template.h File Reference

#include <derive-c/core/includes/def.h>
#include "includes.h"
#include <derive-c/core/alloc/def.h>
#include <derive-c/core/self/def.h>
#include <derive-c/core/self/undef.h>
#include <derive-c/core/alloc/undef.h>
#include <derive-c/core/includes/undef.h>

Go to the source code of this file.

Data Structures
struct	item_t
	A queue comprised of an extendable circular buffer. More...
struct	SELF
	An allocator that prints to stdout when it allocates or frees memory. More...
struct	ITER
struct	ITER_CONST

Macros
#define	ITEM   item_t
#define	ITEM_DELETE   item_delete
#define	ITEM_CLONE   item_clone
#define	ITEM_DEBUG   item_debug
#define	INVARIANT_CHECK(self)
#define	ITER   NS(SELF, iter)
#define	ITER_CONST   NS(SELF, iter_const)

Typedefs
typedef size_t	index_t
typedef ITEM *	item

Functions
static void	ITEM_DELETE (item_t *)
static item_t	ITEM_CLONE (item_t const *self)
static void	ITEM_DEBUG (ITEM const *, dc_debug_fmt, FILE *)
static DC_PUBLIC SELF	new (ref alloc_ref)
static DC_PUBLIC SELF	new_with_capacity (size_t capacity, ref alloc_ref)
static DC_PUBLIC SELF	new_with_defaults (size_t size, ITEM default_item, ref alloc_ref)
static DC_PUBLIC void	reserve (SELF *self, size_t new_capacity)
static DC_PUBLIC SELF	clone (SELF const *self)
static DC_PUBLIC ITEM const *	try_read (SELF const *self, size_t index)
static DC_PUBLIC ITEM const *	read (SELF const *self, size_t index)
static DC_PUBLIC ITEM *	try_write (SELF *self, size_t index)
static DC_PUBLIC ITEM *	write (SELF *self, size_t index)
static DC_PUBLIC ITEM *	try_insert_at (SELF *self, size_t at, ITEM const *items, size_t count)
static DC_PUBLIC void	remove_at (SELF *self, size_t at, size_t count)
static DC_PUBLIC ITEM *	try_push (SELF *self, ITEM item)
static DC_PUBLIC ITEM *	push (SELF *self, ITEM item)
static DC_PUBLIC bool	try_pop (SELF *self, ITEM *destination)
static DC_PUBLIC ITEM *	data (SELF *self)
static DC_PUBLIC ITEM	pop (SELF *self)
static DC_PUBLIC ITEM	pop_front (SELF *self)
static DC_PUBLIC size_t	size (SELF const *self)
static DC_PUBLIC void	delete (SELF *self)
static DC_PUBLIC void	transfer_reverse (SELF *source, SELF *target, size_t to_move)
static DC_PUBLIC DC_INLINE bool	empty_item (ITEM *const *item)
static DC_PUBLIC DC_INLINE ITEM *	next (ITER *DC_RESTRICT iter)
static DC_PUBLIC DC_INLINE size_t	position (ITER const *DC_RESTRICT iter)
static DC_PUBLIC DC_INLINE bool	empty (ITER const *DC_RESTRICT iter)
static DC_PUBLIC DC_INLINE ITER	get_iter (SELF *self)
static DC_PUBLIC DC_INLINE bool	empty_item (ITEM const *const *item)
static DC_PUBLIC DC_INLINE ITEM const *	next (ITER_CONST *DC_RESTRICT iter)
static DC_PUBLIC DC_INLINE size_t	position (ITER_CONST const *DC_RESTRICT iter)
static DC_PUBLIC DC_INLINE bool	empty (ITER_CONST const *DC_RESTRICT iter)
static DC_PUBLIC DC_INLINE ITER_CONST	get_iter_const (SELF const *self)
static DC_PUBLIC void	debug (SELF const *self, dc_debug_fmt fmt, FILE *stream)
	DC_TRAIT_VECTOR (SELF)

Variables
DC_STATIC_CONSTANT size_t	max_size = SIZE_MAX

Macro Definition Documentation

INVARIANT_CHECK

#define INVARIANT_CHECK

(

self

)

Value:

    DC_ASSUME(self);                                                                               \
    DC_ASSUME((self)->size <= (self)->capacity);                                                   \
    DC_ASSUME(DC_WHEN(!((self)->data), (self)->capacity == 0 && (self)->size == 0));

Definition at line 51 of file template.h.

