kindred crescent
its causing error when i try to execute this code
class Solution{
public:
static int i;
};
int main (){
int Solution::i = 0;
return 0;
}
it says
main.cpp: In function ‘int main()’:
main.cpp:7:17: error: qualified-id in declaration before ‘=’ token
7 | int Solution::i = 0;
| ^
topaz irisBOT
kindred crescent
whats the error and how to resolve it
icy crane
whats the error and how to resolve it
initialize i in the global scope
because class Solution is defined in the global scope
kindred crescent
because class Solution is defined in the global scope
so whats global scope in cpp
outside main ??
icy crane
whats the order of execution of global space ?
static variabes from a class will be initialized before main starts
global variables also before main starts
kindred crescent
main is defined in global space??
icy crane
yes
kindred crescent
got it
icy crane
functions can be either global, static functions in a class, or member functions in a class
kindred crescent
initialize i in the global scope
but why we need to define it on global space ?
cus class defined in global space?
icy crane
because class Solution is defined in the global scope
.
you can define classes inside of functions
or onside other classes too
kindred crescent
you can define classes inside of functions
but i was doing that only, inside main()
icy crane
~~but i was doing that only, inside main()~~
show me
kindred crescent
~~but i was doing that only, inside main()~~
sorry i read that wrong
kindred crescent
you can define classes inside of functions
if i define class inside function then its static variables will also be init inside that function??
topaz irisBOT
gray gazelle
if i define class inside function then its static variables will also be init in...
well, no
if you define a class inside a function, then that class cannot have static data members/static variables
kindred crescent
oh okay
kindred crescent
well, no
if you define a class inside a function, then that class cannot have st...
if that function is static then also ??
gray gazelle
doesn't matter what kind of function you define the class in
if you define a local class inside any function, that class cannot have static data members/static variables
kindred crescent
if you define a local class inside any function, that class cannot have static d...
why we put that restriction ??
we cannot have static reserve memory of that class, before running that function ??
gray gazelle
never looked into any reason or rationale for that, but at the same time, do you really want that? and assuming you do, what would it mean? do you make the static data member behave more like static data members of non-local classes? or do you make them behave more like static local variables? even just that isn't clear
and considering that those things predate inline variables, how do you even initialize that static data member?
kindred crescent
i think also we have reserve extra memory for them, considering we may never execute that function, and their behavior could be the issue as you said.
i may never use it, but playing with it and understanding what made cpp devs to do so is also fun...
btw thanks for that @gray gazelle