vector

UC Library Extensions UnderC comes with a pocket implementation of the standard C++ libraries, wh

// A simplified version of the std::vector class
// UnderC Development Project, 2001-2003
// *add 1.2.5 Optional range checking (controlled by -R)
// *fix 1.2.5 now uses delete[]; defines NULL if necessary.

#ifndef _VECTOR_H
#define _VECTOR_H

#ifndef NULL
#define NULL 0
#endif

#ifdef _RANGE_CHECK
#define _RC(sz,i) _range_check(sz,i)
#else
#define _RC(sz,i)
#endif

namespace std {

template <class T>
 class vector
 {
   T *m_begin;
   T *m_end;
   int m_size;
   int m_cap;
 public:
   typedef T *       iterator;
   typedef const T * const_iterator; 
   typedef T         value_type;

   iterator begin() const { return m_begin; }
   iterator end()   const { return m_end;   }
   int size()       const { return m_size; }
   int capacity()   const { return m_cap;  }

   T& operator[] (int i)  {
        _RC(m_size,i);
        return m_begin[i];
   }

   void raw_copy(T *tmp, T *old_ptr, int sz) {
     for(int i = 0; i < sz; i++) tmp[i] = old_ptr[i]; 
   }

   void alloc(int new_sz,T *old_ptr) {
     T *tmp = new T[new_sz];
  // reallocating case
     if (m_size && old_ptr==NULL && m_begin != NULL) {  
        raw_copy(tmp,m_begin,m_size);
        delete[] m_begin;
     }
    // copying case
     else if (old_ptr != NULL)
       raw_copy(tmp,old_ptr,new_sz);
     m_begin = tmp;
     m_end = m_begin + new_sz;
   }

   void copy(const vector& v) {
     m_cap  = v.m_cap;   
     m_size = v.m_size;
     alloc(v.m_size, v.m_begin);
    }

   void grow() {
      m_cap = m_size + 10;
      alloc(m_cap,NULL);
      m_end = m_begin + m_size;
    }
  
   void resize(int sz) {
      alloc(sz,NULL);
      m_cap = m_size = sz;  
   }

   void reserve(int sz) {
     alloc(sz,NULL);
     m_cap = sz;
   }      
      
   vector(int sz = 0) { 
      m_begin = NULL;
      m_size = sz;
      grow();
   }

   vector(const vector& v) {
     m_size = 0;
     m_begin = NULL;
     copy(v);
   }

   vector& operator= (const vector& v) {
     copy(v);
     return *this;
   }

   bool operator== (const vector& v) const {
     if (m_size != v.m_size) return false;
     bool equal = true;
     T *op = v.m_begin;
     for(int i = 0; i < m_size; i++)
       equal = equal && m_begin[i]==op[i];
     return equal;
   }
   
   void clear() {
      if (m_size > 0) {
        delete[] m_begin;
        m_size = 0;
        m_cap = 0;
      }
   }

   ~vector() { clear(); }

   void push_back(T t)  { 
      if (m_size+1 > m_cap) grow();
      m_size++;
      *m_end++ = t;
   }

   template <class It>
     void assign(It start, It end) {
       clear();
       for(; start != end; ++start)
         push_back(*start);
     }

   void pop_back()   { m_end--;  m_size--; }
   T back() const    { return *(m_end-1); }
   T front() const   { return *m_begin; }
   void bonzo() { }

 };

} // namespace std

#endif