struct->classes

Environment now has destructor

src/constants.hpp

@@ -4,8 +4,10 @@
 #define STATEMENT 200
 #define CALLFUNC 201
 
+class Node;
+
 // Share the line number between files
 extern int linenum;
-extern struct Node* result;
+extern Node* result;
 
 #endif

src/main.cpp

@@ -6,7 +6,7 @@
 void interpret_file(char* fileName);
 
 /* the result variable */
-struct Node* result;
+Node* result;
 
 int main(int argc, char* argv[]) {
   if (argc == 1) {
@@ -35,10 +35,8 @@ void interpret_file(char* fileName) {
 
   // Interpret the AST
   // print_tree(result, 0); // For debugging
-  struct Environment* env = new Environment();
+  Environment* env = new Environment();
   eval_statement(result, env);
-  delete_environment(env);
+  delete env;
-  // delete env;
-
   delete result;
 }

src/operations/node.cpp

@@ -8,20 +8,20 @@
 #include "../variables/variable.hpp"
 
 /* attach an existing node onto a parent */
-void attach_node(struct Node* parent, struct Node* child) {
+void attach_node(Node* parent, Node* child) {
   /* connect it */
   parent->children[parent->num_children] = child;
   parent->num_children++;
   if (parent->num_children > MAX_CHILDREN) { std::cerr << "Error, max children attached to a node" << std::endl; }
 }
 
-void check_num_nodes(struct Node* node, uint num_children, std::string error) {
+void check_num_nodes(Node* node, uint num_children, std::string error) {
   if (node && node->num_children != num_children) {
     std::cerr << "Error, " << error << std::endl;
   }
 }
 
-void print_tree(struct Node* node, uint tabs) {
+void print_tree(Node* node, uint tabs) {
   uint i;
   /* base case */
   if(!node) {
@@ -74,7 +74,7 @@ void print_tree(struct Node* node, uint tabs) {
 }
 
 
-struct Value* eval_expression(struct Node* node, struct Environment* env) {
+Value* eval_expression(Node* node, Environment* env) {
   /* base case */
   if(!node) {
     fprintf(stderr, "Error: No tree structure to evaluate\n");
@@ -83,14 +83,14 @@ struct Value* eval_expression(struct Node* node, struct Environment* env) {
 
   // Needed if we are going to take input from the user
   double temp;
-  struct Variable* var = nullptr;
+  Variable* var = nullptr;
-  struct Environment* local_env = nullptr;
+  Environment* local_env = nullptr;
-  struct Node* tempNode = nullptr;
+  Node* tempNode = nullptr;
-  struct Value* tempVal = nullptr;
+  Value* tempVal = nullptr;
 
   // Evaluate subexpressions if existent and node is not a lambda expression
-  struct Value* val1 = nullptr;
+  Value* val1 = nullptr;
-  struct Value* val2 = nullptr;
+  Value* val2 = nullptr;
   // struct Value* val3 = nullptr;
   if (node->num_children > 0 && node->type != LAMBDATAG) {
     val1 = eval_expression(node->children[0], env);
@@ -112,8 +112,7 @@ struct Value* eval_expression(struct Node* node, struct Environment* env) {
         new Variable(tempNode->children[0]->id, // Get the name of the variable needed for the lambda expression
           eval_expression(node->children[1], env)));
       tempVal =  eval_expression(tempNode->children[1], local_env);
-      delete_environment(local_env);
+      delete local_env;
-      // delete local_env;
       return tempVal;
       break;
     case PLUS:
@@ -222,14 +221,14 @@ struct Value* eval_expression(struct Node* node, struct Environment* env) {
 }
 
 
-void eval_statement(struct Node* node, struct Environment* env) {
+void eval_statement(Node* node, Environment* env) {
   /* base case */
   if(!node) {
     fprintf(stderr, "Error: No tree structure to evaluate\n");
     return;
   }
 
-  struct Value* tempVal;
+  Value* tempVal;
 
   switch(node->type) {
     case ASSIGN:

src/operations/node.hpp

@@ -3,33 +3,38 @@
 
 #include <string>
 #include <array>
+#include <iostream>
 #include "../variables/value.hpp"
 #include "../variables/environment.hpp"
 
 #define MAX_CHILDREN 3
 
+class Value;
+class Environment;
+
 /* a tree node definition */
-struct Node {
+class Node {
+  public:
   int type;
-  struct Value* value;
+  Value* value;
 
