Data Structures | Functions
Generic Value management

Data Structures

struct  _Eina_Value
 defines the contents of a value More...
 

Functions

Eina_Valueeina_value_new (const Eina_Value_Type *type)
 Creates generic value storage. More...
 
void eina_value_free (Eina_Value *value)
 Frees value and its data. More...
 
static Eina_Bool eina_value_setup (Eina_Value *value, const Eina_Value_Type *type)
 Initializes generic value storage. More...
 
static void eina_value_flush (Eina_Value *value)
 Creates generic value storage. More...
 
Eina_Bool eina_value_copy (const Eina_Value *value, Eina_Value *copy)
 Copies generic value storage. More...
 
static int eina_value_compare (const Eina_Value *a, const Eina_Value *b)
 Compares generic value storage. More...
 
static Eina_Bool eina_value_set (Eina_Value *value,...)
 Sets the generic value. More...
 
static Eina_Bool eina_value_get (const Eina_Value *value,...)
 Gets the generic value. More...
 
static Eina_Bool eina_value_vset (Eina_Value *value, va_list args)
 Sets the generic value. More...
 
static Eina_Bool eina_value_vget (const Eina_Value *value, va_list args)
 Gets the generic value. More...
 
static Eina_Bool eina_value_pset (Eina_Value *value, const void *ptr)
 Sets the generic value from pointer. More...
 
static Eina_Bool eina_value_pget (const Eina_Value *value, void *ptr)
 Gets the generic value to pointer. More...
 
Eina_Bool eina_value_convert (const Eina_Value *value, Eina_Value *convert)
 Converts one value to another type. More...
 
char * eina_value_to_string (const Eina_Value *value)
 Converts value to string. More...
 
static const Eina_Value_Typeeina_value_type_get (const Eina_Value *value)
 Queries value type. More...
 

Detailed Description

Function Documentation

◆ eina_value_new()

Eina_Value* eina_value_new ( const Eina_Value_Type type)

Creates generic value storage.

Parameters
typeHow to manage this value.
Returns
The new value or NULL on failure.

Create a new generic value storage. The members are managed using the description specified by type.

Some types may specify more operations: eg. EINA_VALUE_TYPE_ARRAY uses eina_value_array_set(), eina_value_array_get() and so on.

On failure, NULL is returned.

Note
This calls creates from mempool and then uses eina_value_setup(). Consider using eina_value_flush() and eina_value_setup() instead to avoid memory allocations.
See also
eina_value_free()
Since
1.2

References eina_mempool_free(), eina_mempool_malloc(), and eina_value_setup().

Referenced by eina_value_util_time_string_new(), and elm_config_web_backend_get().

◆ eina_value_free()

void eina_value_free ( Eina_Value value)

Frees value and its data.

Parameters
valuevalue object
See also
eina_value_flush()
Since
1.2

References eina_mempool_free(), and eina_value_flush().

Referenced by elm_config_web_backend_get(), efl::eina::value::value(), and efl::eina::value::~value().

◆ eina_value_setup()

static Eina_Bool eina_value_setup ( Eina_Value value,
const Eina_Value_Type type 
)
inlinestatic

Initializes generic value storage.

Parameters
valueValue object
typeHow to manage this value.
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

Initializes existing generic value storage. The members are managed using the description specified by type.

Some types may specify more operations, as an example EINA_VALUE_TYPE_ARRAY uses eina_value_array_set(), eina_value_array_get() and so on.

Note
Existing contents are ignored! If the value was previously used, then use eina_value_flush() first.

On failure, EINA_FALSE is returned.

See also
eina_value_flush()
Since
1.2
Examples:
eina_value_01.c, and eina_value_03.c.

Referenced by eina_value_new(), elm_fileselector_entry_path_get(), and elm_layout_content_swallow_list_get().

◆ eina_value_flush()

static void eina_value_flush ( Eina_Value value)
inlinestatic

Creates generic value storage.

Parameters
valueValue object

Releases all the resources associated with an Eina_Value. The value must be already set with eina_value_setup() or eina_value_new().

After this call returns, the contents of the value are undefined, but the value can be reused by calling eina_value_setup() again.

