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168 lines
3.8 KiB
168 lines
3.8 KiB
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. |
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// Use, modification and distribution are subject to the Boost Software License, |
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt). |
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// |
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// See http://www.boost.org/libs/utility for most recent version including documentation. |
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// |
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// Crippled version for crippled compilers: |
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// see libs/utility/call_traits.htm |
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// |
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/* Release notes: |
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01st October 2000: |
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Fixed call_traits on VC6, using "poor man's partial specialisation", |
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using ideas taken from "Generative programming" by Krzysztof Czarnecki |
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& Ulrich Eisenecker. |
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*/ |
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#ifndef BOOST_OB_CALL_TRAITS_HPP |
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#define BOOST_OB_CALL_TRAITS_HPP |
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#ifndef BOOST_CONFIG_HPP |
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#include <boost/config.hpp> |
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#endif |
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#ifndef BOOST_ARITHMETIC_TYPE_TRAITS_HPP |
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#include <boost/type_traits/arithmetic_traits.hpp> |
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#endif |
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#ifndef BOOST_COMPOSITE_TYPE_TRAITS_HPP |
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#include <boost/type_traits/composite_traits.hpp> |
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#endif |
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namespace boost{ |
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#ifdef BOOST_MSVC6_MEMBER_TEMPLATES |
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// |
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// use member templates to emulate |
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// partial specialisation: |
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// |
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namespace detail{ |
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template <class T> |
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struct standard_call_traits |
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{ |
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typedef T value_type; |
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typedef T& reference; |
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typedef const T& const_reference; |
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typedef const T& param_type; |
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}; |
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template <class T> |
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struct simple_call_traits |
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{ |
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typedef T value_type; |
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typedef T& reference; |
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typedef const T& const_reference; |
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typedef const T param_type; |
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}; |
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template <class T> |
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struct reference_call_traits |
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{ |
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typedef T value_type; |
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typedef T reference; |
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typedef T const_reference; |
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typedef T param_type; |
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}; |
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template <bool pointer, bool arithmetic, bool reference> |
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struct call_traits_chooser |
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{ |
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template <class T> |
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struct rebind |
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{ |
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typedef standard_call_traits<T> type; |
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}; |
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}; |
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template <> |
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struct call_traits_chooser<true, false, false> |
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{ |
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template <class T> |
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struct rebind |
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{ |
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typedef simple_call_traits<T> type; |
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}; |
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}; |
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template <> |
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struct call_traits_chooser<false, false, true> |
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{ |
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template <class T> |
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struct rebind |
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{ |
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typedef reference_call_traits<T> type; |
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}; |
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}; |
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template <bool size_is_small> |
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struct call_traits_sizeof_chooser2 |
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{ |
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template <class T> |
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struct small_rebind |
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{ |
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typedef simple_call_traits<T> small_type; |
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}; |
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}; |
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template<> |
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struct call_traits_sizeof_chooser2<false> |
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{ |
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template <class T> |
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struct small_rebind |
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{ |
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typedef standard_call_traits<T> small_type; |
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}; |
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}; |
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template <> |
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struct call_traits_chooser<false, true, false> |
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{ |
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template <class T> |
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struct rebind |
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{ |
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enum { sizeof_choice = (sizeof(T) <= sizeof(void*)) }; |
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typedef call_traits_sizeof_chooser2<(sizeof(T) <= sizeof(void*))> chooser; |
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typedef typename chooser::template small_rebind<T> bound_type; |
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typedef typename bound_type::small_type type; |
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}; |
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}; |
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} // namespace detail |
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template <typename T> |
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struct call_traits |
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{ |
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private: |
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typedef detail::call_traits_chooser< |
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::boost::is_pointer<T>::value, |
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::boost::is_arithmetic<T>::value, |
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::boost::is_reference<T>::value |
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> chooser; |
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typedef typename chooser::template rebind<T> bound_type; |
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typedef typename bound_type::type call_traits_type; |
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public: |
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typedef typename call_traits_type::value_type value_type; |
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typedef typename call_traits_type::reference reference; |
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typedef typename call_traits_type::const_reference const_reference; |
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typedef typename call_traits_type::param_type param_type; |
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}; |
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#else |
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// |
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// sorry call_traits is completely non-functional |
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// blame your broken compiler: |
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// |
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template <typename T> |
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struct call_traits |
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{ |
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typedef T value_type; |
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typedef T& reference; |
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typedef const T& const_reference; |
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typedef const T& param_type; |
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}; |
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#endif // member templates |
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} |
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#endif // BOOST_OB_CALL_TRAITS_HPP
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