#else // !wxUSE_STL
+#include "wx/utils.h"
+
+#include "wx/beforestd.h"
+#include <new> // for placement new
+#include "wx/afterstd.h"
+
template<typename T>
class wxVector
{
typedef size_t size_type;
typedef T value_type;
typedef value_type* iterator;
+ typedef const value_type* const_iterator;
typedef value_type& reference;
- wxVector() : m_allocsize(16), m_size(0), m_capacity(0), m_objects(0) {}
+ wxVector() : m_size(0), m_capacity(0), m_values(NULL) {}
wxVector(const wxVector& c)
{
- wxCHECK2(Copy(c), return);
+ Copy(c);
}
~wxVector()
void clear()
{
- for (size_type i = 0; i < size(); i++)
- delete m_objects[i];
- free(m_objects);
- m_objects = 0;
+ // call destructors of stored objects:
+ for ( size_type i = 0; i < m_size; i++ )
+ {
+ m_values[i].~value_type();
+ }
+
+ free(m_values);
+ m_values = NULL;
m_size = m_capacity = 0;
}
void reserve(size_type n)
{
- if ( !Alloc(n) )
- {
- wxFAIL_MSG( _T("out of memory in wxVector::reserve()") );
- }
+ if ( n <= m_capacity )
+ return;
+
+ // increase the size twice, unless we're already too big or unless
+ // more is requested
+ //
+ // NB: casts to size_type are needed to suppress mingw32 warnings about
+ // mixing enums and ints in the same expression
+ const size_type increment = m_size > 0
+ ? wxMin(m_size, (size_type)ALLOC_MAX_SIZE)
+ : (size_type)ALLOC_INITIAL_SIZE;
+ if ( m_capacity + increment > n )
+ n = m_capacity + increment;
+
+ m_values = (value_type*)realloc(m_values, n * sizeof(value_type));
+
+ m_capacity = n;
}
size_type size() const
wxVector& operator=(const wxVector& vb)
{
- wxCHECK(Copy(vb), *this);
+ Copy(vb);
return *this;
}
- void push_back(const value_type& o)
+ void push_back(const value_type& v)
{
- wxCHECK2(Alloc(size() + 1), return);
- Append(new value_type(o));
+ reserve(size() + 1);
+
+ // use placement new to initialize new object in preallocated place in
+ // m_values and store 'v' in it:
+ void* const place = m_values + m_size;
+ new(place) value_type(v);
+
+ // only increase m_size if the ctor didn't throw an exception; notice
+ // that if it _did_ throw, everything is OK, because we only increased
+ // vector's capacity so far and possibly written some data to
+ // uninitialized memory at the end of m_values
+ m_size++;
}
void pop_back()
{
- RemoveAt(size() - 1);
+ erase(end() - 1);
}
const value_type& at(size_type idx) const
{
wxASSERT(idx < m_size);
- return *m_objects[idx];
+ return m_values[idx];
}
value_type& at(size_type idx)
{
wxASSERT(idx < m_size);
- return *m_objects[idx];
+ return m_values[idx];
}
const value_type& operator[](size_type idx) const { return at(idx); }
const value_type& back() const { return at(size() - 1); }
value_type& back() { return at(size() - 1); }
- iterator begin() { return m_objects[0]; }
- iterator end() { return m_objects[size()]; }
+ const_iterator begin() const { return m_values; }
+ iterator begin() { return m_values; }
+ const_iterator end() const { return m_values + size(); }
+ iterator end() { return m_values + size(); }
- iterator erase(iterator first, iterator last)
- {
- size_type idx = first - begin();
- RemoveAt(idx, last - first);
- return begin() + idx;
- }
- iterator erase(iterator it)
- {
- size_type idx = it - begin();
- RemoveAt(idx);
- return begin() + idx;
- }
-
iterator insert(iterator it, const value_type& v = value_type())
{
- wxCHECK2(Alloc(size() + 1), return 0);
- size_type idx = it - begin();
- InsertAt(new value_type(o), idx);
- return begin() + idx;
- }
+ // NB: this must be done before reserve(), because reserve()
+ // invalidates iterators!
