/usr/include/octave-4.2.2/octave/lo-traits.h is in liboctave-dev 4.2.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2009-2017 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_lo_traits_h)
#define octave_lo_traits_h 1
#include "octave-config.h"
// 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 two types are equal.
template <typename T1, typename T2>
class equal_types
{
public:
static const bool value = false;
};
template <typename T>
class equal_types <T, T>
{
public:
static const bool value = true;
};
// Determine whether a type is an instance of a template.
template <template <typename> class Template, typename T>
class is_instance
{
public:
static const bool value = false;
};
template <template <typename> class Template, typename T>
class is_instance <Template, Template<T> >
{
public:
static const bool value = true;
};
// 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;
};
// Will turn TemplatedClass<T> to T, leave T otherwise.
// Useful for stripping wrapper classes, like octave_int.
template <template <typename> class TemplatedClass, typename T>
class strip_template_param
{
public:
typedef T type;
};
template <template <typename> class TemplatedClass, typename T>
class strip_template_param<TemplatedClass, TemplatedClass<T> >
{
public:
typedef T type;
};
// Will turn TemplatedClass<T> to TemplatedClass<S>, T to S otherwise.
// Useful for generic promotions.
template <template <typename> class TemplatedClass, typename T, typename S>
class subst_template_param
{
public:
typedef S type;
};
template <template <typename> class TemplatedClass, typename T, typename S>
class subst_template_param<TemplatedClass, TemplatedClass<T>, S>
{
public:
typedef TemplatedClass<S> type;
};
#endif
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