|
Server : Apache/2.2.2 (Fedora) System : Linux App1.pathumtani.go.th 2.6.20-1.2320.fc5smp #1 SMP Tue Jun 12 19:40:16 EDT 2007 i686 User : apache ( 48) PHP Version : 5.2.9 Disable Function : NONE Directory : /usr/include/boost/ |
Upload File : |
//-----------------------------------------------------------------------------
// boost blank.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Eric Friedman
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_BLANK_HPP
#define BOOST_BLANK_HPP
#include "boost/blank_fwd.hpp"
#include <iosfwd> // for std::basic_ostream forward declare
#include "boost/detail/templated_streams.hpp"
#include "boost/mpl/bool.hpp"
#include "boost/type_traits/is_empty.hpp"
#include "boost/type_traits/is_pod.hpp"
#include "boost/type_traits/is_stateless.hpp"
namespace boost {
struct blank
{
};
// type traits specializations
//
template <>
struct is_pod< blank >
: mpl::true_
{
};
template <>
struct is_empty< blank >
: mpl::true_
{
};
template <>
struct is_stateless< blank >
: mpl::true_
{
};
// relational operators
//
inline bool operator==(const blank&, const blank&)
{
return true;
}
inline bool operator<(const blank&, const blank&)
{
return false;
}
// streaming support
//
BOOST_TEMPLATED_STREAM_TEMPLATE(E,T)
inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<(
BOOST_TEMPLATED_STREAM(ostream, E,T)& out
, const blank&
)
{
// (output nothing)
return out;
}
} // namespace boost
#endif // BOOST_BLANK_HPP