/usr/include/polymake/internal/nothing.h is in libpolymake-dev-common 3.2r2-3.
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 | /* Copyright (c) 1997-2018
Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
http://www.polymake.org
This program 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 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
This program 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.
--------------------------------------------------------------------------------
*/
#ifndef POLYMAKE_INTERNAL_NOTHING_H
#define POLYMAKE_INTERNAL_NOTHING_H
#include "polymake/internal/type_manip.h"
namespace pm {
/// Structure denoting the absence of data
struct nothing {
void operator= (const nothing&) const { }
bool operator== (const nothing&) const { return true; }
bool operator!= (const nothing&) const { return false; }
bool operator< (const nothing&) const { return false; }
bool operator> (const nothing&) const { return false; }
bool operator<= (const nothing&) const { return true; }
bool operator>= (const nothing&) const { return true; }
};
inline void relocate(const nothing*, const nothing*) { }
template <>
struct spec_object_traits<nothing> : spec_object_traits<is_opaque> {
typedef nothing model; // prevent mixing this with any other type
};
} // end namespace pm
namespace polymake {
using pm::nothing;
}
namespace std {
/// Do nothing
inline void swap(const pm::nothing&, const pm::nothing&) { }
}
#endif // POLYMAKE_INTERNAL_NOTHING_H
// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
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