Hi,
Is it possible to initialize a constant memeber array in a class?
I tried several syntax but all failed.
class A
{
public:
A();
~A();
private:
const int a[4];
};
A::A():a={0,1,2 ,3}
{
}
13  14841 
Kyle wrote: Hi,
Is it possible to initialize a constant memeber array in a class?
I tried several syntax but all failed.
class A
{
public:
A();
~A();
private:
const int a[4];
};
A::A():a={0,1,2 ,3}
{
}
You can only initialize it inside the function body, IIRC. Eg: with a for
loop, copying from that constant array, or with memcpy - if the arrays type
allows it.
--
Attila aka WW
"Kyle" <zh**********@h otmail.com> wrote in message
news:40******** @dnews.tpgi.com .au... Hi,
Is it possible to initialize a constant memeber array in a class?
No, not a nonstatic one. Why do you want to?
-Mike
Kyle wrote: Is it possible to initialize a constant member array in a class?
I tried several syntax but all failed.
struct Array {
int a[4];
};
class A {
private:
// representation
const Array array;
public:
A(const Array& a): array(a) { }
~A(void) { };
};
int main(int argc, char* argv[]) {
Array array = {{0, 1, 2, 3}};
A a(array);
return 0;
}
Attila Feher wrote: Kyle wrote: Hi,
Is it possible to initialize a constant memeber array in a class?
I tried several syntax but all failed.
class A
{
public:
A();
~A();
private:
const int a[4];
};
A::A():a={0,1,2 ,3}
{
}
You can only initialize it inside the function body, IIRC.
No. Initialization of members can only be done in the initializer list.
Eg: with a for loop, copying from that constant array, or with memcpy
- if the arrays type allows it.
He doesn't want to copy something _from_ his array, but rather _to_ it,
which isn't possible, since it's constant.
Rolf Magnus wrote: Attila Feher wrote:
Kyle wrote: Hi,
Is it possible to initialize a constant memeber array in a class?
I tried several syntax but all failed.
class A
{
public:
A();
~A();
private:
const int a[4];
};
A::A():a={0,1,2 ,3}
{
}
You can only initialize it inside the function body, IIRC.
No. Initialization of members can only be done in the initializer
list.
Eg: with a for loop, copying from that constant array, or with memcpy
- if the arrays type allows it.
He doesn't want to copy something _from_ his array, but rather _to_
it, which isn't possible, since it's constant.
I have missed the const.
--
Attila aka WW
I just need an array with constant content. Yes, probably I need to add
static, since this array is identical for all instances. But the following
code still cannot be complied. (gcc3.3.1)
I am really confused with these 'const' problems.
class A
{
static const int a[4]={0,1,2,3};
...
};
"Mike Wahler" <mk******@mkwah ler.net> дÈëÓʼþ
news:AK******** **********@news read2.news.pas. earthlink.net.. . "Kyle" <zh**********@h otmail.com> wrote in message
news:40******** @dnews.tpgi.com .au... Hi,
Is it possible to initialize a constant memeber array in a class?
No, not a nonstatic one. Why do you want to?
-Mike
How to do it?
const array cannot be assigned in constructor body.
"Attila Feher" <at**********@l mf.ericsson.se> дÈëÓʼþ
news:bv******** **@newstree.wis e.edt.ericsson. se... Kyle wrote: Hi,
Is it possible to initialize a constant memeber array in a class?
I tried several syntax but all failed.
class A
{
public:
A();
~A();
private:
const int a[4];
};
A::A():a={0,1,2 ,3}
{
}
You can only initialize it inside the function body, IIRC. Eg: with a for
loop, copying from that constant array, or with memcpy - if the arrays
type allows it.
--
Attila aka WW
Kyle wrote: I just need an array with constant content. Yes, probably I need to
add static, since this array is identical for all instances.
If it's static, it can be initialized.
But the following code still cannot be complied. (gcc3.3.1)
I am really confused with these 'const' problems.
class A
{
static const int a[4]={0,1,2,3};
...
};
You cannot intitialize the array within the class, since you first have
to define the constant (the above only declares it), and when defining
it, you can intitialize it, so try:
class A
{
static const int a[4];
//...
};
And in the implementation file:
const int A::a[4] = {0, 1, 2, 3};
Kyle wrote: How to do it?
const array cannot be assigned in constructor body.
I have missed the const.
--
Attila aka WW This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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