90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
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// (C) Copyright Gennadiy Rozental 2001.
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// Distributed under the Boost Software License, Version 1.0.
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// (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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// See http://www.boost.org/libs/test for the library home page.
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//
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// File : $RCSfile$
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//
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// Version : $Revision$
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//
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// Description : defines the is_cstring type trait
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// ***************************************************************************
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#ifndef BOOST_TEST_UTILS_IS_CSTRING_HPP
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#define BOOST_TEST_UTILS_IS_CSTRING_HPP
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// Boost
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#include <boost/mpl/bool.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/decay.hpp>
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#include <boost/type_traits/remove_pointer.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <string>
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//____________________________________________________________________________//
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namespace boost {
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namespace unit_test {
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// ************************************************************************** //
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// ************** is_cstring ************** //
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// ************************************************************************** //
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namespace ut_detail {
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template<typename T>
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struct is_cstring_impl : public mpl::false_ {};
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template<typename T>
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struct is_cstring_impl<T const*> : public is_cstring_impl<T*> {};
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template<typename T>
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struct is_cstring_impl<T const* const> : public is_cstring_impl<T*> {};
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template<>
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struct is_cstring_impl<char*> : public mpl::true_ {};
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template<>
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struct is_cstring_impl<wchar_t*> : public mpl::true_ {};
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template <typename T>
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struct deduce_cstring_impl {
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typedef typename boost::add_const<
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typename boost::remove_pointer<
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typename boost::decay<T>::type
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>::type
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>::type type;
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};
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template <typename T>
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struct deduce_cstring_impl< std::basic_string<T, std::char_traits<T> > > {
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// const is required here
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typedef typename boost::add_const<T>::type type;
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};
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} // namespace ut_detail
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template<typename T>
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struct is_cstring : public ut_detail::is_cstring_impl<typename decay<T>::type> {};
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template<typename T>
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struct is_cstring< std::basic_string<T, std::char_traits<T> > > : public mpl::true_ {};
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template <class T>
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struct deduce_cstring {
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typedef typename
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boost::remove_const<
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typename boost::remove_reference<T>::type
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>::type U;
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typedef typename ut_detail::deduce_cstring_impl<U>::type type;
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};
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} // namespace unit_test
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} // namespace boost
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#endif // BOOST_TEST_UTILS_IS_CSTRING_HPP
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