89 lines
2.1 KiB
C++
89 lines
2.1 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 STRING_LITERAL_DWA2002629_HPP
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# define STRING_LITERAL_DWA2002629_HPP
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# include <cstddef>
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# include <boost/type.hpp>
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# include <boost/type_traits/array_traits.hpp>
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# include <boost/type_traits/same_traits.hpp>
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# include <boost/mpl/bool.hpp>
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# include <boost/detail/workaround.hpp>
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namespace boost { namespace python { namespace detail {
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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template <class T>
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struct is_string_literal : mpl::false_
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{
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};
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# if !defined(__MWERKS__) || __MWERKS__ > 0x2407
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template <std::size_t n>
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struct is_string_literal<char const[n]> : mpl::true_
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{
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};
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# if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590040)) \
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|| (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730)
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// This compiler mistakenly gets the type of string literals as char*
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// instead of char[NN].
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template <>
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struct is_string_literal<char* const> : mpl::true_
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{
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};
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# endif
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# else
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// CWPro7 has trouble with the array type deduction above
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template <class T, std::size_t n>
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struct is_string_literal<T[n]>
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: is_same<T, char const>
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{
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};
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# endif
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# else
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template <bool is_array = true>
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struct string_literal_helper
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{
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typedef char (&yes_string_literal)[1];
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typedef char (&no_string_literal)[2];
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template <class T>
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struct apply
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{
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typedef apply<T> self;
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static T x;
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static yes_string_literal check(char const*);
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static no_string_literal check(char*);
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static no_string_literal check(void const volatile*);
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BOOST_STATIC_CONSTANT(
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bool, value = sizeof(self::check(x)) == sizeof(yes_string_literal));
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typedef mpl::bool_<value> type;
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};
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};
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template <>
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struct string_literal_helper<false>
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{
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template <class T>
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struct apply : mpl::false_
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{
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};
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};
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template <class T>
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struct is_string_literal
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: string_literal_helper<is_array<T>::value>::apply<T>
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{
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};
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# endif
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}}} // namespace boost::python::detail
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#endif // STRING_LITERAL_DWA2002629_HPP
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