See also
eina_value_setup()
eina_value_free()
Since
1.2
Examples:
complex-types-client-eina-value.c, eina_value_01.c, and eina_value_03.c.

Referenced by efl_dbg_info_free(), eina_value_free(), elm_fileselector_entry_path_get(), and elm_layout_content_swallow_list_get().

◆ eina_value_copy()

Eina_Bool eina_value_copy ( const Eina_Value value,
Eina_Value copy 
)

Copies generic value storage.

Parameters
valueSource value object
copyDestination value object
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

The copy object is considered uninitialized and its existing contents are overwritten (just as if eina_value_flush() was called on it).

The copy happens by calling eina_value_setup() on copy, followed by getting the contents of value and setting it to copy.

Since
1.2

Referenced by efl_dbg_info_free(), and efl::eina::value::value().

◆ eina_value_compare()

static int eina_value_compare ( const Eina_Value a,
const Eina_Value b 
)
inlinestatic

Compares generic value storage.

Parameters
aleft side of comparison
bright side of comparison
Returns
less than zero if a < b, greater than zero if a > b, zero if a == b
Since
1.2

Referenced by efl::eina::operator<(), efl::eina::operator==(), and efl::eina::operator>().

◆ eina_value_set()

static Eina_Bool eina_value_set ( Eina_Value value,
  ... 
)
inlinestatic

Sets the generic value.

Parameters
valueSource value object
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

The variable argument is dependent on chosen type. The list for basic types:

  • EINA_VALUE_TYPE_UCHAR: unsigned char
  • EINA_VALUE_TYPE_USHORT: unsigned short
  • EINA_VALUE_TYPE_UINT: unsigned int
  • EINA_VALUE_TYPE_ULONG: unsigned long
  • EINA_VALUE_TYPE_UINT64: uint64_t
  • EINA_VALUE_TYPE_CHAR: char
  • EINA_VALUE_TYPE_SHORT: short
  • EINA_VALUE_TYPE_INT: int
  • EINA_VALUE_TYPE_LONG: long
  • EINA_VALUE_TYPE_INT64: int64_t
  • EINA_VALUE_TYPE_FLOAT: float
  • EINA_VALUE_TYPE_DOUBLE: double
  • EINA_VALUE_TYPE_STRINGSHARE: const char *
  • EINA_VALUE_TYPE_STRING: const char *
  • EINA_VALUE_TYPE_ARRAY: Eina_Value_Array
  • EINA_VALUE_TYPE_LIST: Eina_Value_List
  • EINA_VALUE_TYPE_HASH: Eina_Value_Hash
  • EINA_VALUE_TYPE_TIMEVAL: struct timeval
  • EINA_VALUE_TYPE_BLOB: Eina_Value_Blob
  • EINA_VALUE_TYPE_STRUCT: Eina_Value_Struct
Note
for array member see eina_value_array_set()
for list member see eina_value_list_set()
for hash member see eina_value_hash_set()
See also
eina_value_get()
eina_value_vset()
eina_value_pset()
Since
1.2
Examples:
eina_value_01.c, and eina_value_03.c.

Referenced by eina_value_util_time_string_new(), elm_fileselector_entry_path_get(), and elm_layout_content_swallow_list_get().

◆ eina_value_get()

static Eina_Bool eina_value_get ( const Eina_Value value,
  ... 
)
inlinestatic

Gets the generic value.

Parameters
valueSource value object
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

The value is returned in the variable argument parameter, the actual value is type-dependent, but usually it will be what is stored inside the object. There shouldn't be any memory allocation, thus the contents should not be freed.

The variable argument is dependent on chosen type. The list for basic types:

