[LLVMdev] Is it possible using anonymous namespace on template in header files.

[Sebastian Redl]

罗勇刚(Yonggang Luo) wrote:
> for example
>   /// getPointerUnionTypeNum - If the argument has type PT1* or PT2* return
>   /// false or true respectively.
>   template <typename PT1, typename PT2>
>   static inline int getPointerUnionTypeNum(PT1 *P) { return 0; }
>   template <typename PT1, typename PT2>
>   static inline int getPointerUnionTypeNum(PT2 *P) { return 1; }
>   template <typename PT1, typename PT2>
>   static inline int getPointerUnionTypeNum(...) { return -1; }
>
> it's a peace of code comes from PointerUnion.h
>
> can it change to be
> namespace{
>   template <typename PT1, typename PT2>
>   inline int getPointerUnionTypeNum(PT1 *P) { return 0; }
>   template <typename PT1, typename PT2>
>   inline int getPointerUnionTypeNum(PT2 *P) { return 1; }
>   template <typename PT1, typename PT2>
>   inline int getPointerUnionTypeNum(...) { return -1; }
> }
>   
Using the anonymous namespace in a header file is generally a very bad
idea. The problem is that it is a different namespace in every
translation unit. This can lead to subtle errors or simply undesirable
behavior.

Why would you want these functions in the AN anyway?

Sebastian