foreach_meta

Calls func with user_data for each meta in this.

func can modify the passed meta pointer or its contents. The return value of func defines if this function returns or if the remaining metadata items in the buffer should be skipped.

Parameters:

this	a Buffer
func	a BufferForeachMetaFunc to call
user_data	user data passed to func

Returns:

false when func returned false for one of the metadata.