WannabeBoost.MMAP demo1

mmap.demo1.cpp

#define BOOST_MMAP_HEADER_ONLY
#include <boost/mmap/mapped_view/mapped_view.hpp>
#include <boost/mmap/mappable_objects/file/utility.hpp>

int main( int /*argc*/, char * /*argv*/[] ) noexcept
{
    auto maybe_foo_view( boost::mmap::map_read_only_file( "foo" )() );
    if ( !maybe_foo_view )
        return static_cast<int>( maybe_foo_view.error() );
    if ( maybe_foo_view->empty() )
        return -1;
    return (*maybe_foo_view)[ 0 ];
}