aggregate initialisation

[Raghu]

Hello all,
Can somebody help me hopw to resolve teh probelm of aggregate initialisation
in c++.
Her eis the piece of code.

#include<stdio. h>

class MyTest
{
public:
DECLARE_AGGREGA TABLE (MyTest);
MyTest(float input = 0.0f):Data(inpu t){}
float Data;
};

struct MyStruct
{
MyTest a;
int b;
};
struct MyStruct test[2] = { {1.2f,1},{2.4f, 3}};

int main()
{

printf("%f\n",t est[0].a.Data);
return 0;
}

I am getting the compialtion error as follows:

error C2440: 'initializing' : cannot convert from 'const float' to 'struct
MyStruct'
No constructor could take the source type, or constructor overload
resolution was ambiguous.

And when i decalrea str4uct variable as follows:

struct MyStruct test = { 1.2f ,3 };
I am getting the following error:

error C2552: 'test' : non-aggregates cannot be initialized with initializer
list

Is there any option to use initaliser list toassign the UDTS aggregately?
Your help is needed at the earliest.

Thanks in Advance.
Raghu

[benben]

Re: aggregate initialisation

Raghu wrote:[color=blue]
> Hello all,
> Can somebody help me hopw to resolve teh probelm of aggregate initialisation
> in c++.[/color]

What is aggregate initialization anyway? Aggregation can have a lot of
meanings in different contexts, which one are you talking about?
[color=blue]
> Her eis the piece of code.
>
> #include<stdio. h>
>
> class MyTest
> {
> public:
> DECLARE_AGGREGA TABLE (MyTest);[/color]

Well, what is DECLARE_AGGREGA TEABLE? Either provide the definition of
that macro or provide the resultant (non-macro) code equivalent.
[color=blue]
> MyTest(float input = 0.0f):Data(inpu t){}
> float Data;
> };
>
> struct MyStruct
> {
> MyTest a;
> int b;
> };
> struct MyStruct test[2] = { {1.2f,1},{2.4f, 3}};[/color]

MyStruct test[] = {{MyTest(1.2f), 1}, {MyTest(2.4f), 3}};
[color=blue]
>
> int main()
> {
>
> printf("%f\n",t est[0].a.Data);
> return 0;
> }
>
> I am getting the compialtion error as follows:
>
> error C2440: 'initializing' : cannot convert from 'const float' to 'struct
> MyStruct'
> No constructor could take the source type, or constructor overload
> resolution was ambiguous.
>
> And when i decalrea str4uct variable as follows:
>
> struct MyStruct test = { 1.2f ,3 };[/color]

MyStruct test = {MyTest(1.2f), 3};
[color=blue]
> I am getting the following error:
>
> error C2552: 'test' : non-aggregates cannot be initialized with initializer
> list
>
> Is there any option to use initaliser list toassign the UDTS aggregately?
> Your help is needed at the earliest.[/color]

I still don't get why you need a macro for this matter but if you just
change the lines to those I wrote it should be all right...
[color=blue]
>
> Thanks in Advance.
> Raghu
>[/color]

Regards,
Ben

[Ron Natalie]

Re: aggregate initialisation

Raghu wrote:[color=blue]
> Hello all,
> Can somebody help me hopw to resolve teh probelm of aggregate initialisation
> in c++.
> Her eis the piece of code.
>
> #include<stdio. h>
>
> class MyTest
> {
> public:
> DECLARE_AGGREGA TABLE (MyTest);[/color]

What does the above line mean?

[Ron Natalie]

Re: aggregate initialisation

benben wrote:[color=blue]
> Raghu wrote:[color=green]
>> Hello all,
>> Can somebody help me hopw to resolve teh probelm of aggregate
>> initialisation
>> in c++.[/color]
>
> What is aggregate initialization anyway? Aggregation can have a lot of
> meanings in different contexts, which one are you talking about?
>[/color]
The C++ standard defines aggregate. MyTest is not an aggregate (has
a user-defined constructor). However MyStruct is an aggregate. A
member that is not an aggregate itself is permitted in an aggregate.
(It's not like POD's where everything contained within must also be
POD).