libptytty/src/estl.h

#ifndef ESTL_H_
#define ESTL_H_

#include <stdlib.h>
#include <string.h>

#include "ecb.h"

template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }

template<typename T, typename U> static inline void swap (T& a, U& b) { T t = a; a = (T)b; b = (U)t; }

template <typename I, typename T>
I find (I first, I last, const T& value)
{
  while (first != last && *first != value)
    ++first;

  return first;
}

#include <new>

#if ECB_CPP11
  #include <type_traits>
#endif

// original version taken from MICO, but this has been completely rewritten
// known limitations w.r.t. std::vector
// - many methods missing
// - no error checking, no exceptions thrown (e.g. at())
// - size_type is 32bit even on 64 bit hosts, so limited to 2**31 elements
// - no allocator support
// - we don't really care about const correctness, but we try
// - we don't care about namespaces and stupid macros the user might define
// - no bool specialisation
template<class T>
struct simplevec
{
#if ESTL_BIG_VECTOR
  // should use size_t/ssize_t, but that's not portable enough for us
  typedef unsigned long size_type;
  typedef          long difference_type;
#else
  typedef uint32_t size_type;
  typedef  int32_t difference_type;
#endif

  typedef       T  value_type;
  typedef       T *iterator;
  typedef const T *const_iterator;
  typedef       T *pointer;
  typedef const T *const_pointer;
  typedef       T &reference;
  typedef const T &const_reference;
  // missing: allocator_type
  // missing: reverse iterator

private:
  size_type sze, res;
  T *buf;

  // we shamelessly optimise for "simple" types. everything
  // "not simple enough" will use the slow path.
  static bool is_simple_enough ()
  {
    #if ECB_CPP11
      return std::is_trivially_assignable<T, T>::value
          && std::is_trivially_constructable<T>::value
          && std::is_trivially_copyable<T>::value
          && std::is_trivially_destructible<T>::value;
    #elif ECB_GCC_VERSION(4,4)
      return __has_trivial_assign (T)
          && __has_trivial_constructor (T)
          && __has_trivial_copy (T)
          && __has_trivial_destructor (T);
    #else
      return 0;
    #endif
  }

  static void construct (iterator a, size_type n = 1)
  {
    if (!is_simple_enough ())
      while (n--)
        new (a++) T ();
  }

  static void destruct (iterator a, size_type n = 1)
  {
    if (!is_simple_enough ())
      while (n--)
        (*a++).~T ();
  }

  template<class I>
  static void cop_new (iterator a, I b) { new (a) T (*b); }
  template<class I>
  static void cop_set (iterator a, I b) {     *a  =  *b ; }

  // MUST copy forwards
  template<class I>
  static void copy (iterator dst, I        src, size_type n, void (*op)(iterator,        I))
  {
    while (n--)
      op (dst++, src++);
  }

  static void copy (iterator dst, iterator src, size_type n, void (*op)(iterator, iterator))
  {
    if (is_simple_enough ())
      memcpy (dst, src, sizeof (T) * n);
    else
      copy<iterator> (dst, src, n, op);
  }

  static T *alloc (size_type n) ecb_cold
  {
    return (T *)::operator new ((size_t) (sizeof (T) * n));
  }

  void dealloc () ecb_cold
  {
    destruct (buf, sze);
    ::operator delete (buf);
  }

  size_type good_size (size_type n) ecb_cold
  {
    return n ? 2UL << ecb_ld32 (n) : 5;
  }

  void ins (iterator where, size_type n)
  {
    size_type pos = where - begin ();

    if (ecb_expect_false (sze + n > res))
      {
        res = good_size (sze + n);

        T *nbuf = alloc (res);
        copy (nbuf, buf, sze, cop_new);
        dealloc ();
        buf = nbuf;
      }

    construct (buf + sze, n);

    iterator src = buf + pos;
    if (is_simple_enough ())
      memmove (src + n, src, sizeof (T) * (sze - pos));
    else
      for (size_type i = sze - pos; i--; )
        cop_set (src + n + i, src + i);

    sze += n;
  }

public:
  size_type capacity () const { return res; }
  size_type size     () const { return sze; }
  bool empty         () const { return size () == 0; }

  size_t max_size () const
  {
    return (~(size_type)0) >> 1;
  }

  const_iterator  begin () const { return &buf [      0]; }
        iterator  begin ()       { return &buf [      0]; }
  const_iterator  end   () const { return &buf [sze    ]; }
        iterator  end   ()       { return &buf [sze    ]; }
  const_reference front () const { return  buf [      0]; }
        reference front ()       { return  buf [      0]; }
  const_reference back  () const { return  buf [sze - 1]; }
        reference back  ()       { return  buf [sze - 1]; }

