Function

Vipsslist_map4

Declaration [src] 

void*
vips_slist_map4 (
  GSList* list,
  VipsSListMap4Fn fn,
  void* a,
  void* b,
  void* c,
  void* d
)

Description [src]

Map over a slist. _copy() the list in case the callback changes it.

Parameters

list A list of guint8
 

A GSList
 The data is owned by the caller of the function.
fn VipsSListMap4Fn
 

Function to apply to each list element.
a void*
 

User data.
 The argument can be NULL.
 The data is owned by the caller of the function.
b void*
 

User data.
 The argument can be NULL.
 The data is owned by the caller of the function.
c void*
 

User data.
 The argument can be NULL.
 The data is owned by the caller of the function.
d void*
 

User data.
 The argument can be NULL.
 The data is owned by the caller of the function.

Return value

Returns: gpointer
 

NULL if fn returns NULL for all arguments, otherwise the first non-NULL value from fn.
 The data is owned by the called function.
 The return value can be NULL.