Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Compiler Warning (level 3) C4640
Collapse the table of content
Expand the table of content

Compiler Warning (level 3) C4640

Error Message

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

A static instance of an object is not thread safe.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

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();
}

Community Additions

ADD
Show:
© 2015 Microsoft