unions

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Purpose of Unions in C and C++

I have used unions earlier comfortably; today I was alarmed when I read this post and came to know that this code[详细]

2022-12-20 17:46 分类：问答
Assignment to unions of members

Let\'s say I have a class with union members in it: class ClassX { public: union { StructA * A; StructB * B;[详细]

2022-12-19 13:43 分类：问答
Can a union be initialized in the declaration?

For example, say we have a union typedef union { unsigned long U32; float f; }U_U32_F; When a variable of t开发者_如何学Gohis union type is declared, is there a way to set an initial value?[详细]

2022-12-18 10:46 分类：问答
Using array of chars as an array of long ints

On my AVR I have an array of chars that hold color intensity information in the form of {R,G,B,x,R,G,B,x,...} (x being an unused byte).Is there any simple way to write a long int (32-bits) to char myA[详细]

2022-12-16 05:14 分类：问答
Cannot marshal a struct that contains a union

I have a C++ struct that looks like this: struct unmanagedstruct { int开发者_JS百科flags; union { intoffset[6];[详细]

2022-12-15 09:18 分类：问答
PInvoke returns C type with union

How would I P/Invoke a C function which returns a union\'ed struct?开发者_如何学JAVAYou would need to use a StructLayout of explicit and the FieldOffset attribute.[详细]

2022-12-14 08:43 分类：问答
union members may not have constructors, but `std::pair` okay?

union members may not have destructors or constructors. So I can\'t template the following class Foo on my own MyClass if MyClass has a constructor:[详细]

2022-12-14 06:17 分类：问答
Use of a Union to avoid Dynamic Allocation Headaches

I\'m curious if it\'s a good idea to use a union when accessing Win32 APIs that return variable length structures, to avoid manually managing the allocated memory.[详细]

2022-12-13 23:00 分类：问答
Is it possible (legal) to assign an anonymous union in a compound literal?

I have a struct: typedef struct _n { int type; union { char *s; int i; }; } n; When I try to assign a compound literal, like:[详细]

2022-12-13 15:29 分类：问答
Strange Behaviour Class Objects Inside Union

Hi I wanted know the reasons of the following code void main() { class test { public: test(){} int k; }; class test1[详细]

2022-12-13 10:47 分类：问答