lean2/src/library/shared_environment.h

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/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include <functional>
#include "util/shared_mutex.h"
#include "kernel/environment.h"
namespace lean {
/** \brief Auxiliary object used when multiple threads are trying to populate the same environment. */
class shared_environment {
environment m_env;
mutable mutex m_mutex;
public:
shared_environment();
shared_environment(environment const & env);
/** \brief Return a copy of the current environment. This is a constant time operation. */
environment get_environment() const;
environment env() const { return get_environment(); }
/**
\brief Add the given certified declaration to the environment.
This is a constant time operation.
It blocks this object for a small amount of time.
*/
void add(certified_declaration const & d);
/**
\brief Add declaration that was not type checked.
The method throws an exception if trust_level() <= LEAN_BELIEVER_TRUST_LEVEL
It blocks this object for a small amount of time.
*/
void add(declaration const & d);
/**
\brief Replace the axiom with name <tt>t.get_declaration().get_name()</tt> with the theorem t.get_declaration().
This is a constant time operation.
It blocks this object for a small amount of time.
*/
void replace(certified_declaration const & t);
/**
\brief Update the environment using the given function.
This procedure blocks access to this object.
*/
void update(std::function<environment(environment const &)> const & f);
};
}