Array initialization in bsp.c

Question

In the file bsp.c (from the SDK11 ble_hrs example) I don't quite understand the initialization statement: 
 static bsp_button_event_cfg_t m_events_list[BUTTONS_NUMBER] = {{BSP_EVENT_NOTHING, BSP_EVENT_NOTHING}};
 
 bsp_button_event_cfg_t is a struct with three fields, so what does this initialization do?

Roger Clark · Accepted Answer

Admittedly I had to compile this to double check, but... 
 But if you compile that code under gcc it initializes the first element of the array (which is a struct bsp_button_event_cfg_t ) 
 With values 
 push_event=BSP_EVENT_NOTHING;
long_push_event=BSP_EVENT_NOTHING;
 
 The other property of the struct ( release_event ) does not get initialized, and on gcc its value is zero (which is the same as the enum for BSP_EVENT_NOTHING, but thats partially coincidental. 
 Also only the first element of the array gets initialized; which is a bit of a concern, considering BUTTONS_NUMBER is defined in the header file for the board in question, and seems to have possible values of 0 2,3,4 or 8 depending on which board you have. 
 I think the only reason this code actually works, is that the enum for BSP_EVENT_NOTHING is defined as 0, and the C compiler initializes static variables to zero which is the same as BSP_EVENT_NOTHING. 
 e.g. If you had a board that had 8 buttons, and BSP_EVENT_NOTHING was defined to 1, instead of zero, it would most likely not work. 
 I think the code should really be updated to remove the initialization, which is misleading and incorrect for any board that has more than 1 button. 
 static bsp_button_event_cfg_t m_events_list[3];