Re: [boost] Config and "unused variables"

From: brangdon_at_[hidden]
Date: 2001-09-24 16:14:10

> It's fairly common to have unused variables in Boost code for various 
> reasons.  For instance, a common work around for a VC++ bug is to 
> have code such as:
> 
> template <typename T>
> void foo(T* dummy=0)
> {
> }
> 
> The dummy parameter is never used, and is there solely to help the 
> VC++ compiler figure out the template argument types.  Most compilers 
> will warn on such usage and as good citizens we should try and reduce 
> all possible warnings generated by any compiler.

Isn't it enough to omit the argument name?

  template <typename T>
  void foo(T*=0)
  {
  }

Since the argument has no name it cannot be used, and I don't think any 
compiler will warn about non-use. The name is just acting as a comment. If 
you like, you can use a comment:

  template <typename T>
  void foo( T * /*dummy*/ = 0 )
  {
  }
  
Dave Harris