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Switch type environment to using pointers

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This commit is contained in:
Danila Fedorin 2020-03-24 18:04:01 -07:00
parent addfc2aa55
commit 2e74291ac9
2 changed files with 12 additions and 8 deletions
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4
10/type_env.cpp
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@ -11,6 +11,6 @@ void type_env::bind(const std::string& name, type_ptr t) {
names[name] = t;
}
type_env type_env::scope() const {
return type_env(this);
type_env_ptr type_scope(type_env_ptr parent) {
return type_env_ptr(new type_env(std::move(parent)));
}

16
10/type_env.hpp
View File

@ -2,15 +2,19 @@
#include <map>
#include "type.hpp"
struct type_env {
std::map<std::string, type_ptr> names;
type_env const* parent = nullptr;
struct type_env;
using type_env_ptr = std::shared_ptr<type_env>;
type_env(type_env const* p)
: parent(p) {}
struct type_env {
type_env_ptr parent;
std::map<std::string, type_ptr> names;
type_env(type_env_ptr p) : parent(std::move(p)) {}
type_env() : type_env(nullptr) {}
type_ptr lookup(const std::string& name) const;
void bind(const std::string& name, type_ptr t);
type_env scope() const;
};
type_env_ptr type_scope(type_env_ptr parent);