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82 lines
1.4 KiB
C++
82 lines
1.4 KiB
C++
// Copyright David Abrahams 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#ifndef IF_ELSE_DWA2002322_HPP
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# define IF_ELSE_DWA2002322_HPP
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# include <boost/config.hpp>
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namespace boost { namespace python { namespace detail {
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template <class T> struct elif_selected;
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template <class T>
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struct if_selected
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{
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template <bool b>
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struct elif : elif_selected<T>
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{
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};
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template <class U>
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struct else_
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{
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typedef T type;
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};
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};
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template <class T>
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struct elif_selected
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{
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# if !(defined(__MWERKS__) && __MWERKS__ <= 0x2407)
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template <class U> class then;
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# else
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template <class U>
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struct then : if_selected<T>
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{
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};
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# endif
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};
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# if !(defined(__MWERKS__) && __MWERKS__ <= 0x2407)
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template <class T>
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template <class U>
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class elif_selected<T>::then : public if_selected<T>
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{
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};
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# endif
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template <bool b> struct if_
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{
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template <class T>
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struct then : if_selected<T>
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{
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};
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};
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struct if_unselected
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{
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template <bool b> struct elif : if_<b>
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{
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};
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template <class U>
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struct else_
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{
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typedef U type;
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};
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};
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template <>
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struct if_<false>
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{
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template <class T>
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struct then : if_unselected
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{
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};
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};
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}}} // namespace boost::python::detail
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#endif // IF_ELSE_DWA2002322_HPP
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