  • EINA_VALUE_TYPE_UCHAR: unsigned char*
  • EINA_VALUE_TYPE_USHORT: unsigned short*
  • EINA_VALUE_TYPE_UINT: unsigned int*
  • EINA_VALUE_TYPE_ULONG: unsigned long*
  • EINA_VALUE_TYPE_UINT64: uint64_t*
  • EINA_VALUE_TYPE_CHAR: char*
  • EINA_VALUE_TYPE_SHORT: short*
  • EINA_VALUE_TYPE_INT: int*
  • EINA_VALUE_TYPE_LONG: long*
  • EINA_VALUE_TYPE_INT64: int64_t*
  • EINA_VALUE_TYPE_FLOAT: float*
  • EINA_VALUE_TYPE_DOUBLE: double*
  • EINA_VALUE_TYPE_STRINGSHARE: const char **
  • EINA_VALUE_TYPE_STRING: const char **
  • EINA_VALUE_TYPE_ARRAY: Eina_Value_Array*
  • EINA_VALUE_TYPE_LIST: Eina_Value_List*
  • EINA_VALUE_TYPE_HASH: Eina_Value_Hash*
  • EINA_VALUE_TYPE_TIMEVAL: struct timeval*
  • EINA_VALUE_TYPE_BLOB: Eina_Value_Blob*
  • EINA_VALUE_TYPE_STRUCT: Eina_Value_Struct*
int x;
const char *s;
eina_value_set(value, 1234);
eina_value_get(value, &x);
eina_value_set(value, "hello world!");
eina_value_get(value, &s);
Note
for array member see eina_value_array_get()
for list member see eina_value_list_get()
for hash member see eina_value_hash_get()
See also
eina_value_set()
eina_value_vset()
eina_value_pset()
Since
1.2
Examples:
complex-types-client-eina-value.c, and eina_value_01.c.

Referenced by elm_config_web_backend_get(), elm_fileselector_entry_path_set(), and elm_prefs_data_version_get().

◆ eina_value_vset()

static Eina_Bool eina_value_vset ( Eina_Value value,
va_list  args 
)
inlinestatic

Sets the generic value.

Parameters
valueSource value object
argsVariable argument
Returns
EINA_TRUE on success, EINA_FALSE otherwise.
Note
for array member see eina_value_array_vset()
for list member see eina_value_list_vset()
for hash member see eina_value_hash_vset()
See also
eina_value_vget()
eina_value_set()
eina_value_pset()
Since
1.2

◆ eina_value_vget()

static Eina_Bool eina_value_vget ( const Eina_Value value,
va_list  args 
)
inlinestatic

Gets the generic value.

Parameters
valueSource value object
argsVariable argument
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

The value is returned in the variable argument parameter, the actual value is type-dependent, but usually it will be what is stored inside the object. There shouldn't be any memory allocation, thus the contents should not be freed.

Note
for array member see eina_value_array_vget()
for list member see eina_value_list_vget()
for hash member see eina_value_hash_vget()
See also
eina_value_vset()
eina_value_get()
eina_value_pget()
Since
1.2

◆ eina_value_pset()

static Eina_Bool eina_value_pset ( Eina_Value value,
const void *  ptr 
)
inlinestatic

Sets the generic value from pointer.

Parameters
valueSource value object
ptrPointer to specify the contents.
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

The pointer type is dependent on chosen value type. The list for basic types:

  • EINA_VALUE_TYPE_UCHAR: unsigned char*
  • EINA_VALUE_TYPE_USHORT: unsigned short*
  • EINA_VALUE_TYPE_UINT: unsigned int*
  • EINA_VALUE_TYPE_ULONG: unsigned long*
  • EINA_VALUE_TYPE_UINT64: uint64_t*
  • EINA_VALUE_TYPE_CHAR: char*
  • EINA_VALUE_TYPE_SHORT: short*
  • EINA_VALUE_TYPE_INT: int*
  • EINA_VALUE_TYPE_LONG: long*
  • EINA_VALUE_TYPE_INT64: int64_t*
  • EINA_VALUE_TYPE_FLOAT: float*
  • EINA_VALUE_TYPE_DOUBLE: double*
  • EINA_VALUE_TYPE_STRINGSHARE: const char **
  • EINA_VALUE_TYPE_STRING: const char **
  • EINA_VALUE_TYPE_ARRAY: Eina_Value_Array*
  • EINA_VALUE_TYPE_LIST: Eina_Value_List*
  • EINA_VALUE_TYPE_HASH: Eina_Value_Hash*
  • EINA_VALUE_TYPE_TIMEVAL: struct timeval*
  • EINA_VALUE_TYPE_BLOB: Eina_Value_Blob*
  • EINA_VALUE_TYPE_STRUCT: Eina_Value_Struct*
Note
the pointer contents are written using the size defined by type. It can be larger than void* or uint64_t.
int x = 567;
const char *s = "hello world!";
eina_value_pset(value, &x);
eina_value_pset(value, &s);
Note
for array member see eina_value_array_pset()
for list member see eina_value_list_pset()
for hash member see eina_value_hash_pset()
See also
eina_value_pget()
eina_value_set()
eina_value_vset()
Since
1.2

◆ eina_value_pget()

static Eina_Bool eina_value_pget ( const Eina_Value value,
void *  ptr 
)
inlinestatic

Gets the generic value to pointer.

