Article ID: 117383 - Last Review: July 5, 2005 - Revision: 2.1

BUG: C2483 Instantiating Objects with the Thread Attribute

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This article was previously published under Q117383

SYMPTOMS

Instantiating a C++ object with the thread attribute generates the following error message if the class contains private or protected members:

error C2483: object with constructor cannot be declared 'thread'

To paraphrase page 397 of the "C++ Language Reference," class objects may be instantiated with the thread attribute if the objects do not need to be constructed or destructed. However, this error occurs even though the class does not have a constructor or a destructor.

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CAUSE

Currently, thread local storage has only been implemented for aggregate types. An aggregate type is defined as an array or object of a class with no constructors, no private or protected members, no base classes, and no virtual functions. In this case, private or protected members make the class an aggregate; therefore, the error message is generated.

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Sample Code

/* Compile options needed: /c /MT
*/ 

class B
{
// Uncomment the following line to eliminate compiler error
// public:
      int i;
};

__declspec(thread) B b; // error C2483

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