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143 lines
3.7 KiB
C++
143 lines
3.7 KiB
C++
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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// Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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// See http://www.boost.org for most recent version including documentation.
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// call_traits: defines typedefs for function usage
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// (see libs/utility/call_traits.htm)
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/* Release notes:
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23rd July 2000:
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Fixed array specialization. (JM)
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Added Borland specific fixes for reference types
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(issue raised by Steve Cleary).
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*/
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#ifndef BOOST_DETAIL_CALL_TRAITS_HPP
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#define BOOST_DETAIL_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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namespace detail{
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template <typename T, bool isp, bool b1, bool b2>
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struct ct_imp
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{
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typedef const T& param_type;
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};
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template <typename T, bool isp>
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struct ct_imp<T, isp, true, true>
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{
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typedef T const param_type;
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};
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template <typename T, bool b1, bool b2>
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struct ct_imp<T, true, b1, b2>
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{
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typedef T const param_type;
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};
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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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public:
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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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//
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// C++ Builder workaround: we should be able to define a compile time
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// constant and pass that as a single template parameter to ct_imp<T,bool>,
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// however compiler bugs prevent this - instead pass three bool's to
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// ct_imp<T,bool,bool,bool> and add an extra partial specialisation
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// of ct_imp to handle the logic. (JM)
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typedef typename detail::ct_imp<T, ::boost::is_pointer<typename remove_const<T>::type>::value, ::boost::is_arithmetic<typename remove_const<T>::type>::value, sizeof(T) <= sizeof(void*)>::param_type param_type;
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};
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template <typename T>
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struct call_traits<T&>
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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 T& param_type; // hh removed const
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};
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#if defined(__BORLANDC__) && (__BORLANDC__ <= 0x551)
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// these are illegal specialisations; cv-qualifies applied to
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// references have no effect according to [8.3.2p1],
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// C++ Builder requires them though as it treats cv-qualified
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// references as distinct types...
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template <typename T>
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struct call_traits<T&const>
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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 T& param_type; // hh removed const
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};
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template <typename T>
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struct call_traits<T&volatile>
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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 T& param_type; // hh removed const
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};
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template <typename T>
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struct call_traits<T&const volatile>
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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 T& param_type; // hh removed const
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};
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#endif
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#ifndef __SUNPRO_CC
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template <typename T, std::size_t N>
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struct call_traits<T [N]>
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{
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private:
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typedef T array_type[N];
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public:
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// degrades array to pointer:
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typedef const T* value_type;
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typedef array_type& reference;
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typedef const array_type& const_reference;
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typedef const T* const param_type;
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};
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template <typename T, std::size_t N>
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struct call_traits<const T [N]>
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{
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private:
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typedef const T array_type[N];
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public:
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// degrades array to pointer:
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typedef const T* value_type;
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typedef array_type& reference;
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typedef const array_type& const_reference;
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typedef const T* const param_type;
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};
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#endif
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}
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#endif // BOOST_DETAIL_CALL_TRAITS_HPP
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