Qt 4.8
qdatabuffer_p.h
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41 
42 #ifndef QDATABUFFER_P_H
43 #define QDATABUFFER_P_H
44 
45 //
46 // W A R N I N G
47 // -------------
48 //
49 // This file is not part of the Qt API. It exists for the convenience
50 // of other Qt classes. This header file may change from version to
51 // version without notice, or even be removed.
52 //
53 // We mean it.
54 //
55 
56 #include "QtCore/qbytearray.h"
57 
59 
60 template <typename Type> class QDataBuffer
61 {
62 public:
63  QDataBuffer(int res)
64  {
65  capacity = res;
66  if (res)
67  buffer = (Type*) qMalloc(capacity * sizeof(Type));
68  else
69  buffer = 0;
70  siz = 0;
71  }
72 
74  {
75  if (buffer)
76  qFree(buffer);
77  }
78 
79  inline void reset() { siz = 0; }
80 
81  inline bool isEmpty() const { return siz==0; }
82 
83  inline int size() const { return siz; }
84  inline Type *data() const { return buffer; }
85 
86  inline Type &at(int i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
87  inline const Type &at(int i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
88  inline Type &last() { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
89  inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
90  inline Type &first() { Q_ASSERT(!isEmpty()); return buffer[0]; }
91  inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; }
92 
93  inline void add(const Type &t) {
94  reserve(siz + 1);
95  buffer[siz] = t;
96  ++siz;
97  }
98 
99  inline void pop_back() {
100  Q_ASSERT(siz > 0);
101  --siz;
102  }
103 
104  inline void resize(int size) {
105  reserve(size);
106  siz = size;
107  }
108 
109  inline void reserve(int size) {
110  if (size > capacity) {
111  if (capacity == 0)
112  capacity = 1;
113  while (capacity < size)
114  capacity *= 2;
115  buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type));
116  }
117  }
118 
119  inline void shrink(int size) {
120  capacity = size;
121  if (size)
122  buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type));
123  else {
124  qFree(buffer);
125  buffer = 0;
126  }
127  }
128 
129  inline void swap(QDataBuffer<Type> &other) {
130  qSwap(capacity, other.capacity);
131  qSwap(siz, other.siz);
132  qSwap(buffer, other.buffer);
133  }
134 
135  inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; }
136 
137 private:
138  int capacity;
139  int siz;
141 };
142 
144 
145 #endif // QDATABUFFER_P_H
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
const Type & at(int i) const
Definition: qdatabuffer_p.h:87
Type * data() const
Definition: qdatabuffer_p.h:84
void resize(int size)
Q_CORE_EXPORT void qFree(void *ptr)
Definition: qmalloc.cpp:58
bool isEmpty() const
Definition: qdatabuffer_p.h:81
Q_CORE_EXPORT void * qMalloc(size_t size)
Definition: qmalloc.cpp:53
Q_CORE_EXPORT void * qRealloc(void *ptr, size_t size)
Definition: qmalloc.cpp:63
#define Q_ASSERT(cond)
Definition: qglobal.h:1823
void reserve(int size)
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
Type & at(int i)
Definition: qdatabuffer_p.h:86
void add(const Type &t)
Definition: qdatabuffer_p.h:93
void swap(QDataBuffer< Type > &other)
const Type & last() const
Definition: qdatabuffer_p.h:89
QDataBuffer & operator<<(const Type &t)
void qSwap(T &value1, T &value2)
Definition: qglobal.h:2181
void pop_back()
Definition: qdatabuffer_p.h:99
Type & last()
Definition: qdatabuffer_p.h:88
void shrink(int size)
Type & first()
Definition: qdatabuffer_p.h:90
const Type & first() const
Definition: qdatabuffer_p.h:91
QDataBuffer(int res)
Definition: qdatabuffer_p.h:63
void reset()
Definition: qdatabuffer_p.h:79
int size() const
Definition: qdatabuffer_p.h:83