unions

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Why can't anonymous unions contain members with non-trivial constructors/destructors?

I may be mistaken, but the basic explanation I\'ve found has been that the union can\'t initialize because it doesn\'t know which member\'s constructor to call. The compiler can not automatically gene[详细]

2023-01-29 10:08 分类：问答
c(++) union Data structure

I\'m programming for a µC, i have following data Structure: typedef struct { RF12Head head; typedef union[详细]

2023-01-28 16:38 分类：问答
query with multiple or vs union multiple queries, which one will be faster?

As the name suggests, a query with multiple or will be faster or a query with multiple query joined with union will be faster?I have joined only two tables to make it simple but there can be more tabl[详细]

2023-01-24 13:58 分类：问答
Why are global anonymous unions required to be declared as static?

C++ 0x draft 9.5.6 Anonymous unions declared in a named namespace or in the global namespace shall be decl开发者_如何学Cared static.[详细]

2023-01-22 19:37 分类：问答
What's the major difference between "union" and "struct" in C.? [duplicate]

This question already has answers here: Closed 12 years ago. Possible Duplicate: Difference between a Structure and a Union in C[详细]

2023-01-21 05:56 分类：问答
Help casting a pointer to a union

I am working on C firmware project. I have a union that is defined as, typedef union { unsigned long value;[详细]

2023-01-19 09:16 分类：问答
C++ unrestricted union workaround

#include <stdio.h> struct B { int x,y; }; struct A : public B { // This whines about \"copy assignment operator not allowed in union\"[详细]

2023-01-18 23:06 分类：问答
Unions within unions

In C, is it possible to define a union within another union? If no, why is it not possible? Or if yes, where can it be 开发者_JS百科used?Suppose you want to define:[详细]

2023-01-18 15:14 分类：问答
Implementing C's enum and union in python

I\'m trying to figure out some C code so that I can port it into python. The code is for reading a proprietary binary data file format. It has been straightforward thus far -- it\'s mainly been struct[详细]

2023-01-18 10:41 分类：问答
Stuff a class with user-defined constructors into a union

class Foo { Foo(int val) { /* Do some initialization */ } Foo() { /* Do nothing */ } }; union Bar { Foo foo;[详细]

2023-01-17 14:00 分类：问答