate the behavior of reallocf.

This function will return NULL if the allocator is NULL or has NULL for function pointer fields.