value_stack.cpp

/*
 * Implementation of the ValueStack class.
 * Represents an operand stack for a client connection.
 * 
 * CSF Assignment 5
 * 
 * Ifrah Attar - iattar1@jh.edu
 * Morgan Huberty - mhubert3@jh.edu
 * 
 */

 #include "value_stack.h"
 #include "exceptions.h"
 
 /**
  * @brief Constructs a new, empty ValueStack object.
  */
 ValueStack::ValueStack()
 {
 }
 
 /**
  * @brief Destroys the ValueStack object.
  */
 ValueStack::~ValueStack()
 {
 }
 
 /**
  * @brief Checks if the stack is empty.
  * @return True if the stack is empty, false otherwise.
  */
 bool ValueStack::is_empty() const
 {
   return stack.empty();
 }
 
 /**
  * @brief Pushes a value onto top of the stack.
  * @param value The string value to push.
  */
 void ValueStack::push( const std::string &value )
 {
   stack.push_back(value);
 }
 
 /**
  * @brief Gets the value at the top of the stack without removing it.
  * @return Value at the top of the stack.
  * @throw OperationException if the stack is empty.
  */
 std::string ValueStack::get_top() const
 {
   if (is_empty()) {
     throw OperationException("Stack is empty");
   }
   return stack.back();
 }
 
 /**
  * @brief Removes value from the top of the stack.
  * @throw OperationException if the stack is empty.
  */
 void ValueStack::pop()
 {
   if (is_empty()) {
     throw OperationException("Stack is empty");
   }
   stack.pop_back();
 }