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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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4
include/xo/expression/PrimitiveInterface.hpp
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@ -48,6 +48,10 @@ namespace xo {
// ----- Expression -----
virtual std::set<std::string> get_free_variables() const override {
return std::set<std::string>();
}
virtual std::size_t visit_preorder(VisitFn visitor_fn) override {
visitor_fn(this);
return 1;