  void reserve (size_type sz)
  {
    if (ecb_expect_true (sz <= res))
      return;

    sz = good_size (sz);
    T *nbuf = alloc (sz);

    copy (nbuf, begin (), sze, cop_new);
    dealloc ();

    buf  = nbuf;
    res = sz;
  }

  void resize (size_type sz)
  {
    reserve (sz);

    if (is_simple_enough ())
      sze = sz;
    else
      {
        while (sze < sz) construct (buf + sze++);
        while (sze > sz) destruct  (buf + --sze);
      }
  }

  simplevec ()
  : sze(0), res(0), buf(0)
  {
  }

  simplevec (size_type n, const T &t = T ())
  {
    sze = res = n;
    buf = alloc (sze);

    while (n--)
      new (buf + n) T (t);
  }

  template<class I>
  simplevec (I first, I last)
  {
    sze = res = last - first;
    buf = alloc (sze);
    copy (buf, first, sze, cop_new);
  }

  simplevec (const simplevec<T> &v)
  : sze(0), res(0), buf(0)
  {
    sze = res = v.size ();
    buf = alloc (sze);
    copy (buf, v.begin (), sze, cop_new);
  }

  ~simplevec ()
  {
    dealloc ();
  }

  void swap (simplevec<T> &t)
  {
    ::swap (sze, t.sze);
    ::swap (res, t.res);
    ::swap (buf, t.buf);
  }

  void clear ()
  {
    destruct (buf, sze);
    sze = 0;
  }

  void push_back (const T &t)
  {
    reserve (sze + 1);
    new (buf + sze++) T (t);
  }

  void pop_back ()
  {
    destruct (buf + --sze);
  }

  const_reference operator [](size_type idx) const { return buf[idx]; }
        reference operator [](size_type idx)       { return buf[idx]; }

  const_reference at (size_type idx) const { return buf [idx]; }
        reference at (size_type idx)       { return buf [idx]; }

  template<class I>
  void assign (I first, I last)
  {
    swap (simplevec<T> (first, last));
  }

  void assign (size_type n, const T &t)
  {
    swap (simplevec<T> (n, t));
  }

  simplevec<T> &operator= (const simplevec<T> &v)
  {
    assign (v.begin (), v.end ());
    return *this;
  }

  iterator insert (iterator pos, const T &t)
  {
    size_type at = pos - begin ();

    ins (pos, 1);
    buf [at] = t;

    return buf + at;
  }

  template<class I>
  iterator insert (iterator pos, I first, I last)
  {
    size_type n  = last - first;
    size_type at = pos - begin ();

    ins (pos, n);
    copy (buf + at, first, n, cop_set);

    return buf + at;
  }

  iterator insert (iterator pos, size_type n, const T &t)
  {
    size_type at = pos - begin ();

    ins (pos, n);

    for (iterator i = buf + at; n--; )
      *i++ = t;

    return buf + at;
  }

  iterator erase (iterator first, iterator last)
  {
    size_type n = last - first;
    size_type c = end () - last;

    if (is_simple_enough ())
      memmove (first, last, sizeof (T) * c);
    else
      copy (first, last, c, cop_set);

    sze -= n;
    destruct (buf + sze, n);

    return first;
  }

  iterator erase (iterator pos)
  {
    if (pos != end ())
      erase (pos, pos + 1);

    return pos;
  }
};

template<class T>
bool operator ==(const simplevec<T> &v1, const simplevec<T> &v2)
{
  if (v1.size () != v2.size ()) return false;

  return !v1.size () || !memcmp (&v1[0], &v2[0], v1.size () * sizeof (T));
}

template<class T>
bool operator <(const simplevec<T> &v1, const simplevec<T> &v2)
{
  unsigned long minlast = min (v1.size (), v2.size ());

  for (unsigned long i = 0; i < minlast; ++i)
    {
      if (v1[i] < v2[i]) return true;
      if (v2[i] < v1[i]) return false;
    }
  return v1.size () < v2.size ();
}

template<typename T>
struct vector : simplevec<T>
{
};

