90bfd84a07
In the standard library, we should use explicit universe variables for universe polymorphic definitions. Users that want to declare universe polymorphic definitions but do not want to provide universe level parameters should use Type _ or Type*
48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
/*
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Copyright (c) 2013-2014 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 "kernel/expr.h"
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// Placeholders are used to mark locations where additional
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// metavariables should be inserted.
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namespace lean {
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/** \brief Return a new universe level placeholder. */
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level mk_level_placeholder();
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level mk_level_one_placeholder();
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enum class expr_placeholder_kind { Implicit, StrictImplicit, Explicit };
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/** \brief Return a new expression placeholder expression. */
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expr mk_expr_placeholder(optional<expr> const & type = none_expr(), expr_placeholder_kind k = expr_placeholder_kind::Implicit);
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inline expr mk_explicit_expr_placeholder(optional<expr> const & type = none_expr()) {
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return mk_expr_placeholder(type, expr_placeholder_kind::Explicit);
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}
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inline expr mk_strict_expr_placeholder(optional<expr> const & type = none_expr()) {
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return mk_expr_placeholder(type, expr_placeholder_kind::StrictImplicit);
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}
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/** \brief Return true if the given level is a placeholder. */
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bool is_placeholder(level const & e);
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bool is_one_placeholder(level const & e);
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/** \brief Return true iff the given expression is a placeholder (strict, explicit or implicit). */
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bool is_placeholder(expr const & e);
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/** \brief Return true iff the given expression is a strict placeholder. */
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bool is_strict_placeholder(expr const & e);
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/** \brief Return true iff the given expression is an explicit placeholder. */
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bool is_explicit_placeholder(expr const & e);
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/** \brief Return the type of the placeholder (if available) */
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optional<expr> placeholder_type(expr const & e);
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/** \brief Return true iff the given expression contains placeholders. */
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bool has_placeholder(expr const & e);
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void initialize_placeholder();
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void finalize_placeholder();
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}
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