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Compiler Warning (level 3) C4640

'instance' : construction of local static object is not thread-safe

A static instance of an object is not thread safe.

The following sample generates C4640:

// C4640.cpp
// compile with: /W3
#pragma warning(default:4640)

class X {
public:
   X() {
   }
};

void f() {
   static X aX;   // C4640
}

int main() {
   f();
}
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