[Patch] libstdc++/29989

[Martin Sebor]

Doug Gregor wrote:
> 
> On Dec 4, 2006, at 1:02 PM, Paolo Carlini wrote:
> 
>> Doug Gregor wrote:
>>
>>> <windows.h> is known to #define min and max as macros.
>>
>>
>> Interesting, thanks. Then, what do you suggest? Should we undef min  
>> and max elsewhere too? The PR was about <limits>, which, at some  
>> point in the far past also had undefs, not anymore...
> 
> 
> In Boost, we do backflips to avoid the problem without #undef'ing min  
> or max. We have a macro like this:
> 
>     #define BOOST_PREVENT_MACRO_SUBSTITUTION
> 
> To use min or max in the library, we write, e.g.,
> 
>     min BOOST_PREVENT_MACRO_SUBSTITUTION (x, y)

FWIW, we simply parenthesize the names:

   template <class T, class Compare>
   const T& (min)(const T&, const T&, Compare);

   template <class T>
   const T& (min)(const T &a, const T &b) {
       return (min)(a, b, less<T>());
   }

Martin