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C++ accessing a variable in a union struct


By : Troy Smith
Date : October 18 2020, 08:10 AM
will help you I am working with a library who has a struct defined as such: ,
I can get x fine using the above method but not a. why?
code :


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Porting C -> C++, having trouble with accessing struct within unnamed union


By : ARNAV
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Looks like you've declared a class or struct bk somewhere earlier in your code. Also
code :
struct tt                       *tt;

How can i declare a variable of a struct which is in a union and this union is in another struct


By : user3008062
Date : March 29 2020, 07:55 AM
it should still fix some issue The standard does not allow nested types in an anonymous union. Your code is not legal.
From the C++ Draft Standard N3337:

Accessing first field of struct in a union of structs


By : Jamie Binns
Date : March 29 2020, 07:55 AM
help you fix your problem The first element of a struct or union is guaranteed to have the same address-value as the struct´/union itself. Apparently it has not the same type!
For your usage, you do not need the cast and actually should avoid it:
code :
printf("%s", p->name);
union data {
    struct TYPEA typea;
    struct TYPEB typeb;
    struct TYPEC typec;
};
printf("%s", p->typea.name);
struct TypeA {
    int x,y;
};

...

struct data {
    char *name;
    union {
        struct TypeA;
        struct TypeB;
        struct TypeC;
    };
};

C++ - Properly accessing nested struct in union


By : CoreyCooper
Date : March 29 2020, 07:55 AM
To fix the issue you can do I tried the above code on code blocks, and it works, but I am sure that this code is not safe to run every time. The reason of your problem is: your 2 function
code :
worker* getHourly()
{
    worker newWorker;
        ...
        return &newWorker;
}

worker* getSalaried() {
    worker newWorker;
     ...
     return &newWorker;
}
worker* getHourly()
{
    worker* newWorker;
     newWorker = new (worker)        
     ...
        return newWorker;
}

worker* getSalaried() {
    worker* newWorker;
     newWorker = new (worker);
     ...
     return &newWorker;
}
worker getHourly()
{
    worker newWorker;
     ...
        return newWorker;
}

worker getSalaried() {
    worker newWorker;
     ...
     return &newWorker;
}

Accessing variables in a union inside a struct


By : Manraj Singh Bhinder
Date : March 29 2020, 07:55 AM
will be helpful for those in need Can anyone please explain why the 1st method of accessing a nested struct element inside an union in a struct works and the 2nd does not? , Try the following:
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