40 lines
1 KiB
C++
40 lines
1 KiB
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 <utility>
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#include <functional>
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#include "util/buffer.h"
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#include "kernel/expr.h"
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#include "kernel/expr_sets.h"
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namespace lean {
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/**
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\brief Expression visitor.
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The argument \c F must be a lambda (function object) containing the method
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<code>
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bool operator()(expr const & e, unsigned offset)
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</code>
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The \c offset is the number of binders under which \c e occurs.
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*/
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class for_each_fn {
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std::unique_ptr<expr_cell_offset_set> m_visited;
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std::function<bool(expr const &, unsigned)> m_f; // NOLINT
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void apply(expr const & e, unsigned offset);
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public:
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template<typename F> for_each_fn(F && f):m_f(f) {}
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template<typename F> for_each_fn(F const & f):m_f(f) {}
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void operator()(expr const & e) { apply(e, 0); }
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};
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template<typename F> void for_each(expr const & e, F && f) {
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return for_each_fn(f)(e);
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}
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}
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