61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
// 你不可以修改这份代码
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#pragma once
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#include <any>
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struct visitor;
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struct node {
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virtual std::any accept(visitor *) = 0;
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virtual ~node() = default;
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};
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struct num_node;
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struct add_node;
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struct sub_node;
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struct mul_node;
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struct div_node;
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struct visitor {
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virtual std::any visit(node *ctx) { return ctx->accept(this); }
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virtual std::any visit_num(num_node *) = 0;
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virtual std::any visit_add(add_node *) = 0;
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virtual std::any visit_sub(sub_node *) = 0;
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virtual std::any visit_mul(mul_node *) = 0;
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virtual std::any visit_div(div_node *) = 0;
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virtual ~visitor() = default;
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};
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struct num_node final : node {
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std::any number;
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std::any accept(visitor *ctx) override { return ctx->visit_num(this); }
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~num_node() override = default;
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};
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struct add_node final : node {
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node *lnode;
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node *rnode;
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std::any accept(visitor *ctx) override { return ctx->visit_add(this); }
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~add_node() override = default;
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};
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struct sub_node final : node {
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node *lnode;
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node *rnode;
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std::any accept(visitor *ctx) override { return ctx->visit_sub(this); }
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~sub_node() override = default;
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};
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struct mul_node final : node {
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node *lnode;
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node *rnode;
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std::any accept(visitor *ctx) override { return ctx->visit_mul(this); }
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~mul_node() override = default;
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};
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struct div_node final : node {
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node *lnode;
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node *rnode;
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std::any accept(visitor *ctx) override { return ctx->visit_div(this); }
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~div_node() override = default;
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};
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