#endif

Revision:	1.24
Committed:	Mon Oct 27 14:57:30 2014 UTC (9 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.23:	+1 -1 lines
Log Message:	* empty log message *
#	Content
1	#ifndef ESTL_H_
2	#define ESTL_H_
3
4	#include <stdlib.h>
5	#include <string.h>
6
7	#include "ecb.h"
8
9	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
10	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
11
12	template<typename T, typename U> static inline void swap (T& a, U& b) { T t = a; a = (T)b; b = (U)t; }
13
14	template <typename I, typename T>
15	I find (I first, I last, const T& value)
16	{
17	while (first != last && *first != value)
18	++first;
19
20	return first;
21	}
22
23	#include <new>
24
25	#if ECB_CPP11
26	#include <type_traits>
27	#endif
28
29	// original version taken from MICO, but this has been completely rewritten
30	// known limitations w.r.t. std::vector
31	// - many methods missing
32	// - no error checking, no exceptions thrown (e.g. at())
33	// - size_type is 32bit even on 64 bit hosts, so limited to 2**31 elements
34	// - no allocator support
35	// - we don't really care about const correctness, but we try
36	// - we don't care about namespaces and stupid macros the user might define
37	// - no bool specialisation
38	template<class T>
39	struct simplevec
40	{
41	#if ESTL_BIG_VECTOR
42	// should use size_t/ssize_t, but that's not portable enough for us
43	typedef unsigned long size_type;
44	typedef long difference_type;
45	#else
46	typedef uint32_t size_type;
47	typedef int32_t difference_type;
48	#endif
49
50	typedef T value_type;
51	typedef T *iterator;
52	typedef const T *const_iterator;
53	typedef T *pointer;
54	typedef const T *const_pointer;
55	typedef T &reference;
56	typedef const T &const_reference;
57	// missing: allocator_type
58	// missing: reverse iterator
59
60	private:
61	size_type sze, res;
62	T *buf;
63
64	// we shamelessly optimise for "simple" types. everything
65	// "not simple enough" will use the slow path.
66	static bool is_simple_enough ()
67	{
68	#if ECB_CPP11
69	return std::is_trivially_assignable<T, T>::value
70	&& std::is_trivially_constructable<T>::value
71	&& std::is_trivially_copyable<T>::value
72	&& std::is_trivially_destructible<T>::value;
73	#elif ECB_GCC_VERSION(4,4)
74	return __has_trivial_assign (T)
75	&& __has_trivial_constructor (T)
76	&& __has_trivial_copy (T)
77	&& __has_trivial_destructor (T);
78	#else
79	return 0;
80	#endif
81	}
82
83	static void construct (iterator a, size_type n = 1)
84	{
85	if (!is_simple_enough ())
86	while (n--)
87	new (a++) T ();
88	}
89
90	static void destruct (iterator a, size_type n = 1)
91	{
92	if (!is_simple_enough ())
93	while (n--)
94	(*a++).~T ();
95	}
96
97	template<class I>
98	static void cop_new (iterator a, I b) { new (a) T (*b); }
99	template<class I>
100	static void cop_set (iterator a, I b) { a = b ; }
101
102	// MUST copy forwards
103	template<class I>
104	static void copy (iterator dst, I src, size_type n, void (*op)(iterator, I))
105	{
106	while (n--)
107	op (dst++, src++);
108	}
109
110	static void copy (iterator dst, iterator src, size_type n, void (*op)(iterator, iterator))
111	{
112	if (is_simple_enough ())
113	memcpy (dst, src, sizeof (T) * n);
114	else
115	copy<iterator> (dst, src, n, op);
116	}
117
118	static T *alloc (size_type n) ecb_cold
119	{
120	return (T )::operator new ((size_t) (sizeof (T) n));
121	}
122
123	void dealloc () ecb_cold
124	{
125	destruct (buf, sze);
126	::operator delete (buf);
127	}
128
129	size_type good_size (size_type n) ecb_cold
130	{
131	return n ? 2UL << ecb_ld32 (n) : 5;
132	}
133
134	void ins (iterator where, size_type n)
135	{
136	size_type pos = where - begin ();
137
138	if (ecb_expect_false (sze + n > res))
139	{
140	res = good_size (sze + n);
141
142	T *nbuf = alloc (res);
143	copy (nbuf, buf, sze, cop_new);
144	dealloc ();
145	buf = nbuf;
146	}
147
148	construct (buf + sze, n);
149
150	iterator src = buf + pos;
151	if (is_simple_enough ())
152	memmove (src + n, src, sizeof (T) * (sze - pos));
153	else
154	for (size_type i = sze - pos; i--; )
155	cop_set (src + n + i, src + i);
156
157	sze += n;
158	}
159
160	public:
161	size_type capacity () const { return res; }
162	size_type size () const { return sze; }
163	bool empty () const { return size () == 0; }
