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859 B

#pragma once
#include <memory>
#include <map>
struct type {
virtual ~type() = default;
};
using type_ptr = std::shared_ptr<type>;
struct type_var : public type {
std::string name;
type_var(std::string n)
: name(std::move(n)) {}
};
struct type_base : public type {
std::string name;
type_base(std::string n)
: name(std::move(n)) {}
};
struct type_arr : public type {
type_ptr left;
type_ptr right;
type_arr(type_ptr l, type_ptr r)
: left(std::move(l)), right(std::move(r)) {}
};
struct type_mgr {
int last_id = 0;
std::map<std::string, type_ptr> types;
std::string new_type_name();
type_ptr new_type();
type_ptr new_arrow_type();
void unify(type_ptr l, type_ptr r);
type_ptr resolve(type_ptr t, type_var*& var);
void bind(const std::string& s, type_ptr t);
};