diff options
Diffstat (limited to 'contrib/src/boost/iterator/detail/enable_if.hpp')
-rw-r--r-- | contrib/src/boost/iterator/detail/enable_if.hpp | 166 |
1 files changed, 83 insertions, 83 deletions
diff --git a/contrib/src/boost/iterator/detail/enable_if.hpp b/contrib/src/boost/iterator/detail/enable_if.hpp index c0da4b4..071f5fe 100644 --- a/contrib/src/boost/iterator/detail/enable_if.hpp +++ b/contrib/src/boost/iterator/detail/enable_if.hpp @@ -1,83 +1,83 @@ -// (C) Copyright David Abrahams 2002.
-// (C) Copyright Jeremy Siek 2002.
-// (C) Copyright Thomas Witt 2002.
-// 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_ENABLE_IF_23022003THW_HPP
-#define BOOST_ENABLE_IF_23022003THW_HPP
-
-#include <boost/detail/workaround.hpp>
-#include <boost/mpl/identity.hpp>
-
-#include <boost/iterator/detail/config_def.hpp>
-
-//
-// Boost iterators uses its own enable_if cause we need
-// special semantics for deficient compilers.
-// 23/02/03 thw
-//
-
-namespace boost
-{
-
- namespace iterators
- {
- //
- // Base machinery for all kinds of enable if
- //
- template<bool>
- struct enabled
- {
- template<typename T>
- struct base
- {
- typedef T type;
- };
- };
-
- //
- // For compilers that don't support "Substitution Failure Is Not An Error"
- // enable_if falls back to always enabled. See comments
- // on operator implementation for consequences.
- //
- template<>
- struct enabled<false>
- {
- template<typename T>
- struct base
- {
-#ifdef BOOST_NO_SFINAE
-
- typedef T type;
-
- // This way to do it would give a nice error message containing
- // invalid overload, but has the big disadvantage that
- // there is no reference to user code in the error message.
- //
- // struct invalid_overload;
- // typedef invalid_overload type;
- //
-#endif
- };
- };
-
-
- template <class Cond,
- class Return>
- struct enable_if
-# if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE)
- : enabled<(Cond::value)>::template base<Return>
-# else
- : mpl::identity<Return>
-# endif
- {
- };
-
- } // namespace iterators
-
-} // namespace boost
-
-#include <boost/iterator/detail/config_undef.hpp>
-
-#endif // BOOST_ENABLE_IF_23022003THW_HPP
+// (C) Copyright David Abrahams 2002. +// (C) Copyright Jeremy Siek 2002. +// (C) Copyright Thomas Witt 2002. +// 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_ENABLE_IF_23022003THW_HPP +#define BOOST_ENABLE_IF_23022003THW_HPP + +#include <boost/detail/workaround.hpp> +#include <boost/mpl/identity.hpp> + +#include <boost/iterator/detail/config_def.hpp> + +// +// Boost iterators uses its own enable_if cause we need +// special semantics for deficient compilers. +// 23/02/03 thw +// + +namespace boost +{ + + namespace iterators + { + // + // Base machinery for all kinds of enable if + // + template<bool> + struct enabled + { + template<typename T> + struct base + { + typedef T type; + }; + }; + + // + // For compilers that don't support "Substitution Failure Is Not An Error" + // enable_if falls back to always enabled. See comments + // on operator implementation for consequences. + // + template<> + struct enabled<false> + { + template<typename T> + struct base + { +#ifdef BOOST_NO_SFINAE + + typedef T type; + + // This way to do it would give a nice error message containing + // invalid overload, but has the big disadvantage that + // there is no reference to user code in the error message. + // + // struct invalid_overload; + // typedef invalid_overload type; + // +#endif + }; + }; + + + template <class Cond, + class Return> + struct enable_if +# if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE) + : enabled<(Cond::value)>::template base<Return> +# else + : mpl::identity<Return> +# endif + { + }; + + } // namespace iterators + +} // namespace boost + +#include <boost/iterator/detail/config_undef.hpp> + +#endif // BOOST_ENABLE_IF_23022003THW_HPP |