I am following simple examples to build up my understanding on private static members. However, I am getting compilation errors.
Here is the example, I am following -
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.cbclx01/cplr038.htm
have changed the c++ version to see if it something to do with c++ version.
class test1
{
static int i;
static int j;
static int k;
static int f() { return 0;}
int p;
public:
test1()
{
p = 0;
}
};
int main(void)
{
test1 t;
int test1::i = test1::f();
int test1::j = test1::i;
return 0;
}
Compiling this code -
Why does it fail here whereas the example link says it works.
$g++ -std=c++14 t1.cpp -o t1.out
t1.cpp: In function ‘int main()’:
t1.cpp:19:16: error: qualified-id in declaration before ‘=’ token
int test1::i = test1::f();
^
t1.cpp:20:16: error: qualified-id in declaration before ‘=’ token
int test1::j = test1::i;
It works if I do like this -
class test1
{
static int i;
static int j;
static int k;
static int f() { return 0;}
int p;
public:
test1()
{
p = 0;
}
};
int test1::i = test1::f();
int test1::j = test1::i;
int main(void)
{
test1 t;
return 0;
}
Why it has to be defined outside of main() ? It works with private also. However, it cannot be defined inside main function. My understanding is that static int inside class is just a declaration. It needs to be defined somewhere. I am defining it within main() but it doesn't work. It needs to be global and I don't know why it needs to be global? It has nothing to do with private/public in my opinion. Please clarify my doubt here.
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