stop implementing moon compiler.

1 files changed, 11 insertions, 2 deletions

diff --git a/MoonParser/ast.hpp b/MoonParser/ast.hpp
index 1b40e1b..955cdc0 100644
--- a/MoonParser/ast.hpp
+++ b/MoonParser/ast.hpp
@@ -80,11 +80,20 @@ private:
 };
 
 template<class T>
-T* ast_cast(ast_node *node)
-{
+T* ast_cast(ast_node *node) {
         return node && ast_type<T>() == node->get_type() ? static_cast<T*>(node) : nullptr;
 }
 
+template <class ...Args>
+bool ast_is(ast_node* node) {
+        if (!node) return false;
+        bool result = false;
+        int type = node->get_type();
+        using swallow = bool[];
+        (void)swallow{result || (result = ast_type<Args>() == type)...};
+        return result;
+}
+
 class ast_member;