#define INVARIANT_CHECK(self)                                                                      \
    DC_ASSUME(self);                                                                               \
    DC_ASSUME((self)->size <= (self)->capacity);                                                   \
    DC_ASSUME(DC_WHEN(!((self)->data), (self)->capacity == 0 && (self)->size == 0));

ITEM

#define ITEM   item_t

Definition at line 18 of file template.h.

ITEM_CLONE

#define ITEM_CLONE   item_clone

Definition at line 21 of file template.h.

ITEM_DEBUG

#define ITEM_DEBUG   item_debug

Definition at line 23 of file template.h.

ITEM_DELETE

#define ITEM_DELETE   item_delete

Definition at line 19 of file template.h.

ITER

#define ITER   NS(SELF, iter)

Definition at line 370 of file template.h.

ITER_CONST

#define ITER_CONST   NS(SELF, iter_const)

Definition at line 417 of file template.h.

Typedef Documentation

index_t

typedef size_t index_t

Definition at line 39 of file template.h.

item

typedef ITEM const* item

Definition at line 371 of file template.h.

Function Documentation

clone()

DC_PUBLIC SELF clone ( SELF const * self )

static

Definition at line 141 of file template.h.

                                                        {
    INVARIANT_CHECK(self);
    ITEM* data = (ITEM*)NS(ALLOC, allocate_uninit)(self->alloc_ref, self->capacity * sizeof(ITEM));
 
    for (size_t index = 0; index < self->size; index++) {
        data[index] = ITEM_CLONE(&self->data[index]);
    }
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                          &data[self->size], (self->capacity - self->size) * sizeof(ITEM));
    return (SELF){
        .size = self->size,
        .capacity = self->capacity,
        .data = data,
        .alloc_ref = self->alloc_ref,
        .derive_c_vector_marker = dc_gdb_marker_new(),
        .iterator_invalidation_tracker = mutation_tracker_new(),
    };
}

data()

DC_PUBLIC ITEM * data ( SELF * self )

static

Examples

complex/employees.c.

Definition at line 284 of file template.h.

                                                  {
    INVARIANT_CHECK(self);
    return self->data;
}

DC_TRAIT_VECTOR()

DC_TRAIT_VECTOR

(

SELF

)

debug()

DC_PUBLIC void debug ( SELF const * self, dc_debug_fmt fmt, FILE * stream )

static

Definition at line 464 of file template.h.

                                                                                        {
    fprintf(stream, DC_EXPAND_STRING(SELF) "@%p {\n", (void*)self);
    fmt = dc_debug_fmt_scope_begin(fmt);
    dc_debug_fmt_print(fmt, stream, "size: %lu,\n", self->size);
    dc_debug_fmt_print(fmt, stream, "capacity: %lu,\n", self->capacity);
 
    dc_debug_fmt_print(fmt, stream, "alloc: ");
    NS(ALLOC, debug)(NS(NS(ALLOC, ref), deref)(self->alloc_ref), fmt, stream);
    fprintf(stream, ",\n");
 
    dc_debug_fmt_print(fmt, stream, "items: @%p [\n", (void*)self->data);
    fmt = dc_debug_fmt_scope_begin(fmt);
 
    ITER_CONST iter = NS(SELF, get_iter_const)(self);
    ITEM const* item;
    while ((item = NS(ITER_CONST, next)(&iter))) {
        dc_debug_fmt_print_indents(fmt, stream);
        ITEM_DEBUG(item, fmt, stream);
        fprintf(stream, ",\n");
    }
    fmt = dc_debug_fmt_scope_end(fmt);
    dc_debug_fmt_print(fmt, stream, "],\n");
    fmt = dc_debug_fmt_scope_end(fmt);
    dc_debug_fmt_print(fmt, stream, "}");
}

delete()

DC_PUBLIC void delete ( SELF * self )

static

Definition at line 313 of file template.h.

