[boost] Re: Serialization Library Draft # 10

From: David Abrahams (dave_at_[hidden])
Date: 2003-09-06 19:05:00

Robert Ramey <ramey_at_[hidden]> writes:

> Finally, BOOST_STATIC_WARNING should be considered.  
> This turns out to be highly compiler dependent but worth
> the effort in my opinion.  I made for msvc but the version
> doesn't work with gcc.  In my opinion this is very doable
> and very useful as well.

We were going to roll the following into MPL; instantiating print<T>
produces a warning message containing T on most compilers.

---
// boost/mpl/print.hpp -- Copyright 2003 Dave Abrahams
#include <boost/config.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/range_c.hpp>
#include <boost/mpl/plus.hpp>
#include <boost/mpl/fold.hpp>
#include <boost/mpl/identity.hpp>
namespace boost { namespace mpl
{
#if BOOST_MSVC
# pragma warning(push, 3)
// we only want one warning from MSVC, so turn off the other one
# pragma warning(disable: 4307)
#elif __MWERKS__
# pragma warn_hidevirtual on
#endif
#if __EDG_VERSION__
template <class T>
struct dependent_unsigned
{
    static const unsigned value = 1;
};
#endif
struct fu { virtual void f() {} };
template <class T>
struct incomplete;
  
template <class T>
struct print :  mpl::identity<T>
#if __MWERKS__
    , fu
#endif 
{
#if BOOST_MSVC
    enum { n = sizeof(T) + -1 };
#elif __MWERKS__
    void f(int);
#else 
    enum {
        n =
# if __EDG_VERSION__ 
           dependent_unsigned<T>::value
# else 
           sizeof(T)
# endif 
           > -1, };
#endif 
};
}}
#if BOOST_MSVC
# pragma warning(pop)
#elif __MWERKS__
# pragma warn_hidevirtual reset
#endif
-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com