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  4. qbarray.h(3)

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qbarray.h(3) libqb qbarray.h(3)

NAME

qbarray.h -

This is a dynamic array (it can grow, but without moving memory).

SYNOPSIS

#include <stdint.h>
#include <unistd.h>
#include <qb/qbdefs.h>

Typedefs


typedef struct qb_array qb_array_t
This is an opaque data type representing an instance of an array. typedef void(* qb_array_new_bin_cb_fn )(qb_array_t *a, uint32_t bin)

Functions


qb_array_t * qb_array_create (size_t max_elements, size_t element_size)
Create an array with fixed sized elements. qb_array_t * qb_array_create_2 (size_t max_elements, size_t element_size, size_t autogrow_elements)
Create an array with fixed sized elements. int32_t qb_array_index (qb_array_t *a, int32_t idx, void **element_out)
Get an element at a particular index. int32_t qb_array_grow (qb_array_t *a, size_t max_elements)
Grow the array. size_t qb_array_num_bins_get (qb_array_t *a)
Get the number of bins used or the array. size_t qb_array_elems_per_bin_get (qb_array_t *a)
Get the number of elements per bin. int32_t qb_array_new_bin_cb_set (qb_array_t *a, qb_array_new_bin_cb_fn fn)
Get a callback when a new bin is allocated. void qb_array_free (qb_array_t *a)
Free all the memory used by the array.

Detailed Description

This is a dynamic array (it can grow, but without moving memory).

arr = qb_array_create_2(64, sizeof(struct my_struct), 256);
...
res = qb_array_index(arr, idx, (void**)&my_ptr);
if (res < 0) {


     return res;
}
// use my_ptr, now even if there is a grow, this pointer will be valid.

Typedef Documentation

typedef void(* qb_array_new_bin_cb_fn)(qb_array_t *a, uint32_t bin)

typedef struct qb_array qb_array_t

This is an opaque data type representing an instance of an array.

Function Documentation

qb_array_t* qb_array_create (size_tmax_elements, size_telement_size)

Create an array with fixed sized elements.

Parameters:

max_elements initial max elements.
element_size size of each element.

Returns:

array instance.

qb_array_t* qb_array_create_2 (size_tmax_elements, size_telement_size, size_tautogrow_elements)

Create an array with fixed sized elements.

Parameters:

max_elements initial max elements.
element_size size of each element.
autogrow_elements the number of elements to grow automatically by.

Returns:

array instance.

size_t qb_array_elems_per_bin_get (qb_array_t *a)

Get the number of elements per bin.

void qb_array_free (qb_array_t *a)

Free all the memory used by the array.

Parameters:

a array instance.

int32_t qb_array_grow (qb_array_t *a, size_tmax_elements)

Grow the array.

Parameters:

a array instance.
max_elements the new maximum size of the array.

Returns:

(0 == success, else -errno)

int32_t qb_array_index (qb_array_t *a, int32_tidx, void **element_out)

Get an element at a particular index.

Parameters:

a array instance.
idx the index
element_out the pointer to the element data.

Returns:

(0 == success, else -errno)

int32_t qb_array_new_bin_cb_set (qb_array_t *a, qb_array_new_bin_cb_fnfn)

Get a callback when a new bin is allocated.

size_t qb_array_num_bins_get (qb_array_t *a)

Get the number of bins used or the array.

Author

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Wed Apr 1 2020 Version 1.0.1