src/stc/scintilla/src/SVector.h

   1 // Scintilla source code edit control
   2 // SVector.h - a simple expandable vector
   3 // Copyright 1998-1999 by Neil Hodgson <neilh@hare.net.au>
   4 // The License.txt file describes the conditions under which this software may be distributed.
   5
   6 #ifndef SVECTOR_H
   7 #define SVECTOR_H
   8
   9 // A simple expandable integer vector.
  10 // Storage not allocated for elements until an element is used.
  11 // This makes it very lightweight unless used so is a good match for optional features.
  12
  13 class SVector {
  14         int *v;
  15         unsigned int size;      // Number of elements allocated
  16         unsigned int len;       // Number of elements in vector
  17         bool allocFailure;      // A memory allocation call has failed
  18
  19         // Internally allocate more elements than the user wants to avoid
  20         // thrashng the memory allocator
  21         void SizeTo(int newSize) {
  22                 if (newSize < 4000)
  23                         newSize += 4000;
  24                 else
  25                         newSize = (newSize * 3) / 2;
  26                 int* newv = new int[newSize];
  27                 if (!newv) {
  28                         allocFailure = true;
  29                         return;
  30                 }
  31                 size = newSize;
  32                 unsigned int i=0;
  33                 for (; i<len; i++) {
  34                         newv[i] = v[i];
  35                 }
  36                 for (; i<size; i++) {
  37                         newv[i] = 0;
  38                 }
  39                 delete []v;
  40                 v = newv;
  41         }
  42
  43 public:
  44         SVector() {
  45                 allocFailure = false;
  46                 v = 0;
  47                 len = 0;
  48                 size = 0;
  49         }
  50         ~SVector() {
  51                 Free();
  52         }
  53         SVector(const SVector &other) {
  54                 allocFailure = false;
  55                 v = 0;
  56                 len = 0;
  57                 size = 0;
  58                 if (other.Length() > 0) {
  59                         SizeTo(other.Length());
  60                         if (!allocFailure) {
  61                                 for (int i=0;i<other.Length();i++)
  62                                         v[i] = other.v[i];
  63                                 len = other.Length();
  64                         }
  65                 }
  66         }
  67         SVector &operator=(const SVector &other) {
  68                 if (this != &other) {
  69                         delete []v;
  70                         allocFailure = false;
  71                         v = 0;
  72                         len = 0;
  73                         size = 0;
  74                         if (other.Length() > 0) {
  75                                 SizeTo(other.Length());
  76                                 if (!allocFailure) {
  77                                         for (int i=0;i<other.Length();i++)
  78                                                 v[i] = other.v[i];
  79                                 }
  80                                 len = other.Length();
  81                         }
  82                 }
  83                 return *this;
  84         }
  85         int &operator[](unsigned int i) {
  86                 if (i >= len) {
  87                         if (i >= size) {
  88                                 SizeTo(i);
  89                         }
  90                         len = i+1;
  91                 }
  92                 return v[i];
  93         }
  94         void Free() {
  95                 delete []v;
  96                 v = 0;
  97                 size = 0;
  98                 len = 0;
  99         }
 100         void SetLength(unsigned int newLength) {
 101                 if (newLength > len) {
 102                         if (newLength >= size) {
 103                                 SizeTo(newLength);
 104                         }
 105                 }
 106                 len = newLength;
 107         }
 108         int Length() const {
 109                 return len;
 110         }
 111 };
 112
 113 #endif