Compiler Warning (level 3) C4640

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

Remarks

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.

Example

The following example generates C4640:

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

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

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

int main() {
   f();
}