2 files changed, 9 insertions, 1 deletions
diff --git a/src/node.cc b/src/node.cc
index 9b76c27..0079dcb 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -22,6 +22,12 @@
 
 namespace cait::node {
 
+stringable::stringable() = default;
+
+stringable::stringable(const stringable &) = default;
+
+stringable::~stringable() = default;
+
 variable::variable(const token &variable_name,
                    std::vector<token> variable_value_list)
     : _name(variable_name), _value_list(std::move(variable_value_list)) {}
diff --git a/src/node.hh b/src/node.hh
index 919d013..992721c 100644
--- a/src/node.hh
+++ b/src/node.hh
@@ -44,8 +44,10 @@ using node_set =
 
 class stringable {
 public:
+  stringable();
+  explicit stringable(const stringable &);
+  virtual ~stringable();
   [[nodiscard]] virtual auto string() const -> std::string = 0;
-  virtual ~stringable() = default;
 };
 
 class variable : stringable {