Compiler Error C2451

conditional expression of type 'type' is illegal

The conditional expression evaluates to an integer type.

The following sample generates C2451:

// C2451.cpp
class B {};

int main () {
   B b1;
   int i = 0;
   if (b1)   // C2451
   // try the following line instead
   // if (i)
      ;
}
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