unions

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c++ casting a union to one of its member types

The following seems perfectly logical to me, but isn\'t valid c++. A union cannot be implicitly cast to one of it\'s member types. Anyone kno开发者_开发百科w a good reason why not?[详细]

2023-02-12 09:43 分类：问答
Union to unsigned long long int cast

I have a union as follows: typedef unsigned long GT_U32; typedef unsigned short GT_U16; typedef unsigned char GT_U8;[详细]

2023-02-11 02:57 分类：问答
c++ union in multiple files

I\'m sorry this is long, but it is a little complicated to explain. We recently had to hand in for homework the following program (much simplified here):[详细]

2023-02-10 23:40 分类：问答
Unions that contain a"type" member

I have a qu开发者_如何学Pythonestion about something I still don\'t understand about unions. I\'ve read about a lot of their uses and for the most part can see how they can be useful and understand th[详细]

2023-02-09 03:47 分类：问答
When would anyone use a union? Is it a remnant from the C-only days?

I have learned but don\'t really get unions. Every C or C++ text I go through introduces them (sometimes in passing), but they tend to give very few practical examples of why or where to use them. Whe[详细]

2023-02-06 06:52 分类：问答
Can we use pointer in union?

开发者_JAVA百科If no why? Uses of union over structure?? You can use any data type in a union, there\'s no restriction.[详细]

2023-02-06 06:32 分类：问答
Union memory share in C

Edit2: Can I do polymorphism with Union? It seems to me that I can change the data structure based on my need.[详细]

2023-02-04 08:44 分类：问答
Is a union of structs sharing a first element undefined behavior?

SDL_Event is a union of an unsigned 8 bit type, and many structs whose first element is an unsigned 8 bit type. The reccomended usage is to access the Uint8 element of the union to determine what type[详细]

2023-02-03 17:00 分类：问答
memory alignment issues with union

Is there guarantee, that memory for this object will be properly aligned if we create object of this type in stack?[详细]

2023-01-31 08:24 分类：问答
generically convert from boost::variant<T> to type

I have a typedef boost::variant<int, float, double, long, bool, std::string, boost::posix_time::ptime> variant which I use to store different types of values in a struct. Only one of the specifi[详细]

2023-01-29 15:03 分类：问答