                                                   {
    INVARIANT_CHECK(self);
    if (self->data) {
        for (size_t i = 0; i < self->size; i++) {
            ITEM_DELETE(&self->data[i]);
            // JUSTIFY: Setting items as inaccessible
            //  - Incase a destructor of one item accesses the memory of another.
            dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                                  &self->data[i], sizeof(ITEM));
        }
 
        // JUSTIFY: Return to write level before passing to allocator
        //  - Is uninitialised, but still valid memory
        size_t const size = self->capacity * sizeof(ITEM);
        dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_WRITE,
                              self->data, size);
        NS(ALLOC, deallocate)(self->alloc_ref, self->data, size);
    }
}

empty() [1/2]

DC_PUBLIC DC_INLINE bool empty ( ITER const *DC_RESTRICT iter )

static

Definition at line 400 of file template.h.

                                                                              {
    DC_ASSUME(iter);
    mutation_version_check(&iter->version);
    return iter->pos >= iter->size;
}

empty() [2/2]

DC_PUBLIC DC_INLINE bool empty ( ITER_CONST const *DC_RESTRICT iter )

static

Definition at line 448 of file template.h.

                                                                                          {
    DC_ASSUME(iter);
    mutation_version_check(&iter->vec_version);
    return iter->pos >= iter->size;
}

empty_item() [1/2]

DC_PUBLIC DC_INLINE bool empty_item ( ITEM *const * item )

static

Definition at line 373 of file template.h.

{ return *item == NULL; }

empty_item() [2/2]

DC_PUBLIC DC_INLINE bool empty_item ( ITEM const *const * item )

static

Definition at line 420 of file template.h.

                                                                                    {
    return *item == NULL;
}

get_iter()

DC_PUBLIC DC_INLINE ITER get_iter ( SELF * self )

static

Definition at line 406 of file template.h.

                                                               {
    DC_ASSUME(self);
    return (ITER){
        .data = self->data,
        .pos = 0,
        .size = self->size,
        .version = mutation_tracker_get(&self->iterator_invalidation_tracker),
    };
}

get_iter_const()

DC_PUBLIC DC_INLINE ITER_CONST get_iter_const ( SELF const * self )

static

Definition at line 454 of file template.h.

                                                                                 {
    DC_ASSUME(self);
    return (ITER_CONST){
        .data = self->data,
        .pos = 0,
        .size = self->size,
        .vec_version = mutation_tracker_get(&self->iterator_invalidation_tracker),
    };
}

ITEM_CLONE()

item_t ITEM_CLONE ( item_t const * self )

static

Definition at line 22 of file template.h.

{ return *self; }

ITEM_DEBUG()

void ITEM_DEBUG ( ITEM const * , dc_debug_fmt , FILE *  )

static

Definition at line 24 of file template.h.

{}

ITEM_DELETE()

void ITEM_DELETE ( item_t * )

static

Definition at line 20 of file template.h.

{}

new()

DC_PUBLIC SELF new ( ref alloc_ref )

static

Definition at line 58 of file template.h.

                                                              {
    SELF self = (SELF){
        .size = 0,
        .capacity = 0,
        .data = NULL,
        .alloc_ref = alloc_ref,
        .derive_c_vector_marker = dc_gdb_marker_new(),
        .iterator_invalidation_tracker = mutation_tracker_new(),
    };
    return self;
}

new_with_capacity()

DC_PUBLIC SELF new_with_capacity ( size_t capacity, ref alloc_ref )

static

Definition at line 70 of file template.h.

