17 lines
524 B
C++
17 lines
524 B
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include <iostream>
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namespace lean {
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/**
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\brief lifted Booleans
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*/
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enum lbool { l_false = -1, l_undef, l_true };
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inline lbool operator~(lbool lb) { return static_cast<lbool>(-static_cast<int>(lb)); }
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inline lbool to_lbool(bool b) { return static_cast<lbool>(static_cast<int>(b)*2-1); }
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std::ostream & operator<<(std::ostream & out, lbool b);
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}
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