Solved why cant i access my struct?
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Hi, i got a struct like this:
typedef struct name{ static int v1; int v2; int v3; int v4; } another_variable;
in the .cpp i want to access the static variable but the compiler says:
"undefined reference to MainWindow::name::v1"
i want to access it like this:name Name; Name.v1 = 0;
it seems like that i can get to the "normal" ints, but not the static one, why?
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You are missing explicitly initialization for static member.
like this:
int another_variable::v1 = 0;
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@Devopia53
in the .cpp or .h?
If I do it right before my function it says something like:error: qualified-id in declaration before ‘=’ token
and i is it right, that i use the another variable and not the name?
EDIT: i guess i got it.
Not in an function, just above everything i had to write:int MainWindow::another_variable::v1 = 0;
now it compiles, but is this right?
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Hi
Can i ask what you need that single static for ?int MainWindow::another_variable::v1 = 0;
This is correct syntax for init a static class member. Yes
in .cpp , global scope.now it compiles, but is this right?
Yes its correct with syntax but statics are not often used so
i do wonder what the goal of the design is :) -
got it to work, just got rid of the static.
actually, i only wanted to create this variable one time at all. -
@haxxe said in why cant i access my struct?:
Actually, i only wanted to create this variable one time at all.
For a complex object, that is expensive to construct a static might be the solution but
for an int, const might be better even it dont only create it only once but pr instance of the owning class. -
yes, but right now its working and im happy with it :D thanks for all your help.
Qt is awesome, as IDE, as Community, as everything.
its kinda complex to me because i'm really fresh to programming, but i already love it. -
@haxxe
Super
Yep I love Creator too. Very nice editor and Qt as GUI framework is the best i have tried.
Indeed, if you not used c++ super much, the full blown details when starting can be daunting but
you can always ask here. we also have a c++ section if not related to Qt as much. -
l also get problems because i work together with a friend on my projects, and hes just a full c gui, not c++ and this causes problems sometimes. i tried several things, but stick with qt now. its just amazing that i can develop an desktop programm and with 2 clicks it runs already on my pi.
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@haxxe
Yep, there is long way from c to c++ regarding program architecture.
But classes do offer a lot of benefits.