   /* the id of the node (used for identifiers only) */
   std::string id;
 
   /* at most three children nodes */
   uint num_children;
-  std::array<struct Node*, MAX_CHILDREN> children;
+  std::array<Node*, MAX_CHILDREN> children;
   
-  Node(int t, struct Value* v, std::string s) {
+  Node(int t, Value* v, std::string s) {
     type = t;
     value = v;
     id = s;
+    num_children = 0;
     for (uint i = 0; i < MAX_CHILDREN; i++) {
       children[i] = nullptr;
     }
   }
   ~Node() {
-    if (value) { delete value; }
     // delete value;
     for (uint i = 0; i < num_children; i++) {
       delete children[i];
@@ -39,11 +44,11 @@ struct Node {
 
 // Abstract Syntax Tree Functions
 // struct Node* make_node(int type, struct Value* value, std::string id);
-void attach_node(struct Node* parent, struct Node* child);
+void attach_node(Node* parent, Node* child);
-void print_tree(struct Node* node, int tabs);
+void print_tree(Node* node, int tabs);
 
 // Interpreting AST
-void eval_statement(struct Node* node, struct Environment* env);
+void eval_statement(Node* node, Environment* env);
-struct Value* eval_expression(struct Node* node, struct Environment* env);
+Value* eval_expression(Node* node, Environment* env);
 
 #endif

src/operations/operators.cpp

@@ -2,14 +2,14 @@
 #include "operators.hpp"
 #include "../variables/value.hpp"
 
-struct Value* add(struct Value* x, struct Value* y) {
+Value* add(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in add." << std::endl; }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot add a boolean." << std::endl; }
   if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
     std::cerr << "Error, cannot add a string with another data type." << std::endl;
   }
   
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -27,12 +27,12 @@ struct Value* add(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* subtract(struct Value* x, struct Value* y) {
+Value* subtract(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in subtract." << std::endl; }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot subtract a boolean." << std::endl; }
   if (x->type == STRING || y->type == STRING) { std::cerr << "Error, cannot subtract a string." << std::endl; }
   
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -48,12 +48,12 @@ struct Value* subtract(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* division(struct Value* x, struct Value* y) {
+Value* division(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in divide." << std::endl;  }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot divide a boolean." << std::endl;  }
   if (x->type == STRING || y->type == STRING) { std::cerr << "Error, cannot division a string." << std::endl;  }
   
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -69,12 +69,12 @@ struct Value* division(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* multiplication(struct Value* x, struct Value* y) {
+Value* multiplication(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in multiply." << std::endl;  }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot multiply a boolean." << std::endl;  }
   if (x->type == STRING || y->type == STRING) { std::cerr << "Error, cannot multiply a string." << std::endl;  }
   
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -90,14 +90,14 @@ struct Value* multiplication(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* less(struct Value* x, struct Value* y) {
+Value* less(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in <." << std::endl;  }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot numerically compare a boolean." << std::endl;  }
     if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
       std::cerr << "Error, cannot compare a string with another data type." << std::endl; 
   }
 
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -115,14 +115,14 @@ struct Value* less(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* greater(struct Value* x, struct Value* y) {
+Value* greater(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in greater." << std::endl;  }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot numerically compare a boolean." << std::endl;  }
     if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
       std::cerr << "Error, cannot compare a string with another data type." << std::endl; 
   }
 
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -140,14 +140,14 @@ struct Value* greater(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* less_equal(struct Value* x, struct Value* y) {
+Value* less_equal(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in <=." << std::endl;  }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot numerically compare a boolean." << std::endl;  }
     if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
       std::cerr << "Error, cannot compare a string with another data type." << std::endl; 
   }
 
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -165,14 +165,14 @@ struct Value* less_equal(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* greater_equal(struct Value* x, struct Value* y) {
+Value* greater_equal(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in >=." << std::endl;  }
   if (x->type == BOOLEAN || y->type == BOOLEAN) { std::cerr << "Error, cannot numerically compare a boolean." << std::endl;  }
     if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
       std::cerr << "Error, cannot compare a string with another data type." << std::endl; 
   }
 
-  struct Value* ans;
+  Value* ans;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -190,13 +190,13 @@ struct Value* greater_equal(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* equals(struct Value* x, struct Value* y) {
+Value* equals(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in ==." << std::endl;  }
   if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
     std::cerr << "Error, cannot compare a string with another data type." << std::endl; 
   }
   
