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
  // shoudl 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);

    sze += n;

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

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<iterator> (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:	1.21
Committed:	Thu Oct 23 20:21:52 2014 UTC (9 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.20:	+2 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.4	#ifndef ESTL_H_
2			#define ESTL_H_
3	sf-exg	1.2
4	sf-exg	1.1	#include <stdlib.h>
5			#include <string.h>
6
7	root	1.9	#include "ecb.h"
8
9	sf-exg	1.5	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	sf-exg	1.1
12	root	1.3	template<typename T, typename U> static inline void swap (T& a, U& b) { T t = a; a = (T)b; b = (U)t; }
13	sf-exg	1.1
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	root	1.8	#include <new>
24
25	root	1.21	#if ECB_CPP11
26	root	1.8	#include <type_traits>
27			#endif
28
29	root	1.9	// original version taken from MICO, but this has been completely rewritten
30			// known limitations w.r.t. std::vector
31			// - many methods missing
32	root	1.12	// - no error checking, no exceptions thrown (e.g. at())
33	root	1.9	// - 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	root	1.12	// - no bool specialisation
38	sf-exg	1.1	template<class T>
39			struct simplevec
40			{
41	root	1.9	#if ESTL_BIG_VECTOR
42			// shoudl 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	root	1.3	typedef const T *const_iterator;
53	root	1.9	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	sf-exg	1.1
64	root	1.9	// we shamelessly optimise for "simple" types. everything
65			// "not simple enough" will use the slow path.
66	root	1.8	static bool is_simple_enough ()
67			{
68	root	1.21	#if ECB_CPP11
69	root	1.8	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	root	1.9	static void construct (iterator a, size_type n = 1)
84	root	1.3	{
85	root	1.9	if (!is_simple_enough ())
86			while (n--)
87	sf-exg	1.17	new (a++) T ();
88	root	1.3	}
89
90	root	1.9	static void destruct (iterator a, size_type n = 1)
91	root	1.3	{
92	root	1.8	if (!is_simple_enough ())
93	root	1.9	while (n--)
94			(*a++).~T ();
95	root	1.3	}
96
97	root	1.11	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	root	1.14	// MUST copy forwards
103	root	1.11	template<class I>
104	root	1.15	static void copy (iterator dst, I src, size_type n, void (*op)(iterator, I))
105	root	1.11	{
106	root	1.13	while (n--)
107			op (dst++, src++);
108	root	1.11	}
109
110	root	1.15	static void copy (iterator dst, iterator src, size_type n, void (*op)(iterator, iterator))
111	root	1.8	{
112			if (is_simple_enough ())
113			memcpy (dst, src, sizeof (T) * n);
114			else
115	root	1.11	copy<iterator> (dst, src, n, op);
116	root	1.9	}
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	root	1.8	}
133
134			void ins (iterator where, size_type n)
135	root	1.3	{
136	root	1.9	size_type pos = where - begin ();
137
138			if (ecb_expect_false (sze + n > res))
139	root	1.3	{
140	root	1.9	res = good_size (sze + n);
141	root	1.3
142	root	1.9	T *nbuf = alloc (res);
143			copy (nbuf, buf, sze, cop_new);
144			dealloc ();
145			buf = nbuf;
146	root	1.3	}
147	root	1.9
148			construct (buf + sze, n);
149	root	1.14
150	root	1.9	sze += n;
151	root	1.14
152			iterator src = buf + pos;
153			if (is_simple_enough ())
154			memmove (src + n, src, sizeof (T) * n);
155			else
156			for (size_type i = n; i--; )
157	sf-exg	1.17	cop_set (src + n + i, src + i);
158	root	1.3	}
159	sf-exg	1.1
160			public:
161	root	1.9	size_type capacity () const { return res; }
162			size_type size () const { return sze; }
163			bool empty () const { return size () == 0; }
164
165	root	1.11	size_t max_size () const
166			{
167			return (~(size_type)0) >> 1;
168			}
169
170	root	1.9	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	root	1.3	void reserve (size_type sz)
180			{
181	root	1.9	if (ecb_expect_true (sz <= res))
182			return;
183	root	1.3