                                                                                             {
    if (capacity == 0) {
        return NS(SELF, new)(alloc_ref);
    }
 
    ITEM* data = (ITEM*)NS(ALLOC, allocate_uninit)(alloc_ref, capacity * sizeof(ITEM));
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE, data,
                          capacity * sizeof(ITEM));
    return (SELF){
        .size = 0,
        .capacity = capacity,
        .data = data,
        .alloc_ref = alloc_ref,
        .derive_c_vector_marker = dc_gdb_marker_new(),
        .iterator_invalidation_tracker = mutation_tracker_new(),
    };
}

new_with_defaults()

DC_PUBLIC SELF new_with_defaults ( size_t size, ITEM default_item, ref alloc_ref )

static

Definition at line 88 of file template.h.

                                                                            {
    ITEM* data = (ITEM*)NS(ALLOC, allocate_uninit)(alloc_ref, size * sizeof(ITEM));
    if (size > 0) {
        // JUSTIFY: We only need to copy size-1 entries - can move the first as default.
        data[0] = default_item;
        for (size_t i = 1; i < size; i++) {
            data[i] = ITEM_CLONE(&default_item);
        }
    }
    return (SELF){
        .size = size,
        .capacity = size,
        .data = data,
        .alloc_ref = alloc_ref,
        .derive_c_vector_marker = dc_gdb_marker_new(),
        .iterator_invalidation_tracker = mutation_tracker_new(),
    };
}

next() [1/2]

DC_PUBLIC DC_INLINE ITEM * next ( ITER *DC_RESTRICT iter )

static

Definition at line 382 of file template.h.

                                                                        {
    DC_ASSUME(iter);
    mutation_version_check(&iter->version);
 
    if (iter->pos < iter->size) {
        ITEM* item = &iter->data[iter->pos];
        iter->pos++;
        return item;
    }
    return NULL;
}

next() [2/2]

DC_PUBLIC DC_INLINE ITEM const * next ( ITER_CONST *DC_RESTRICT iter )

static

Definition at line 431 of file template.h.

                                                                                          {
    DC_ASSUME(iter);
    mutation_version_check(&iter->vec_version);
    if (iter->pos < iter->size) {
        ITEM const* item = &iter->data[iter->pos];
        iter->pos++;
        return item;
    }
    return NULL;
}

pop()

DC_PUBLIC ITEM pop ( SELF * self )

static

Definition at line 289 of file template.h.

                                                {
    ITEM entry;
    DC_ASSERT(NS(SELF, try_pop)(self, &entry), "Cannot pop, already empty {size=%lu}",
              (size_t)self->size);
    return entry;
}

pop_front()

DC_PUBLIC ITEM pop_front ( SELF * self )

static

Definition at line 296 of file template.h.

                                                      {
    INVARIANT_CHECK(self);
    mutation_tracker_mutate(&self->iterator_invalidation_tracker);
    DC_ASSERT(self->size > 0, "Cannot pop front, already empty {size=%lu}", (size_t)self->size);
    ITEM entry = self->data[0];
    memmove(&self->data[0], &self->data[1], (self->size - 1) * sizeof(ITEM));
    self->size--;
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                          &self->data[self->size], sizeof(ITEM));
    return entry;
}

position() [1/2]

DC_PUBLIC DC_INLINE size_t position ( ITER const *DC_RESTRICT iter )

static

Definition at line 394 of file template.h.

                                                                                   {
    DC_ASSUME(iter);
    mutation_version_check(&iter->version);
    return iter->pos;
}

position() [2/2]

DC_PUBLIC DC_INLINE size_t position ( ITER_CONST const *DC_RESTRICT iter )

static

Definition at line 442 of file template.h.

                                                                                               {
    DC_ASSUME(iter);
    mutation_version_check(&iter->vec_version);
    return iter->pos;
}

push()

DC_PUBLIC ITEM * push ( SELF * self, ITEM item )

static

Definition at line 263 of file template.h.