-  struct Value* ans = nullptr;
+  Value* ans = nullptr;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -218,13 +218,13 @@ struct Value* equals(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* not_equals(struct Value* x, struct Value* y) {
+Value* not_equals(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in !=." << std::endl;  }
   if ((x->type == STRING || y->type == STRING) && (x->type != STRING || y->type != STRING)) {
     std::cerr << "Error, cannot compare a string with another data type." << std::endl; 
   }
   
-  struct Value* ans= nullptr;
+  Value* ans= nullptr;
 
   // Destruct all four cases
   if (x->type == LONG && y->type == LONG) {
@@ -246,7 +246,7 @@ struct Value* not_equals(struct Value* x, struct Value* y) {
   return ans;
 }
 
-struct Value* and_value(struct Value* x, struct Value* y) {
+Value* and_value(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in &&." << std::endl;  }
   if (x->type != BOOLEAN || y->type != BOOLEAN) { std::cerr << "Error, cannot use and AND operation with a non-boolean." << std::endl;  }
   if (x->type == STRING || y->type == STRING) { std::cerr << "Error, cannot AND a string." << std::endl;  }
@@ -254,7 +254,7 @@ struct Value* and_value(struct Value* x, struct Value* y) {
   return make_boolean(get_long(x) && get_long(y));
 }
 
-struct Value* or_value(struct Value* x, struct Value* y) {
+Value* or_value(Value* x, Value* y) {
   if (!x || !y) { std::cerr << "Error, uninitialized values being used in ||." << std::endl;  }
   if (x->type != BOOLEAN || y->type != BOOLEAN) { std::cerr << "Error, cannot use and OR operation with a non-boolean." << std::endl;  }
   if (x->type == STRING || y->type == STRING) { std::cerr << "Error, cannot OR a string." << std::endl;  }
@@ -262,7 +262,7 @@ struct Value* or_value(struct Value* x, struct Value* y) {
   return make_boolean(get_long(x) || get_long(y));
 }
 
-struct Value* not_value(struct Value* x) {
+Value* not_value(Value* x) {
   if (!x) { std::cerr << "Error, uninitialized values being used in !." << std::endl;  }
   if (x->type != BOOLEAN) { std::cerr << "Error, cannot NOT a non-boolean." << std::endl;  }
   if (x->type == STRING) { std::cerr << "Error, cannot negate a string." << std::endl;  }

src/operations/operators.hpp

@@ -2,18 +2,18 @@
 #define OPERATORS_H
 #include "../variables/value.hpp"
 
-struct Value* add(struct Value* x, struct Value* y);
+Value* add(Value* x, Value* y);
-struct Value* subtract(struct Value* x, struct Value* y);
+Value* subtract(Value* x, Value* y);
-struct Value* division(struct Value* x, struct Value* y);
+Value* division(Value* x, Value* y);
-struct Value* multiplication(struct Value* x, struct Value* y);
+Value* multiplication(Value* x, Value* y);
-struct Value* less(struct Value* x, struct Value* y);
+Value* less(Value* x, Value* y);
-struct Value* greater(struct Value* x, struct Value* y);
+Value* greater(Value* x, Value* y);
-struct Value* less_equal(struct Value* x, struct Value* y);
+Value* less_equal(Value* x, Value* y);
-struct Value* greater_equal(struct Value* x, struct Value* y);
+Value* greater_equal(Value* x, Value* y);
-struct Value* equals(struct Value* x, struct Value* y);
+Value* equals(Value* x, Value* y);
-struct Value* not_equals(struct Value* x, struct Value* y);
+Value* not_equals(Value* x, Value* y);
-struct Value* and_value(struct Value* x, struct Value* y);
+Value* and_value(Value* x, Value* y);
-struct Value* or_value(struct Value* x, struct Value* y);
+Value* or_value(Value* x, Value* y);
-struct Value* not_value(struct Value* x);
+Value* not_value(Value* x);
 
 #endif

src/shell.cpp

@@ -48,7 +48,7 @@ void start_shell() {
     printf("Welcome to SLOTH Version 0.0.1\n");
     printf("Press CTRL+C to Exit\n");
 