164
165	size_t max_size () const
166	{
167	return (~(size_type)0) >> 1;
168	}
169
170	const_iterator begin () const { return &buf [ 0]; }
171	iterator begin () { return &buf [ 0]; }
172	const_iterator end () const { return &buf [sze ]; }
173	iterator end () { return &buf [sze ]; }
174	const_reference front () const { return buf [ 0]; }
175	reference front () { return buf [ 0]; }
176	const_reference back () const { return buf [sze - 1]; }
177	reference back () { return buf [sze - 1]; }
178
179	void reserve (size_type sz)
180	{
181	if (ecb_expect_true (sz <= res))
182	return;
183
184	sz = good_size (sz);
185	T *nbuf = alloc (sz);
186
187	copy (nbuf, begin (), sze, cop_new);
188	dealloc ();
189
190	buf = nbuf;
191	res = sz;
192	}
193
194	void resize (size_type sz)
195	{
196	reserve (sz);
197
198	if (is_simple_enough ())
199	sze = sz;
200	else
201	{
202	while (sze < sz) construct (buf + sze++);
203	while (sze > sz) destruct (buf + --sze);
204	}
205	}
206
207	simplevec ()
208	: sze(0), res(0), buf(0)
209	{
210	}
211
212	simplevec (size_type n, const T &t = T ())
213	{
214	sze = res = n;
215	buf = alloc (sze);
216
217	while (n--)
218	new (buf + n) T (t);
219	}
220
221	template<class I>
222	simplevec (I first, I last)
223	{
224	sze = res = last - first;
225	buf = alloc (sze);
226	copy (buf, first, sze, cop_new);
227	}
228
229	simplevec (const simplevec<T> &v)
230	: sze(0), res(0), buf(0)
231	{
232	sze = res = v.size ();
233	buf = alloc (sze);
234	copy (buf, v.begin (), sze, cop_new);
235	}
236
237	~simplevec ()
238	{
239	dealloc ();
240	}
241
242	void swap (simplevec<T> &t)
243	{
244	::swap (sze, t.sze);
245	::swap (res, t.res);
246	::swap (buf, t.buf);
247	}
248
249	void clear ()
250	{
251	destruct (buf, sze);
252	sze = 0;
253	}
254
255	void push_back (const T &t)
256	{
257	reserve (sze + 1);
258	new (buf + sze++) T (t);
259	}
260
261	void pop_back ()
262	{
263	destruct (buf + --sze);
264	}
265
266	const_reference operator [](size_type idx) const { return buf[idx]; }
267	reference operator [](size_type idx) { return buf[idx]; }
268
269	const_reference at (size_type idx) const { return buf [idx]; }
270	reference at (size_type idx) { return buf [idx]; }
271
272	template<class I>
273	void assign (I first, I last)
274	{
275	swap (simplevec<T> (first, last));
276	}
277
278	void assign (size_type n, const T &t)
279	{
280	swap (simplevec<T> (n, t));
281	}
282
283	simplevec<T> &operator= (const simplevec<T> &v)
284	{
285	assign (v.begin (), v.end ());
286	return *this;
287	}
288
289	iterator insert (iterator pos, const T &t)
290	{
291	size_type at = pos - begin ();
292
293	ins (pos, 1);
294	buf [at] = t;
295
296	return buf + at;
297	}
298
299	template<class I>
300	iterator insert (iterator pos, I first, I last)
301	{
302	size_type n = last - first;
303	size_type at = pos - begin ();
304
305	ins (pos, n);
306	copy (buf + at, first, n, cop_set);
307
308	return buf + at;
309	}
310
311	iterator insert (iterator pos, size_type n, const T &t)
312	{
313	size_type at = pos - begin ();
314
315	ins (pos, n);
316
317	for (iterator i = buf + at; n--; )
318	*i++ = t;
319
320	return buf + at;
321	}
322
323	iterator erase (iterator first, iterator last)
324	{
325	size_type n = last - first;
326	size_type c = end () - last;
327
328	if (is_simple_enough ())
329	memmove (first, last, sizeof (T) * c);
330	else
331	copy (first, last, c, cop_set);
332
333	sze -= n;
334	destruct (buf + sze, n);
335
336	return first;
337	}
338
339	iterator erase (iterator pos)
340	{
341	if (pos != end ())
342	erase (pos, pos + 1);
343
344	return pos;
345	}
346	};
347
348	template<class T>
349	bool operator ==(const simplevec<T> &v1, const simplevec<T> &v2)
350	{
351	if (v1.size () != v2.size ()) return false;
352
353	return !v1.size () \|\| !memcmp (&v1[0], &v2[0], v1.size () * sizeof (T));
354	}
355
356	template<class T>
357	bool operator <(const simplevec<T> &v1, const simplevec<T> &v2)
358	{
359	unsigned long minlast = min (v1.size (), v2.size ());
360
361	for (unsigned long i = 0; i < minlast; ++i)
362	{
363	if (v1[i] < v2[i]) return true;
364	if (v2[i] < v1[i]) return false;
365	}
366	return v1.size () < v2.size ();
367	}
368
369	template<typename T>
370	struct vector : simplevec<T>
371	{
372	};
373
374	#endif
375