                                                             {
    ITEM* entry = NS(SELF, try_push)(self, item);
    DC_ASSERT(entry != NULL, "Cannot push, already at max capacity {capacity=%lu, item=%s}",
              (size_t)self->capacity, DC_DEBUG(ITEM_DEBUG, &item));
    return entry;
}

read()

DC_PUBLIC ITEM const * read ( SELF const * self, size_t index )

static

Definition at line 168 of file template.h.

                                                                            {
    ITEM const* item = NS(SELF, try_read)(self, index);
    DC_ASSERT(item, "Cannot read, index out of bounds {index=%lu, size=%lu}", (size_t)index,
              (size_t)self->size);
    return item;
}

remove_at()

DC_PUBLIC void remove_at ( SELF * self, size_t at, size_t count )

static

Definition at line 211 of file template.h.

                                                                               {
    INVARIANT_CHECK(self);
    DC_ASSERT(at + count <= self->size,
              "Cannot remove at, index out of bounds {at=%lu, count=%lu, size=%lu}", (size_t)at,
              (size_t)count, (size_t)self->size);
    mutation_tracker_mutate(&self->iterator_invalidation_tracker);
 
    if (count == 0) {
        return;
    }
 
    for (size_t i = at; i < at + count; i++) {
        ITEM_DELETE(&self->data[i]);
    }
 
    memmove(&self->data[at], &self->data[at + count], (self->size - (at + count)) * sizeof(ITEM));
    self->size -= count;
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                          &self->data[self->size], count * sizeof(ITEM));
}

reserve()

DC_PUBLIC void reserve ( SELF * self, size_t new_capacity )

static

Definition at line 108 of file template.h.

                                                                         {
    INVARIANT_CHECK(self);
    if (new_capacity > self->capacity) {
        if (self->data == NULL) {
            DC_ASSUME(self->capacity == 0);
 
            ITEM* new_data =
                (ITEM*)NS(ALLOC, allocate_uninit)(self->alloc_ref, new_capacity * sizeof(ITEM));
            self->data = new_data;
            self->capacity = new_capacity;
            dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_WRITE,
                                  self->data, self->capacity * sizeof(ITEM));
        } else {
            const size_t capacity_increase = new_capacity - self->capacity;
            const size_t uninit_elements = self->capacity - self->size;
 
            dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_WRITE,
                                  &self->data[self->size], uninit_elements * sizeof(ITEM));
 
            size_t old_size = self->capacity * sizeof(ITEM);
            size_t new_size = new_capacity * sizeof(ITEM);
            ITEM* new_data =
                (ITEM*)NS(ALLOC, reallocate)(self->alloc_ref, self->data, old_size, new_size);
 
            self->data = new_data;
            dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                                  &self->data[self->size],
                                  (uninit_elements + capacity_increase) * sizeof(ITEM));
            self->capacity = new_capacity;
        }
    }
}

size()

DC_PUBLIC size_t size ( SELF const * self )

static

Definition at line 308 of file template.h.

                                                         {
    INVARIANT_CHECK(self);
    return self->size;
}

transfer_reverse()

DC_PUBLIC void transfer_reverse ( SELF * source, SELF * target, size_t to_move )

static

Moves to_move items from the beginning of source, to the end of target, shuffling elements in source forward appropriately.

• Used for deque rebalancing

index:   0  1  2  3  4  5
source: [5, 4, 3, 2, 1, 0]
target: [6, 7, 8, 9]

Becomes:

index:   0  1  2  3  4  5
source: [3, 2, 1, 0]
target: [4, 5, 6, 7, 8, 9]

Definition at line 348 of file template.h.

                                                                                             {
    INVARIANT_CHECK(source);
    INVARIANT_CHECK(target);
 
    NS(SELF, reserve)(target, target->size + to_move);
 
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_WRITE,
                          &target->data[target->size], to_move * sizeof(ITEM));
    memmove(&target->data[to_move], target->data, target->size * sizeof(ITEM));
 
    for (size_t i = 0; i < to_move; i++) {
        target->data[to_move - 1 - i] = source->data[i];
    }
 
    memmove(source->data, &source->data[to_move], (source->size - to_move) * sizeof(ITEM));
 
    source->size -= to_move;
    target->size += to_move;
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                          &source->data[source->size], to_move * sizeof(ITEM));
}

try_insert_at()

DC_PUBLIC ITEM * try_insert_at ( SELF * self, size_t at, ITEM const * items, size_t count )

static

Definition at line 190 of file template.h.

