expr apply(expr const & a) { auto r = m_cache.find(a); if (r != m_cache.end()) { lean_assert((*r).raw()->max_shared()); return *r; } if (a.raw()->max_shared()) { m_cache.insert(a); return a; } switch (a.kind()) { case expr_kind::Var: case expr_kind::Constant: case expr_kind::Type: case expr_kind::Value: cache(a); return a; case expr_kind::App: { expr r = update_app(a, [=](expr const & c){ return apply(c); }); cache(r); return r; } case expr_kind::Eq : { expr r = update_eq(a, [=](expr const & l, expr const & r){ return std::make_pair(apply(l), apply(r)); }); cache(r); return r; } case expr_kind::Lambda: case expr_kind::Pi: { expr r = update_abst(a, [=](expr const & t, expr const & b) { return std::make_pair(apply(t), apply(b)); }); cache(r); return r; } case expr_kind::Let: { expr r = update_let(a, [=](expr const & t, expr const & v, expr const & b) { expr new_t = t ? apply(t) : expr(); return std::make_tuple(new_t, apply(v), apply(b)); }); cache(r); return r; } case expr_kind::MetaVar: { expr r = update_metavar(a, [=](meta_entry const & e) -> meta_entry { if (e.is_inst()) return mk_inst(e.s(), apply(e.v())); else return e; }); cache(r); return r; }} lean_unreachable(); }
expr apply(expr const & a) { bool sh = false; if (is_shared(a)) { auto r = m_cache.find(a.raw()); if (r != m_cache.end()) return r->second; sh = true; } switch (a.kind()) { case expr_kind::Var: case expr_kind::Constant: case expr_kind::Type: case expr_kind::Value: return save_result(a, copy(a), sh); case expr_kind::App: { buffer<expr> new_args; for (expr const & old_arg : args(a)) new_args.push_back(apply(old_arg)); return save_result(a, mk_app(new_args), sh); } case expr_kind::HEq: return save_result(a, mk_heq(apply(heq_lhs(a)), apply(heq_rhs(a))), sh); case expr_kind::Pair: return save_result(a, mk_pair(apply(pair_first(a)), apply(pair_second(a)), apply(pair_type(a))), sh); case expr_kind::Proj: return save_result(a, mk_proj(proj_first(a), apply(proj_arg(a))), sh); case expr_kind::Lambda: return save_result(a, mk_lambda(abst_name(a), apply(abst_domain(a)), apply(abst_body(a))), sh); case expr_kind::Pi: return save_result(a, mk_pi(abst_name(a), apply(abst_domain(a)), apply(abst_body(a))), sh); case expr_kind::Sigma: return save_result(a, mk_sigma(abst_name(a), apply(abst_domain(a)), apply(abst_body(a))), sh); case expr_kind::Let: return save_result(a, mk_let(let_name(a), apply(let_type(a)), apply(let_value(a)), apply(let_body(a))), sh); case expr_kind::MetaVar: return save_result(a, update_metavar(a, [&](local_entry const & e) -> local_entry { if (e.is_inst()) return mk_inst(e.s(), apply(e.v())); else return e; }), sh); } lean_unreachable(); // LCOV_EXCL_LINE }