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xo-expression: Lambda caches free var set + ::needs_closure() method

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This commit is contained in:
Roland Conybeare 2024-07-01 20:53:22 -04:00
commit 97264b726f
2 changed files with 24 additions and 8 deletions
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16
src/expression/Lambda.cpp
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@ -45,6 +45,19 @@ namespace xo {
body);
} /*make*/
std::set<std::string>
Lambda::calc_free_variables() const
{
std::set<std::string> retval
= body_->get_free_variables();
/* but remove formals. */
for (const auto & var : local_env_->argv())
retval.erase(var->name());
return retval;
} /*calc_free_variables*/
Lambda::Lambda(const std::string & name,
TypeDescr lambda_type,
const rp<LocalEnv> & local_env,
@ -64,7 +77,8 @@ namespace xo {
}
ss << ")";
type_str_ = ss.str();
this->type_str_ = ss.str();
this->free_var_set_ = this->calc_free_variables();
body_->attach_envs(local_env_);
} /*ctor*/