[boost] [integer] Proposal: minor addition to cstdint.hpp: largest integer types for value-based template arguments

From: Daryle Walker (darylew_at_[hidden])
Date: 2008-07-17 04:02:13

I just added some class templates that had declarations like:

//========================================
template < intmax_t Value >
     struct whatever;
//========================================

Afterwards, I was looking over some of the Boost.Integer headers and  
got curious about the BOOST_NO_INTEGRAL_INT64_T setting used within  
<boost/integer_traits.hpp>.  I think we could add two typedefs to  
<boost/cstdint.hpp>

//========================================
#if !defined(BOOST_NO_INT64_T) && defined(BOOST_NO_INTEGRAL_INT64_T)
     typedef   signed long   intmaxc_t;
     typedef unsigned long  uintmaxc_t;
#else
     typedef  intmax_t   intmaxc_t;
     typedef uintmax_t  uintmaxc_t;
#endif
//========================================

Where "intmaxc_t" is the largest signed integer type that is suitable  
for integer constant expressions (like value-based template  
parameters) and "uintmaxc_t" is the unsigned equivalent.  They should  
be the same as "intmax_t" and "uintmax_t" on non-broken compilers.   
I'd change my code to use the new types, to be safer.

-- 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT hotmail DOT com