boost/python/detail/string_literal.hpp
// Copyright David Abrahams 2002. Permission to copy, use,
// modify, sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
#ifndef STRING_LITERAL_DWA2002629_HPP
# define STRING_LITERAL_DWA2002629_HPP
# include <cstddef>
# include <boost/type.hpp>
# include <boost/type_traits/array_traits.hpp>
# include <boost/type_traits/same_traits.hpp>
# include <boost/mpl/bool.hpp>
namespace boost { namespace python { namespace detail {
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <class T>
struct is_string_literal : mpl::false_
{
};
# if !defined(__MWERKS__) || __MWERKS__ > 0x2407
template <std::size_t n>
struct is_string_literal<char const[n]> : mpl::true_
{
};
# if (defined(__DECCXX_VER) && __DECCXX_VER <= 60590031) \
|| (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730)
// This compiler mistakenly gets the type of string literals as char*
// instead of char[NN].
template <>
struct is_string_literal<char* const> : mpl::true_
{
};
# endif
# else
// CWPro7 has trouble with the array type deduction above
template <class T, std::size_t n>
struct is_string_literal<T[n]>
: is_same<T, char const>
{
};
# endif
# else
template <bool is_array = true>
struct string_literal_helper
{
typedef char (&yes_string_literal)[1];
typedef char (&no_string_literal)[2];
template <class T>
struct apply
{
typedef apply<T> self;
static T x;
static yes_string_literal check(char const*);
static no_string_literal check(char*);
static no_string_literal check(void const volatile*);
BOOST_STATIC_CONSTANT(
bool, value = sizeof(self::check(x)) == sizeof(yes_string_literal));
typedef mpl::bool_<value> type;
};
};
template <>
struct string_literal_helper<false>
{
template <class T>
struct apply : mpl::false_
{
};
};
template <class T>
struct is_string_literal
: string_literal_helper<is_array<T>::value>::apply<T>
{
};
# endif
}}} // namespace boost::python::detail
#endif // STRING_LITERAL_DWA2002629_HPP