Looking into reorganizing the Node struct.

node_pimpl.cpp

+namespace Sass {
+  
+  inline bool Node::has_children()   { return ip_->has_children; }
+  inline bool Node::has_statements() { return ip_->has_statements; }
+  inline bool Node::has_blocks()     { return ip_->has_blocks; }
+  inline bool Node::has_expansions() { return ip_->has_expansions; }
+  inline bool Node::has_backref()    { return ip_->has_backref; }
+  inline bool Node::from_variable()  { return ip_->from_variable; }
+  inline bool Node::eval_me()        { return ip_->eval_me; }
+  inline bool Node::is_unquoted()    { return ip_->is_unquoted; }
+  inline bool Node::is_numeric()     { return ip_->is_numeric(); }
+  
+  inline size_t Node::line_number()  { return ip_->line_number; }
+  
+}
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node_pimpl.hpp

+#include <string>
+
+namespace Sass {
+  using namespace std;
+  
+  class Node {
+
+  private:
+    Node_Impl* ip_;
+    
+  public:
+    bool has_children();
+    bool has_statements();
+    bool has_blocks();
+    bool has_expansions();
+    bool has_backref();
+    bool from_variable();
+    bool eval_me();
+    bool is_unquoted();
+    bool is_numeric();
+    
+    string file_name() const;
+    size_t line_number() const;
+    size_t size() const;
+    
+    Node_Impl& at(size_t i) const;
+    Node_Impl& operator[](size_t i) const;
+    Node_Impl& push_back(Node n);
+    Node_Impl& operator<<(Node n);
+  };
+}
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