usr/src/cmd/man/src/util/nsgmls.src/include/Vector.h

   1 // Copyright (c) 1994, 1996 James Clark
   2 // See the file COPYING for copying permission.
   3 #pragma ident   "%Z%%M% %I%     %E% SMI"
   4
   5 #ifndef Vector_INCLUDED
   6 #define Vector_INCLUDED 1
   7
   8 #include <stddef.h>
   9 #include "xnew.h"
  10
  11 // This offers a subset of the interface offered by the standard C++
  12 // vector class as defined in the Jan 96 WP.
  13 // Code in SP currently assumes that size_type is size_t.
  14
  15 #ifdef SP_NAMESPACE
  16 namespace SP_NAMESPACE {
  17 #endif
  18
  19 template<class T>
  20 class Vector {
  21 public:
  22   typedef size_t size_type;
  23   typedef T *iterator;
  24   typedef const T *const_iterator;
  25   Vector() : ptr_(0), size_(0), alloc_(0) { }
  26   Vector(size_t n) : ptr_(0), size_(0), alloc_(0) { append(n); }
  27   ~Vector();
  28   void resize(size_t n) {
  29     if (n < size_)
  30       erase(ptr_ + n, ptr_ + size_);
  31     else if (n > size_)
  32       append(n - size_);
  33   }
  34 #ifndef NC
  35   Vector(size_t, const T &);
  36   Vector(const Vector<T> &);
  37   Vector<T> &operator=(const Vector<T> &);
  38   void assign(size_t, const T &);
  39   void push_back(const T &t) {
  40     reserve(size_ + 1);
  41     (void)new (ptr_ + size_) T(t);
  42     size_++;
  43   }
  44   void insert(const_iterator p, size_t n, const T &t);
  45   void insert(const_iterator p, const_iterator q1, const_iterator q2);
  46 #endif
  47   void swap(Vector<T> &);
  48   void clear() { erase(ptr_, ptr_ + size_); }
  49   size_t size() const { return size_; }
  50   T &operator[](size_t i) { return ptr_[i]; }
  51   const T &operator[](size_t i) const { return ptr_[i]; }
  52   iterator begin() { return ptr_; }
  53   const_iterator begin() const { return ptr_; }
  54   T &back() { return ptr_[size_ - 1]; }
  55   const T &back() const { return ptr_[size_ - 1]; }
  56   void reserve(size_t n) {  if (n > alloc_) reserve1(n); }
  57   iterator erase(const_iterator, const_iterator);
  58 private:
  59 #ifdef NC
  60   Vector(const Vector<T> &);
  61   void operator=(const Vector<T> &);
  62 #endif
  63   void append(size_t);
  64   void reserve1(size_t);
  65
  66   size_t size_;
  67   T *ptr_;
  68   size_t alloc_;                // allocated size
  69 };
  70
  71 #ifdef SP_NAMESPACE
  72 }
  73 #endif
  74
  75 #endif /* not Vector_INCLUDED */
  76
  77 #ifdef SP_DEFINE_TEMPLATES
  78 #include "Vector.cxx"
  79 #endif