Parameters
valueSource value object
ptrPointer to receive the contents.
Returns
EINA_TRUE on success, EINA_FALSE otherwise.

The value is returned in pointer contents, the actual value is type-dependent, but usually it will be what is stored inside the object. There shouldn't be any memory allocation, thus the contents should not be freed.

The pointer type is dependent on chosen value type. The list for basic types:

  • EINA_VALUE_TYPE_UCHAR: unsigned char*
  • EINA_VALUE_TYPE_USHORT: unsigned short*
  • EINA_VALUE_TYPE_UINT: unsigned int*
  • EINA_VALUE_TYPE_ULONG: unsigned long*
  • EINA_VALUE_TYPE_UINT64: uint64_t*
  • EINA_VALUE_TYPE_CHAR: char*
  • EINA_VALUE_TYPE_SHORT: short*
  • EINA_VALUE_TYPE_INT: int*
  • EINA_VALUE_TYPE_LONG: long*
  • EINA_VALUE_TYPE_INT64: int64_t*
  • EINA_VALUE_TYPE_FLOAT: float*
  • EINA_VALUE_TYPE_DOUBLE: double*
  • EINA_VALUE_TYPE_STRINGSHARE: const char **
  • EINA_VALUE_TYPE_STRING: const char **
  • EINA_VALUE_TYPE_ARRAY: Eina_Value_Array*
  • EINA_VALUE_TYPE_LIST: Eina_Value_List*
  • EINA_VALUE_TYPE_HASH: Eina_Value_Hash*
  • EINA_VALUE_TYPE_TIMEVAL: struct timeval*
  • EINA_VALUE_TYPE_BLOB: Eina_Value_Blob*
  • EINA_VALUE_TYPE_BLOB: Eina_Value_Blob*
int x;
const char *s;
eina_value_set(value, 1234);
eina_value_pget(value, &x);
eina_value_set(value, "hello world!");
eina_value_pget(value, &s);
Note
for array member see eina_value_array_get()
for list member see eina_value_list_get()
for hash member see eina_value_hash_get()
See also
eina_value_set()
eina_value_vset()
eina_value_pset()
Since
1.2

◆ eina_value_convert()

Eina_Bool eina_value_convert ( const Eina_Value value,
Eina_Value convert 
)

Converts one value to another type.

Parameters
valueSource value object.
convertDestination value object.
Returns
EINA_TRUE if converted, EINA_FALSE otherwise.

Converts one value to another trying first value type convert_to() function. If unsuccessful, tries using convert_from() function in convert.

Conversion functions are type defined, and the basic types can convert between themselves, but conversion is strict! That is, if converting from negative value to unsigned type, it will fail. It also fails on value overflow.

It is recommended that all types implement at least convert to string, used by eina_value_to_string().

Note
Both objects must have eina_value_setup() called on them beforehand!
Since
1.2

References EINA_FALSE.

Referenced by elm_config_web_backend_get().

◆ eina_value_to_string()

char* eina_value_to_string ( const Eina_Value value)

Converts value to string.

Parameters
valuevalue object.
Returns
newly allocated memory or NULL on failure.
See also
eina_value_convert()
Since
1.2

Referenced by efl_dbg_info_free().

◆ eina_value_type_get()

static const Eina_Value_Type* eina_value_type_get ( const Eina_Value value)
inlinestatic

Queries value type.

Parameters
valueValue object.
Returns
Type instance, or NULL if type is invalid.

Check if value type is valid and returns it. A type is invalid if it does not exist or if it is using a different version field.

See also
eina_value_type_check()
Since
1.2

Referenced by elm_config_web_backend_get(), elm_prefs_data_version_get(), and efl::eina::value_view::type_info().