Re: How to initialize a member struct
- From: "Bob Altman" <rda@xxxxxxxxxxxxx>
- Date: Thu, 29 Nov 2007 10:58:10 -0800
Thanks Ben. I guess that's about as clean a solution as I'm likely to get.
- Bob
"Ben Voigt [C++ MVP]" <rbv@xxxxxxxxxxxxx> wrote in message
news:uG%23pPTrMIHA.5400@xxxxxxxxxxxxxxxxxxxxxxx
If I create a MyStruct in "normal" code, I can just write:
MyStruct x = {1, 2, 3};
But I apparently can't include the initializer list (the "{1, 2, 3}") in
a class definition header file where I declare a member variable of type
MyStruct. This leaves me with trying to come up with a way to initialize
the struct in the class constructor. The ugly way to do this is to
explicitly initialize each member of the structure in the constructor
code. But I'm looking for a way to use an initializer list to initialize
the entire struct all at once.
With a helper function:
static MyStruct init_my_struct(int a, int b, int c)
{
const MyStruct x = { a, b, c };
return x;
}
MyConstructor() : member(init_my_struct(1, 2, 3)) {}
Sigh... I told you it was complicated...
""Jeffrey Tan[MSFT]"" <jetan@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:XUMSlNjMIHA.360@xxxxxxxxxxxxxxxxxxxxxxxxx
Hi Bob,
Using initializer list for another structure member means calling that
structure's constructor. So that structure must has a constructor
matching
the signature with the initializer list calling, like this:
struct MyStruct
{
int m_a;
int m_b;
int m_c;
MyStruct(int a, int b, int c)
{
m_a = a;
m_b = b;
m_c = c;
}
};
class Test {
Test::Test(void) : X(1,2,3)
{
}
private:
MyStruct X;
};
Hope it helps.
Best regards,
Jeffrey Tan
Microsoft Online Community Support
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- References:
- How to initialize a member struct
- From: Bob Altman
- RE: How to initialize a member struct
- From: "Jeffrey Tan[MSFT]"
- Re: How to initialize a member struct
- From: Bob Altman
- Re: How to initialize a member struct
- From: Ben Voigt [C++ MVP]
- How to initialize a member struct
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