diff -r e1b950c65cb4 -r 837f303aceeb epoc32/include/stdapis/boost/iterator/detail/enable_if.hpp --- a/epoc32/include/stdapis/boost/iterator/detail/enable_if.hpp Wed Mar 31 12:27:01 2010 +0100 +++ b/epoc32/include/stdapis/boost/iterator/detail/enable_if.hpp Wed Mar 31 12:33:34 2010 +0100 @@ -1,119 +1,86 @@ -// Boost enable_if library +// (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 -// Copyright 2003 © The Trustees of Indiana University. +#include +#include -// Use, modification, and distribution is subject to 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) +#include -// Authors: Jaakko Järvi (jajarvi at osl.iu.edu) -// Jeremiah Willcock (jewillco at osl.iu.edu) -// Andrew Lumsdaine (lums at osl.iu.edu) - - -#ifndef BOOST_UTILITY_ENABLE_IF_HPP -#define BOOST_UTILITY_ENABLE_IF_HPP - -#include "boost/config.hpp" - -// Even the definition of enable_if causes problems on some compilers, -// so it's macroed out for all compilers that do not support SFINAE - -#ifndef BOOST_NO_SFINAE +// +// Boost iterators uses its own enable_if cause we need +// special semantics for deficient compilers. +// 23/02/03 thw +// namespace boost { - - template - struct enable_if_c { - typedef T type; - }; - template - struct enable_if_c {}; + namespace iterators + { + // + // Base machinery for all kinds of enable if + // + template + struct enabled + { + template + 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 + { + template + struct base + { +#ifdef BOOST_NO_SFINAE - template - struct enable_if : public enable_if_c {}; + typedef T type; - template - struct lazy_enable_if_c { - typedef typename T::type 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 - struct lazy_enable_if_c {}; - template - struct lazy_enable_if : public lazy_enable_if_c {}; + template + struct enable_if +# if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE) + : enabled<(Cond::value)>::template base +# else + : mpl::identity +# endif + { +# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) + typedef Return type; +# endif + }; - - template - struct disable_if_c { - typedef T type; - }; - - template - struct disable_if_c {}; - - template - struct disable_if : public disable_if_c {}; - - template - struct lazy_disable_if_c { - typedef typename T::type type; - }; - - template - struct lazy_disable_if_c {}; - - template - struct lazy_disable_if : public lazy_disable_if_c {}; + } // namespace iterators } // namespace boost -#else +#include -namespace boost { - - namespace detail { typedef void enable_if_default_T; } - - template - struct enable_if_does_not_work_on_this_compiler; - - template - struct enable_if_c : enable_if_does_not_work_on_this_compiler - { }; - - template - struct disable_if_c : enable_if_does_not_work_on_this_compiler - { }; - - template - struct lazy_enable_if_c : enable_if_does_not_work_on_this_compiler - { }; - - template - struct lazy_disable_if_c : enable_if_does_not_work_on_this_compiler - { }; - - template - struct enable_if : enable_if_does_not_work_on_this_compiler - { }; - - template - struct disable_if : enable_if_does_not_work_on_this_compiler - { }; - - template - struct lazy_enable_if : enable_if_does_not_work_on_this_compiler - { }; - - template - struct lazy_disable_if : enable_if_does_not_work_on_this_compiler - { }; - -} // namespace boost - -#endif // BOOST_NO_SFINAE - -#endif +#endif // BOOST_ENABLE_IF_23022003THW_HPP