3941 

  3941 

  3942 If you can get to Interface B from Interface A, and you can get to Interface C

  3942 If you can get to Interface B from Interface A, and you can get to Interface C

  3943 from Interface B, then a QueryInterface on Interface A looking for Interface C

  3943 from Interface B, then a QueryInterface on Interface A looking for Interface C

  3944 must also succeed.

  3944 must also succeed.

  3945 

  3945 

  3947 The final piece of this puzzle is to locate where the interface Ids actually

  3947 The final piece of this puzzle is to locate where the interface Ids actually

  3948 come from.  The answer is from a static initializer that must be located in 

  3948 come from.  The answer is from a static initializer that must be located in 

  3949 the @code{.cc} file corresponding to the Interface.  For example, to 

  3949 the @code{.cc} file corresponding to the Interface.  For example, to 

  3950 initialize the Interface Id for the class A above, you would simply add the

  3950 initialize the Interface Id for the class A above, you would simply add the

  3951 following code to the source file that implements class A,

  3951 following code to the source file that implements class A,