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