TITLE: nested structures initialization

(Source: comp.lang.c++.moderated, 23 Dec 2000)

BELOFAST: Nickolay.Belofastow@ieee.org

>> // This is in the global scope!
>> struct cTest1
>> {
>>   int a;
>>   int b;
>> };
>>
>> const cTest1 v1 = {1, 2};
>>
>> struct cTest2
>> {
>>   int c;
>>   cTest1 d;
>> };
>>
>> const cTest2 v2 = {3, v1}; // Error here
>>
>> In the last line, where I try to initialize v2 variable, my compiler
>> gives me an error message. I tested with both MS Visual C++ 6.0 and
>> Borland C++ 5.02 -- the same results. Both compilers could not
>> initialize filed d of cTest2, complaining "there is no conversion from
>> cTest1 to int".


ROOZEMAAL: Peter Roozemaal <mathfox@xs4all.nl>

>I can't find a problem with this code; neither does gcc. Could it be
>compiler bugs?


CLAMAGE: "Stephen Clamage" <stephen.clamage@sun.com>

Originally, you could not use a structured value to initialize a
class member using brace-initialization. You would have to write
CTest2 v2 = { 3, {1, 2} }; // the inner braces are not required

A relatively recent addition to the C++ standard allows the code you
show above. Not all compiles implement the feature yet.



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