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xo-expression: + Expression::get_free_variables()

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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/ConstantInterface.hpp
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@ -36,6 +36,10 @@ namespace xo {
// ----- Expression -----
virtual std::set<std::string> get_free_variables() const override {
return std::set<std::string>();
}
virtual void attach_envs(ref::brw<Environment> /*p*/) override {}