bloglang/10/type_env.cpp

#include "type_env.hpp"

type_ptr type_env::lookup(const std::string& name) const {
    auto it = names.find(name);
    if(it != names.end()) return it->second;
    if(parent) return parent->lookup(name);
    return nullptr;
}

void type_env::bind(const std::string& name, type_ptr t) {
    names[name] = t;
}

type_env_ptr type_scope(type_env_ptr parent) {
    return type_env_ptr(new type_env(std::move(parent)));
}