                                                             {
    INVARIANT_CHECK(self);
    DC_ASSUME(items);
    DC_ASSERT(at <= self->size, "Cannot insert at, index out of bounds {at=%lu, size=%lu}",
              (size_t)at, (size_t)self->size);
    mutation_tracker_mutate(&self->iterator_invalidation_tracker);
 
    if (count == 0) {
        return NULL;
    }
 
    NS(SELF, reserve)(self, self->size + count);
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_WRITE,
                          &self->data[self->size], count * sizeof(ITEM));
    memmove(&self->data[at + count], &self->data[at], (self->size - at) * sizeof(ITEM));
    memcpy(&self->data[at], items, count * sizeof(ITEM));
    self->size += count;
    return &self->data[at];
}

try_pop()

DC_PUBLIC bool try_pop ( SELF * self, ITEM * destination )

static

Definition at line 270 of file template.h.

                                                                       {
    INVARIANT_CHECK(self);
    mutation_tracker_mutate(&self->iterator_invalidation_tracker);
 
    if (DC_LIKELY(self->size > 0)) {
        self->size--;
        *destination = self->data[self->size];
        dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_NONE,
                              &self->data[self->size], sizeof(ITEM));
        return true;
    }
    return false;
}

try_push()

DC_PUBLIC ITEM * try_push ( SELF * self, ITEM item )

static

Definition at line 232 of file template.h.

                                                                 {
    INVARIANT_CHECK(self);
    mutation_tracker_mutate(&self->iterator_invalidation_tracker);
 
    if (self->size == self->capacity) {
        size_t new_capacity;
        if (self->data == NULL) {
            DC_ASSUME(self->capacity == 0);
            // JUSTIFY: Allocating capacity of 4
            //           - Avoid repeat reallocations on growing a vector from
            //             size sero (from new)
            //           Otherwise an arbitrary choice (given we do not know the size of T)
            new_capacity = 8;
        } else {
            // JUSTIFY: Growth factor of 2
            //           - Simple arithmetic (for debugging)
            //           - Same as used by GCC's std::vector implementation
            new_capacity = self->capacity * 2;
        }
        NS(SELF, reserve)(self, new_capacity);
    }
 
    dc_memory_tracker_set(DC_MEMORY_TRACKER_LVL_CONTAINER, DC_MEMORY_TRACKER_CAP_WRITE,
                          &self->data[self->size], sizeof(ITEM));
 
    ITEM* entry = &self->data[self->size];
    *entry = item;
    self->size++;
    return entry;
}

try_read()

DC_PUBLIC ITEM const * try_read ( SELF const * self, size_t index )

static

Definition at line 160 of file template.h.

                                                                                {
    INVARIANT_CHECK(self);
    if (DC_LIKELY(index < self->size)) {
        return &self->data[index];
    }
    return NULL;
}

try_write()

DC_PUBLIC ITEM * try_write ( SELF * self, size_t index )

static

Definition at line 175 of file template.h.

                                                                     {
    INVARIANT_CHECK(self);
    if (DC_LIKELY(index < self->size)) {
        return &self->data[index];
    }
    return NULL;
}

write()

DC_PUBLIC ITEM * write ( SELF * self, size_t index )

static

Definition at line 183 of file template.h.

                                                                 {
    ITEM* item = NS(SELF, try_write)(self, index);
    DC_ASSERT(item, "Cannot write, index out of bounds {index=%lu, size=%lu}", (size_t)index,
              (size_t)self->size);
    return item;
}

Variable Documentation

max_size

DC_STATIC_CONSTANT size_t max_size = SIZE_MAX

Definition at line 56 of file template.h.