id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
1532,#pragma once,NN,John Maddock,"The most of modern compilers do support #pragma once feature.
This can reduce significantly the compilation time.
Boost should use this too.

Proposal:
In boost/config.hpp define the BOOST_ONCE macro: (Of course this should be defined in the right compiler configuration header file)
{{{
!#cpp
// VC >4.0
// GCC >=4.30
// ICC >10
#if (defined(_MSC_VER) && _MSC_VER > 1000) || \
    (defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 30) || (__GNUC__ > 4))) || \
    (defined(__ICC) && __ICC > 1000)
#   define BOOST_ONCE once    
#else
#   define BOOST_ONCE message("""")
#endif
}}}

Using in other files:
boost/xxx/yyy.hpp
{{{
!#cpp
#ifndef BOOST_XXX_YYY_INCLUDED
#define BOOST_XXX_YYY_INCLUDED

#include <boost/config.hpp>

#pragma BOOST_ONCE

#endif // BOOST_XXX_YYY_INCLUDED
}}}",Feature Requests,closed,Boost 1.36.0,config,Boost 1.34.1,Optimization,wontfix,,