[vJASS] Variable in struct

[Pinzu]

if my structs contains a variable with an array, does every element have to be set to 0 for me to be able to increase it?

Is this required:

method init_bTypeCount takes nothing returns nothing
            local integer i = 1
            loop
                exitwhen i == MAX_BUILDING_TYPES
                set .bTypeCount[i] = 0
                set i = i + 1
            endloop
        endmethod

to use this method:

method inc_bTypeCount takes integer index returns nothing 
            set .bTypeCount[index] = .bTypeCount[index] + 1
        endmethod

 

[edo494]

all arrays are default-initialized in Jass, so no, they will contain 0 even without your init

 

[Pinzu]

all arrays are default-initialized in Jass, so no, they will contain 0 even without your init

Okey thanks!

 

[Dr Super Good]

all arrays are default-initialized in Jass, so no, they will contain 0 even without your init

Except if he ever de-allocates struct instances which are then recycled. In that case they will contain what ever garbage value they had when they were de-allocated.

For this reason ever time you use a new struct instance you should initialize all member variables to some value. This also applies to C++ and C since memory allocation may return non-zeroed memory.

Do note that struct arrays divide maximum instance account. For example if you have structs with 1024 sized array members then you can have only 8 instances without occurring the penalties needed for chaining arrays.

 

[edo494]

well that is correct, but you should write default values into your member variables either in destroy or create methods regardless, so I just jumped into that assumption.

C has calloc which will return you zero-initialized values.

Also C and C++ allocation is a lot different thing than Jass allocation, since in Jass you never physically allocate anything(excluding dynamicness of arrays, since that is not really your intention)