184	root	1.9	sz = good_size (sz);
185			T *nbuf = alloc (sz);
186	root	1.3
187	root	1.15	copy (nbuf, begin (), sze, cop_new);
188	root	1.9	dealloc ();
189
190			buf = nbuf;
191			res = sz;
192	root	1.3	}
193
194	root	1.7	void resize (size_type sz)
195			{
196			reserve (sz);
197	root	1.8
198			if (is_simple_enough ())
199	root	1.9	sze = sz;
200	root	1.8	else
201			{
202	root	1.9	while (sze < sz) construct (buf + sze++);
203			while (sze > sz) destruct (buf + --sze);
204	root	1.8	}
205	root	1.7	}
206
207	root	1.3	simplevec ()
208	root	1.9	: sze(0), res(0), buf(0)
209	root	1.3	{
210			}
211
212	root	1.9	simplevec (size_type n, const T &t = T ())
213	root	1.3	{
214	root	1.11	sze = res = n;
215			buf = alloc (sze);
216
217			while (n--)
218			new (buf + n) T (t);
219	root	1.3	}
220
221	root	1.11	template<class I>
222			simplevec (I first, I last)
223	root	1.3	{
224	root	1.11	sze = res = last - first;
225			buf = alloc (sze);
226	root	1.15	copy (buf, first, sze, cop_new);
227	root	1.3	}
228
229			simplevec (const simplevec<T> &v)
230	root	1.9	: sze(0), res(0), buf(0)
231	root	1.3	{
232	root	1.11	sze = res = v.size ();
233			buf = alloc (sze);
234	root	1.15	copy (buf, v.begin (), sze, cop_new);
235	root	1.3	}
236
237			~simplevec ()
238			{
239	root	1.8	dealloc ();
240	root	1.3	}
241
242	root	1.9	void swap (simplevec<T> &t)
243	root	1.3	{
244	root	1.9	::swap (sze, t.sze);
245			::swap (res, t.res);
246			::swap (buf, t.buf);
247	root	1.3	}
248
249			void clear ()
250			{
251	root	1.9	destruct (buf, sze);
252			sze = 0;
253	root	1.3	}
254
255			void push_back (const T &t)
256			{
257	root	1.9	reserve (sze + 1);
258			new (buf + sze++) T (t);
259	root	1.3	}
260
261			void pop_back ()
262			{
263	root	1.9	destruct (buf + --sze);
264	root	1.3	}
265
266	root	1.11	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	root	1.3
289			iterator insert (iterator pos, const T &t)
290			{
291	root	1.8	size_type at = pos - begin ();
292	root	1.10
293	root	1.8	ins (pos, 1);
294	root	1.10	buf [at] = t;
295
296			return buf + at;
297	root	1.3	}
298
299	root	1.11	template<class I>
300			iterator insert (iterator pos, I first, I last)
301	root	1.3	{
302	root	1.8	size_type n = last - first;
303			size_type at = pos - begin ();
304	root	1.3
305	root	1.9	ins (pos, n);
306	root	1.10	copy (buf + at, first, n, cop_set);
307	root	1.3
308	root	1.10	return buf + at;
309	root	1.3	}
310
311			iterator insert (iterator pos, size_type n, const T &t)
312			{
313	root	1.8	size_type at = pos - begin ();
314	root	1.3
315	root	1.9	ins (pos, n);
316
317	root	1.10	for (iterator i = buf + at; n--; )
318			*i++ = t;
319	root	1.3
320	root	1.10	return buf + at;
321	root	1.3	}
322
323	sf-exg	1.19	iterator erase (iterator first, iterator last)
324	root	1.3	{
325	root	1.20	size_type n = last - first;
326			size_type c = end () - last;
327	root	1.8
328	root	1.13	if (is_simple_enough ())
329	root	1.20	memmove (first, last, sizeof (T) * c);
330	root	1.13	else
331	root	1.20	copy<iterator> (first, last, c, cop_set);
332	root	1.13
333	root	1.9	sze -= n;
334			destruct (buf + sze, n);
335	sf-exg	1.19
336			return first;
337	root	1.3	}
338
339	sf-exg	1.19	iterator erase (iterator pos)
340	root	1.3	{
341			if (pos != end ())
342	root	1.8	erase (pos, pos + 1);
343	sf-exg	1.19
344			return pos;
345	root	1.3	}
346	sf-exg	1.1	};
347
348			template<class T>
349	root	1.3	bool operator ==(const simplevec<T> &v1, const simplevec<T> &v2)
350	sf-exg	1.1	{
351	root	1.3	if (v1.size () != v2.size ()) return false;
352
353			return !v1.size () \|\| !memcmp (&v1[0], &v2[0], v1.size () * sizeof (T));
354	sf-exg	1.1	}
355
356			template<class T>
357	root	1.3	bool operator <(const simplevec<T> &v1, const simplevec<T> &v2)
358	sf-exg	1.1	{
359	root	1.3	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	sf-exg	1.1	}
366	root	1.3	return v1.size () < v2.size ();
367	sf-exg	1.1	}
368
369			template<typename T>
370			struct vector : simplevec<T>
371			{
372			};
373	sf-exg	1.2
374			#endif
375	root	1.3