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xo-expression: + Expression::get_free_variables()

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This commit is contained in:
Roland Conybeare 2024-07-01 16:50:17 -04:00
commit b7db7c5454
7 changed files with 59 additions and 0 deletions
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15
include/xo/expression/IfExpr.hpp
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@ -40,6 +40,21 @@ namespace xo {
// ----- Expression -----
virtual std::set<std::string> get_free_variables() const override {
std::set<std::string> retval = test_->get_free_variables();
std::set<std::string> free_vars;
free_vars = when_true_->get_free_variables();
for (const auto & s : free_vars)
retval.insert(s);
free_vars = when_false_->get_free_variables();
for (const auto & s : free_vars)
retval.insert(s);
return retval;
}
virtual std::size_t visit_preorder(VisitFn visitor_fn) override {
std::size_t n = 1;