vt_init_elem 7 | 2016-02-28 | genvector manual |
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vt_init_elem - optional element initialization callback
#define GVT_INIT_ELEM_FUNC
void (*init_elem)(GVTTYPE *vect, GVT_ELEM_TYPE *elem);
When macro GVT_INIT_ELEM_FUNC is defined during vt_instantiation(7), genvector adds an init_elem callback function field to the vector structure. The caller should fill in this function pointer before or after the vector initialization.Whenever a new element enters the vector, if init_elem is enabled and is not NULL, it is called on the element.
The purpose of this feature is to provide a simple mechanism through which the user can set the initial value of new/uninitialized elements in a flexible way (e.g. UUID field in a struct element).
While this mechanism works together with vt_construction(7), they are usually not enabled in the same time.
A much simpler alternative is vt_set_new_bytes_to(7).
vt_init_elem 7 | 2016-02-28 | genvector manual |
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