Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef STRING_LITERAL_DWA2002629_HPP
Chris@16: # define STRING_LITERAL_DWA2002629_HPP
Chris@16: 
Chris@16: # include <cstddef>
Chris@16: # include <boost/type.hpp>
Chris@16: # include <boost/type_traits/array_traits.hpp>
Chris@16: # include <boost/type_traits/same_traits.hpp>
Chris@16: # include <boost/mpl/bool.hpp>
Chris@16: # include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace detail { 
Chris@16: 
Chris@16: # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16: template <class T>
Chris@16: struct is_string_literal : mpl::false_
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: #  if !defined(__MWERKS__) || __MWERKS__ > 0x2407
Chris@16: template <std::size_t n>
Chris@16: struct is_string_literal<char const[n]> : mpl::true_
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: #   if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590040)) \
Chris@16:   || (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730)
Chris@16: // This compiler mistakenly gets the type of string literals as char*
Chris@16: // instead of char[NN].
Chris@16: template <>
Chris@16: struct is_string_literal<char* const> : mpl::true_
Chris@16: {
Chris@16: };
Chris@16: #   endif
Chris@16: 
Chris@16: #  else
Chris@16: 
Chris@16: // CWPro7 has trouble with the array type deduction above
Chris@16: template <class T, std::size_t n>
Chris@16: struct is_string_literal<T[n]>
Chris@16:     : is_same<T, char const>
Chris@16: {
Chris@16: };
Chris@16: #  endif 
Chris@16: # else
Chris@16: template <bool is_array = true>
Chris@16: struct string_literal_helper
Chris@16: {
Chris@16:     typedef char (&yes_string_literal)[1];
Chris@16:     typedef char (&no_string_literal)[2];
Chris@16: 
Chris@16:     template <class T>
Chris@16:     struct apply
Chris@16:     {
Chris@16:         typedef apply<T> self;
Chris@16:         static T x;
Chris@16:         static yes_string_literal check(char const*);
Chris@16:         static no_string_literal check(char*);
Chris@16:         static no_string_literal check(void const volatile*);
Chris@16:         
Chris@16:         BOOST_STATIC_CONSTANT(
Chris@16:             bool, value = sizeof(self::check(x)) == sizeof(yes_string_literal));
Chris@16:         typedef mpl::bool_<value> type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template <>
Chris@16: struct string_literal_helper<false>
Chris@16: {
Chris@16:     template <class T>
Chris@16:     struct apply : mpl::false_
Chris@16:     {
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template <class T>
Chris@16: struct is_string_literal
Chris@16:     : string_literal_helper<is_array<T>::value>::apply<T>
Chris@16: {
Chris@16: };
Chris@16: # endif
Chris@16: 
Chris@16: }}} // namespace boost::python::detail
Chris@16: 
Chris@16: #endif // STRING_LITERAL_DWA2002629_HPP