/usr/include/boost/python/detail/signature.hpp is in libboost1.49-dev 1.49.0-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #if !defined(BOOST_PP_IS_ITERATING)
// Copyright David Abrahams 2002.
// 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)
# ifndef SIGNATURE_DWA20021121_HPP
#  define SIGNATURE_DWA20021121_HPP
#  include <boost/python/type_id.hpp>
#  include <boost/python/detail/preprocessor.hpp>
#  include <boost/python/detail/indirect_traits.hpp>
#  include <boost/python/converter/pytype_function.hpp>
#  include <boost/preprocessor/iterate.hpp>
#  include <boost/preprocessor/iteration/local.hpp>
#  include <boost/mpl/at.hpp>
#  include <boost/mpl/size.hpp>
namespace boost { namespace python { namespace detail { 
struct signature_element
{
    char const* basename;
    converter::pytype_function pytype_f;
    bool lvalue;
};
struct py_func_sig_info
{
    signature_element const *signature;
    signature_element const *ret;
};
template <unsigned> struct signature_arity;
#  define BOOST_PP_ITERATION_PARAMS_1                                            \
        (3, (0, BOOST_PYTHON_MAX_ARITY + 1, <boost/python/detail/signature.hpp>))
#  include BOOST_PP_ITERATE()
// A metafunction returning the base class used for
//
//   signature<class F, class CallPolicies, class Sig>.
//
template <class Sig>
struct signature_base_select
{
    enum { arity = mpl::size<Sig>::value - 1 };
    typedef typename signature_arity<arity>::template impl<Sig> type;
};
template <class Sig>
struct signature
    : signature_base_select<Sig>::type
{
};
}}} // namespace boost::python::detail
# endif // SIGNATURE_DWA20021121_HPP
#else
# define N BOOST_PP_ITERATION()
template <>
struct signature_arity<N>
{
    template <class Sig>
    struct impl
    {
        static signature_element const* elements()
        {
            static signature_element const result[N+2] = {
                
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
# define BOOST_PP_LOCAL_MACRO(i)                                                            \
                {                                                                           \
                  type_id<BOOST_DEDUCED_TYPENAME mpl::at_c<Sig,i>::type>().name()           \
                  , &converter::expected_pytype_for_arg<BOOST_DEDUCED_TYPENAME mpl::at_c<Sig,i>::type>::get_pytype   \
                  , indirect_traits::is_reference_to_non_const<BOOST_DEDUCED_TYPENAME mpl::at_c<Sig,i>::type>::value \
                },
#else
# define BOOST_PP_LOCAL_MACRO(i)                                                            \
                {                                                                           \
                  type_id<BOOST_DEDUCED_TYPENAME mpl::at_c<Sig,i>::type>().name()           \
                  , 0 \
                  , indirect_traits::is_reference_to_non_const<BOOST_DEDUCED_TYPENAME mpl::at_c<Sig,i>::type>::value \
                },
#endif
                
# define BOOST_PP_LOCAL_LIMITS (0, N)
# include BOOST_PP_LOCAL_ITERATE()
                {0,0,0}
            };
            return result;
        }
    };
};
#endif // BOOST_PP_IS_ITERATING 
 |