-    struct Environment* env = new Environment();
+    Environment* env = new Environment();
     while (1) {
         // Read line from user and input it into the history
         char* input = readline("sloth> ");
@@ -69,7 +69,6 @@ void start_shell() {
         eval_statement(result, env);
     }
 
-    delete_environment(env);
+    delete env;
-    // delete env;
     delete result;
 }

src/variables/environment.cpp

@@ -4,7 +4,7 @@
 #include "environment.hpp"
 #include "variable.hpp"
 
-struct Variable* find_variable(struct Environment* env, std::string id) {
+Variable* find_variable(Environment* env, std::string id) {
   auto result = std::find_if(env->vars.begin(), env->vars.end(), 
     [id](const Variable* element) {
         return element->id == id;
@@ -17,9 +17,9 @@ struct Variable* find_variable(struct Environment* env, std::string id) {
   return nullptr;
 }
 
-void add_variable(struct Environment* env, struct Variable* var) {
+void add_variable(Environment* env, Variable* var) {
   // If variable exists, replace it
-  struct Variable* temp_var = find_variable(env, var->id);
+  Variable* temp_var = find_variable(env, var->id);
   if (temp_var != nullptr) {
     temp_var->value = var->value;
     free(var);
@@ -30,9 +30,3 @@ void add_variable(struct Environment* env, struct Variable* var) {
   env->vars.push_back(var);
 }
 
-void delete_environment(struct Environment* env) {
-  for (uint i = 0; i < size(env->vars); i++) {
-    free(env->vars[i]);
-  }
-  free(env);
-}

src/variables/environment.hpp

@@ -5,19 +5,21 @@
 #include <string>
 #include <vector>
 
-struct Environment {
+class Variable;
-  std::vector<struct Variable*> vars;
+
+class Environment {
+  public:
+  std::vector<Variable*> vars;
   Environment() {  }
-  // ~Environment() { 
+  ~Environment() { 
-  //   for (uint i = 0; i < size(vars); i++) {
+    for (uint i = 0; i < size(vars); i++) {
-  //       delete vars[i];
+        delete vars[i];
-  //   }
+    }
-  // }
+  }
 };
 
 // Variable Lookup Functions
-void delete_environment(struct Environment* env);
+Variable* find_variable(Environment* env, std::string id);
-struct Variable* find_variable(struct Environment* env, std::string id);
+void add_variable(Environment* env, Variable* var);
-void add_variable(struct Environment* env, struct Variable* var);
 
 #endif

src/variables/value.cpp

@@ -2,65 +2,74 @@
 #include "value.hpp"
 #include <string>
 #include <iostream>
+#include <variant>
 #include "../parser/parser.tab.h"
 
-struct Value* make_long(long num) {
+Value* make_long(long num) {
   return new Value(LONG, num, 0, nullptr, "");
 }
-struct Value* make_double(double dec) {
+Value* make_double(double dec) {
   return new Value(DOUBLE, 0, dec, nullptr, "");
 }
-struct Value* make_true() {
+Value* make_true() {
   return new Value(BOOLEAN, 1, 0, nullptr, "");
 }
-struct Value* make_false() {
+Value* make_false() {
   return new Value(BOOLEAN, 0, 0, nullptr, "");
 }
-struct Value* make_boolean(int x) {
+Value* make_boolean(int x) {
   return (x)? make_true() : make_false();
 }
-struct Value* make_expression(struct Node* expr) {
+Value* make_expression(Node* expr) {
   return new Value(LAMBDA, 0, 0, expr, "");
 }
-struct Value* make_string(std::string str) {
+Value* make_string(std::string str) {
   return new Value(STRING, 0, 0, nullptr, str);
 }
 
-void delete_value(struct Value* val) {
+void delete_value(Value* val) {
   free(val);
 }
 
-long get_long(struct Value* val) {
+long get_long(Value* val) {
-  return val->value.num;
+  // return val->value.num;
+  return std::get<long>(val->val);
 }
-double get_double(struct Value* val) {
+double get_double(Value* val) {
-  return val->value.dec;
+  // return val->value.dec;
+  return std::get<double>(val->val);
 }
-struct Node* get_expression(struct Value* val) {
+Node* get_expression(Value* val) {
-  return val->value.expr;
+  // return val->value.expr;
+  return std::get<Node*>(val->val);
 }
-std::string get_string(struct Value* val) {
+std::string get_string(Value* val) {
-  return val->value.str;
+  // return val->value.str;
+  return std::get<std::string>(val->val);
 }
 
