/usr/include/octave-3.2.4/octave/lo-traits.h is in octave3.2-headers 3.2.4-12.
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 | /*
Copyright (C) 2009 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#if !defined (octave_liboctave_traits_h)
#define octave_liboctave_traits_h 1
// Ideas for these classes taken from C++ Templates, The Complete
// Guide by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley
// (2003).
// Select a type based on the value of a constant expression.
template <bool cond, typename T1, typename T2>
class if_then_else;
template<typename T1, typename T2>
class if_then_else<true, T1, T2>
{
public:
typedef T1 result;
};
template<typename T1, typename T2>
class if_then_else<false, T1, T2>
{
public:
typedef T2 result;
};
// Determine whether a template paramter is a class type.
template<typename T1>
class is_class_type
{
private:
typedef char one;
typedef struct { char c[2]; } two;
// Classes can have pointers to members.
template<typename T2> static one is_class_type_test (int T2::*);
// Catch everything else.
template<typename T2> static two is_class_type_test (...);
public:
enum { yes = sizeof (is_class_type_test<T1> (0)) == 1 };
enum { no = ! yes };
};
// Define typename ref_param<T>::type as T const& if T is a class
// type. Otherwise, define it to be T.
template<typename T>
class ref_param
{
public:
typedef typename if_then_else<is_class_type<T>::no, T, T const&>::result type;
};
#endif
/*
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*/
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