69 lines
2.2 KiB
C++
69 lines
2.2 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 <algorithm>
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#include "util/debug.h"
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#include "util/name.h"
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#include "util/splay_map.h"
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#include "util/rc.h"
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#include "kernel/expr.h"
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#include "library/tactic/assignment.h"
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namespace lean {
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typedef splay_map<name, expr, name_quick_cmp> proof_map;
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/**
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\brief Return the proof for the goal named \c n in the \c proof_map \c m.
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Throw an exception if \c m does not contain a proof for \c n.
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*/
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expr find(proof_map const & m, name const & n);
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/**
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\brief Base class for functors that build a proof for the main goal based on
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the proofs of the subgoals.
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*/
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class proof_builder_cell {
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void dealloc() { delete this; }
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MK_LEAN_RC();
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public:
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proof_builder_cell():m_rc(0) {}
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virtual ~proof_builder_cell() {}
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virtual expr operator()(proof_map const & p, assignment const & a) const = 0;
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};
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template<typename F>
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class proof_builder_tpl : public proof_builder_cell {
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F m_f;
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public:
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proof_builder_tpl(F && f):m_f(f) {}
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virtual expr operator()(proof_map const & p, assignment const & a) const { return m_f(p, a); }
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};
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/**
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\brief Smart pointer for a proof builder functor.
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*/
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class proof_builder {
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protected:
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proof_builder_cell * m_ptr;
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public:
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proof_builder():m_ptr(nullptr) {}
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explicit proof_builder(proof_builder_cell * ptr):m_ptr(ptr) { lean_assert(m_ptr); m_ptr->inc_ref(); }
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proof_builder(proof_builder const & s):m_ptr(s.m_ptr) { if (m_ptr) m_ptr->inc_ref(); }
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proof_builder(proof_builder && s):m_ptr(s.m_ptr) { s.m_ptr = nullptr; }
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~proof_builder() { if (m_ptr) m_ptr->dec_ref(); }
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friend void swap(proof_builder & a, proof_builder & b) { std::swap(a.m_ptr, b.m_ptr); }
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proof_builder & operator=(proof_builder const & s) { LEAN_COPY_REF(proof_builder, s); }
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proof_builder & operator=(proof_builder && s) { LEAN_MOVE_REF(proof_builder, s); }
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expr operator()(proof_map const & p, assignment const & a) const { return m_ptr->operator()(p, a); }
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};
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template<typename F>
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proof_builder mk_proof_builder(F && f) {
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return proof_builder(new proof_builder_tpl<F>(std::forward<F>(f)));
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}
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}
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