[General] different struct arrays

[gorillabull]

Hai
is there any difference when you:

1. Have a normal struct and create an array member of that struct like this:

struct A1
integer c 
endstruct
// 
globals
A1 array bla
endglobals
set bla[0].c = 0 
set bla[1].c = 55 
...

2. And create a struct that extends an array and use it:

struct ABC extends array 
integer c
endstruct 
//
globals

endglobals
set ABC [0].c = 1 
set ABC [1].c = 999

ive been getting some weird errors when using the first method like data being "shared" by members of different array struct types created from 1 struct so anyone know if these two are any different when the struct array is used as a global variable ?

 

[edo494]

I never saw something like that, and I think the second wouldnt even compile, but I cant say for sure because I never tried it.(Reason being that J is not in fact array, its simple integer as any other integer)

extends array only removes the custom allocate, deallocate, create, destroy methods and you have to declare all of them by ourself. Also extends array can be used if you dont want to instanciate your struct or want to make your own more complex or maybe lighter allocate method

Your problem with first example is that none of your instances are created, which means this for c with bla[0] is 0 and for bla[1] is also 0, you can test this by printing the struct instance using something like BJDebugMsg(I2S(bla[0]))

 

[gorillabull]

hehe yea i guess i might have some instances that are not initialized >.> also the extends array struct works fine as an array as long as you are accessing the original struct so i made a mistake there well thanx for clearing that out

 

[edo494]

oh yea, now it makes a lot more sence the thing you do differently in second then in first is that in first you are trying to use the same instance over and over again(always 0) and in the second example you are saying: set c for instance 0 to 0, set c for instance of 1 to 55, basically the array index is the instance number, which is not changing in first example because you didnt create the instances(either calling .allocate() inside, or .create() from utside, .allocate() is private)

 

[deathismyfriend]

using the struct extends array is better. the normal one creates a lot of extra code that is not needed.

 

[gorillabull]

mm yea good point

 

[Almia]

Uhh, where is the static method operator [] in the struct?

 

[edo494]

yea, you are right actually, in second example it should be BLA(index) not BLA[index]