f97c260b0b
The environment object is a "smart-pointer".
Before this commit, the use of "const &" for environment objects was broken.
For example, suppose we have a function f that should not modify the input environment.
Before this commit, its signature would be
void f(environment const & env)
This is broken, f's implementation can easilty convert it to a read-write pointer by using
the copy constructor.
environment rw_env(env);
Now, f can use rw_env to update env.
To fix this issue, we now have ro_environment. It is a shared *const* pointer.
We can convert an environment into a ro_environment, but not the other way around.
ro_environment can also be seen as a form of documentation.
For example, now it is clear that type_inferer is not updating the environment, since its constructor takes a ro_environment.
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
32 lines
924 B
C++
32 lines
924 B
C++
/*
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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 <memory>
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#include "kernel/expr.h"
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#include "kernel/environment.h"
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#include "kernel/context.h"
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namespace lean {
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class environment;
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class options;
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/** \brief Functional object for normalizing expressions */
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class normalizer {
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class imp;
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std::unique_ptr<imp> m_ptr;
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public:
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normalizer(ro_environment const & env);
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normalizer(ro_environment const & env, unsigned max_depth);
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normalizer(ro_environment const & env, options const & opts);
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~normalizer();
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expr operator()(expr const & e, context const & ctx = context());
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void clear();
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};
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/** \brief Normalize \c e using the environment \c env and context \c ctx */
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expr normalize(expr const & e, ro_environment const & env, context const & ctx = context());
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}
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