44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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Copyright (c) 2013 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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#include <memory>
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#include "level.h"
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namespace lean {
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/**
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\brief Lean environment for defining constants, inductive
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datatypes, universe variables, et.c
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*/
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class environment {
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struct imp;
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std::unique_ptr<imp> m_imp;
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public:
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environment();
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~environment();
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/**
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\brief Define a new universe variable with name \c n and constraint <tt>n >= l</tt>.
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Return the new variable.
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\remark An exception is thrown if a universe inconsistency is detected.
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*/
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level define_uvar(name const & n, level const & l);
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level define_uvar(name const & n) { return define_uvar(n, level()); }
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level define_uvar(char const * n, level const & l) { return define_uvar(name(n), l); }
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level define_uvar(char const * n) { return define_uvar(name(n), level()); }
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/**
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\brief Return true iff the constraint l1 >= l2 is implied by the constraints
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in the environment.
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*/
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bool is_implied(level const & l1, level const & l2) const;
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void display_uvars(std::ostream & out) const;
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};
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}
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