86 lines
2 KiB
C
86 lines
2 KiB
C
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/* "True" vs "False" vs "Unknown".
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Copyright (C) 2019-2023 Free Software Foundation, Inc.
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Contributed by David Malcolm <dmalcolm@redhat.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_TRISTATE_H
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#define GCC_TRISTATE_H
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/* "True" vs "False" vs "Unknown". */
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class tristate {
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public:
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enum value {
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TS_UNKNOWN,
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TS_TRUE,
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TS_FALSE
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};
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tristate (enum value val) : m_value (val) {}
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tristate (bool val) : m_value (val ? TS_TRUE : TS_FALSE) {}
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static tristate unknown () { return tristate (TS_UNKNOWN); }
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const char *as_string () const;
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bool is_known () const { return m_value != TS_UNKNOWN; }
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bool is_unknown () const { return m_value == TS_UNKNOWN; }
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bool is_true () const { return m_value == TS_TRUE; }
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bool is_false () const { return m_value == TS_FALSE; }
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tristate not_ () const;
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tristate or_ (tristate other) const;
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tristate and_ (tristate other) const;
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bool operator== (const tristate &other) const
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{
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return m_value == other.m_value;
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}
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bool operator!= (const tristate &other) const
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{
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return m_value != other.m_value;
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}
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enum value get_value () const { return m_value; }
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private:
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enum value m_value;
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};
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/* Overloaded boolean operators on tristates. */
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inline tristate
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operator ! (tristate t)
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{
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return t.not_ ();
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}
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inline tristate
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operator || (tristate a, tristate b)
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{
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return a.or_ (b);
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}
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inline tristate
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operator && (tristate a, tristate b)
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{
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return a.and_ (b);
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}
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#endif /* GCC_TRISTATE_H */
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