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79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/*++
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Copyright (c) 2012 Microsoft Corporation
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Module Name:
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nlsat_assignment.h
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Abstract:
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Assignment: Var -> Algebraic Number
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Author:
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Leonardo de Moura (leonardo) 2012-01-08.
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Revision History:
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--*/
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#ifndef _NLSAT_ASSIGNMENT_H_
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#define _NLSAT_ASSIGNMENT_H_
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#include"nlsat_types.h"
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#include"algebraic_numbers.h"
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namespace nlsat {
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/**
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\brief A mapping from variables to values.
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This mapping is used to encode the current partial interpretation in nlsat.
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*/
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class assignment : public polynomial::var2anum {
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scoped_anum_vector m_values;
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svector<bool> m_assigned;
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public:
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assignment(anum_manager & _m):m_values(_m) {}
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virtual ~assignment() {}
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anum_manager & am() const { return m_values.m(); }
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void swap(assignment & other) {
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m_values.swap(other.m_values);
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m_assigned.swap(other.m_assigned);
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}
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void set_core(var x, anum & v) {
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m_values.reserve(x+1, anum());
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m_assigned.reserve(x+1, false);
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m_assigned[x] = true;
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am().swap(m_values[x], v);
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}
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void set(var x, anum const & v) {
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m_values.reserve(x+1, anum());
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m_assigned.reserve(x+1, false);
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m_assigned[x] = true;
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am().set(m_values[x], v);
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}
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void reset(var x) { if (x < m_assigned.size()) m_assigned[x] = false; }
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bool is_assigned(var x) const { return m_assigned.get(x, false); }
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anum const & value(var x) const { return m_values[x]; }
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virtual anum_manager & m() const { return am(); }
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virtual bool contains(var x) const { return is_assigned(x); }
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virtual anum const & operator()(var x) const { SASSERT(is_assigned(x)); return value(x); }
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};
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/**
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\brief Wrapper for temporarily unassigning a given variable y.
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That is, given an assignment M, M' = undef_var_assignment(M, y) is identical
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to M, but y is unassigned in M'
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*/
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class undef_var_assignment : public polynomial::var2anum {
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assignment const & m_assignment;
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var m_y;
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public:
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undef_var_assignment(assignment const & a, var y):m_assignment(a), m_y(y) {}
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virtual anum_manager & m() const { return m_assignment.am(); }
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virtual bool contains(var x) const { return x != m_y && m_assignment.is_assigned(x); }
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virtual anum const & operator()(var x) const { return m_assignment.value(x); }
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};
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};
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#endif
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