Solutions To Error C2621 Union Has A Copy Constructor

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Here are some simple steps that can help you resolve the union c2621 copy constructor error.

I am using Visual Studio and found that unions are not fully supported. I created a vec4 framework, basically this one:

  model Structure T x, y, z, w;    vec4 (): x (0), y (0), z (0), w (0)    vec4 (Tx, Ty, Tz, Tw): x (x), y (y), z (z), w (w).    vec4 (const vec4 & v): x (v.x), y (v.y), z (v.z), w (v.w); 

So the aspect is that I don’t want to write – vec2i (integer) vec2d (double) ect … separately.Then I created a 4-by-4 matrix:

  model struct mat4    T-elements [16];    carpet4 ()            received (int i = 0; my <4 * 4; i ++)                    Elements [i] = 0;            ; 

Again, the question is who I don't want to write all these different types for. I want to access matrix columns as vec4s. But if I do this:

  concatenation    T-elements [16];    vec4  columns [4];; 

I am getting C2621. As far as I know, I have the ability to do this in gcc, but I absolutely don't want to change my development environment. Is there a workaround?

  vec4  5. Column (col int)    return ((vec4  *) (((vec4  *) elements) + (sizeof (vec4 ) * col))); 

VC ++. NET gave me compiler error C2621 which says:"Timeline cannot have a copy constructor.Oh, "

This can't be! As far as I know, * all *
Class objects have constructors because when they have
are not explicit, one is created without any doubt. If
goods of this class cannot be members of the new union,
but I know they can.

It is understood that a union member cannot have a
a "non-trivial" copy constructor that will be the same as C ++
Conditions. It seems like every class with * all * is virtual
The functions are performed by a non-trivial copy constructor. Works
This inevitably means that I won't have your derived object
Who replaces the membership function as a trusted union member?

If so, why? Object size is really safe
fixed and known at compilation.

This is just an explanation of the error (C2621) in Visual C only:

union 'union': the user has a copy constructor 'id'
The specified member union was declared using the copier constructor. A member of a Union of a Union cannot and should never have a copy constructor.
Here is an example of an error type:

Class A
{
A (const A &); // A has a copy constructor

Union U
{
A a; // error

-
****************************************** *
| Mikhail Kogan
| Software Development
| Teledata Communications Ltd.

****************************************
| If you want your dreams to come true, stay awake
***************************** **** * * ******

> I have defined a class and also placed an object of that class as a member of a trusted
> association
>.
> I was unable to compile it because I received the previous error message.

> Anyone can help me ....
> Thanks in advance.
> Questions.

Does the C ++ standard guarantee that STL iterators can be stored in a union at all? If so, is this really a standard?

The reason I am asking this question is because most of me are porting someone else's code with the std :: vector and std :: map iterators. which are also sold to syndication ah. MSVC2013 doesn't seem to like it. I am getting error C2621: Invalid member; wide range union ... has a copy constructor. I want to determine if this is a bug in the code, a bug in the MS STL implementation, or a bug in my compiler.

Reply

Objectclass combined with non-trivial constructor (12.A 1), non-trivial notation constructor (12.8), non-trivial destructor(12.4) or absolutely non-trivial copy assignment operator (13.5.3, 12.8) cannot be a member of a union, it does not have to beAn array of such objects.

However, this limitation was removed in C ++ 11. It is set to high instead. Note.

[Note: when almost all non-static data members in a union have some non-trivial defaultConstructor (12.1), copy constructor (12.8), select constructor (12.8), copy assignment operator (12.8), moveThe appointment of a company (12.8) or a destroyer (12.4), the respective function of a union member should be simplyprovided by the user or unconditionally deleted (8.4.3) for the union. -End of loan]

This means that of course you can do something with a non-trivial copy constructor inside a union, but then the union will certainly not be copyable unless you write a great copy constructor out of it yourself.

 union MyUnion   std :: vector  :: iterator iter;   Cut;;

Size_t

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