-void set_long(struct Value* val, long num) {
+void set_long(Value* val, long num) {
   val->type = LONG;
-  val->value.num = num;
+  // val->value.num = num;
+  val->val = num;
 }
-void set_double(struct Value* val, double dec) {
+void set_double(Value* val, double dec) {
   val->type = DOUBLE;
-  val->value.dec = dec;
+  // val->value.dec = dec;
+  val->val = dec;
 }
-void set_expression(struct Value* val, struct Node* expr) {
+void set_expression(Value* val, Node* expr) {
   val->type = LAMBDA;
-  val->value.expr = expr;
+  // val->value.expr = expr;
+  val->val = expr;
 }
-void set_sring(struct Value* val, std::string str) {
+void set_sring(Value* val, std::string str) {
   val->type = STRING;
-  val->value.str = str;
+  // val->value.str = str;
+  val->val = str;
 }
 
-void print_value(struct Value* val) {
+void print_value(Value* val) {
   if (val->type == BOOLEAN) {
     if (get_long(val)) {
       std::cout << "true";

src/variables/value.hpp

@@ -1,36 +1,38 @@
 #ifndef VALUE_H
 #define VALUE_H
 
+#include "../operations/node.hpp"
+#include <iostream>
 #include <string>
+#include <variant>
+
+class Node;
 
 enum TypeTag { DOUBLE, LONG, BOOLEAN, STRING, LAMBDA };
 
-union TypeVal {
+class Value {
-  long num;
+  public:
-  double dec;
-  struct Node* expr;
-  std::string str;
-  TypeVal() { new(&str) std::string(); new(expr) struct Node*; } 
-  ~TypeVal() { free(&str); free(expr); }
-};
-
-struct Value {
     enum TypeTag type;
-  TypeVal value;
+    std::variant<long, double, Node*, std::string> val;
-  // Broken implemenation of constructor below
+
-  Value(TypeTag t, long n, double d, struct Node* e, std::string s) {
+    Value(TypeTag t, long n, double d, Node* e, std::string s) {
       /* set properties */
       type = t;
+      
       if (type == LONG || type == BOOLEAN) {
-      value.num = n;
+        val = n;
       } else if (type == DOUBLE){ // Assume DOUBLE
-      value.dec = d;
+        val = d;
       } else if (type == STRING) {
-      value.str = s;  
+        val = s;  
       } else { // Assume lambda expression
-      value.expr = e;
+        val = e;
       }
     }
+
+  ~Value() {  
+    std::cout << "VALUE DESTROYED" << std::endl;
+  }
 };
 
 // Constructors

src/variables/variable.cpp

@@ -2,12 +2,12 @@
 #include <string>
 #include "variable.hpp"
 
-void set_value(struct Variable* var, struct Value* value) {
+void set_value(Variable* var, Value* value) {
   if (!var) { std::cerr << "Error: Invalid Variable" << std::endl; return; }
   var->value = value;
 }
 
-struct Value* get_value(struct Variable* var) {
+Value* get_value(Variable* var) {
   if (!var) { std::cerr << "Error: Invalid Variable" << std::endl; return 0; }
   return var->value;
 }

src/variables/variable.hpp

@@ -2,26 +2,33 @@
 #define VARIABLE_H
 
 #include <string>
-#include "../operations/node.hpp"
+#include "../variables/value.hpp"
 
-struct Variable {
+class Value;
+class Node;
+
+class Variable {
+  public:
   std::string id;
-  struct Value* value;
+  Value* value;
 
-  Variable(std::string s, struct Value* val) {
+  Variable(std::string s, Value* val) {
     id = s;
     value = val;
   }
+  ~Variable() {
+    delete value;
+  }
 };
 
 // Variable Functions
-void set_value(struct Variable* var, struct Value* value);
+void set_value(Variable* var, Value* value);
-struct Value* get_value(struct Variable* var);
+Value* get_value(Variable* var);
-struct Value* make_long(long num);
+Value* make_long(long num);
-struct Value* make_double(double dec);
+Value* make_double(double dec);
-struct Value* make_true();
+Value* make_true();
-struct Value* make_false();
+Value* make_false();
-struct Value* make_boolean(int x);
+Value* make_boolean(int x);
-struct Value* make_expression(struct Node* expr);
+Value* make_expression(Node* expr);
 
 #endif