+ const size_t idx = it - begin();
+ const size_t after = end() - it;
-private:
- bool Alloc(size_type sz)
- {
- // work in multiples of m_allocsize;
- sz = (sz / m_allocsize + 1) * m_allocsize;
- if (sz <= m_capacity)
- return true;
+ reserve(size() + 1);
- // try to realloc
- void *mem = realloc(m_objects, sizeof(value_type*) * sz);
- if (! mem)
- return false; // failed
- // success
- m_objects = (value_type **) mem;
- m_capacity = sz;
- return true;
- }
+ // unless we're inserting at the end, move following elements out of
+ // the way:
+ if ( after > 0 )
+ {
+ memmove(m_values + idx + 1,
+ m_values + idx,
+ after * sizeof(value_type));
+ }
- void Append(value_type *obj)
- {
- wxASSERT(m_size < m_capacity);
- m_objects[m_size] = obj;
+#if wxUSE_EXCEPTIONS
+ try
+ {
+#endif
+ // use placement new to initialize new object in preallocated place
+ // in m_values and store 'v' in it:
+ void* const place = m_values + idx;
+ new(place) value_type(v);
+#if wxUSE_EXCEPTIONS
+ }
+ catch ( ... )
+ {
+ // if the ctor threw an exception, we need to move all the elements
+ // back to their original positions in m_values
+ if ( after > 0 )
+ {
+ memmove(m_values + idx,
+ m_values + idx + 1,
+ after * sizeof(value_type));
+ }
+
+ throw; // rethrow the exception
+ }
+#endif // wxUSE_EXCEPTIONS
+
+ // increment m_size only if ctor didn't throw -- if it did, we'll be
+ // left with m_values larger than necessary, but number of elements will
+ // be the same
m_size++;
+
+ return begin() + idx;
}
- void InsertAt(size_type idx, value_type *obj)
+ iterator erase(iterator it)
{
- wxASSERT(idx <= m_size);
- wxASSERT(m_size < m_capacity);
- if (idx < m_size)
- memmove(
- m_objects + idx + 1,
- m_objects + idx,
- ( m_size - idx ) * sizeof(value_type*) );
-
- m_size++;
+ return erase(it, it + 1);
}
- void RemoveAt(size_type idx)
+ iterator erase(iterator first, iterator last)
{
- wxASSERT(idx < m_size);
- delete m_objects[idx];
- if (idx < m_size - 1)
- memcpy(
- m_objects + idx,
- m_objects + idx + 1,
- ( m_size - idx - 1 ) * sizeof(value_type*) );
- m_size--;
- }
-
- void RemoveAt(size_type idx, size_type count)
- {
- if (count == 0)
- return;
- wxASSERT(idx < m_size);
- size_type i;
- for (i = 0; i < count; i++)
- delete m_objects[idx+1];
- if (idx < m_size - count)
- memcpy(
- m_objects + idx,
- m_objects + idx + count,
- ( m_size - idx - count ) * sizeof(value_type*) );
+ if ( first == last )
+ return first;
+ wxASSERT( first < end() && last <= end() );
+
+ const size_type idx = first - begin();
+ const size_type count = last - first;
+ const size_type after = end() - last;
+
+ // erase elements by calling their destructors:
+ for ( iterator i = first; i < last; ++i )
+ i->~value_type();
+
+ // once that's done, move following elements over to the freed space:
+ if ( after > 0 )
+ {
+ memmove(m_values + idx,
+ m_values + idx + count,
+ after * sizeof(value_type));
+ }
+
m_size -= count;
+
+ return begin() + idx;
}
- bool Copy(const wxVector& vb)
+
+#if WXWIN_COMPATIBILITY_2_8
+ wxDEPRECATED( size_type erase(size_type n) );
+#endif // WXWIN_COMPATIBILITY_2_8
+
+private:
+ // VC6 can't compile static const int members
+ enum { ALLOC_INITIAL_SIZE = 16 };
+ enum { ALLOC_MAX_SIZE = 4096 };
+
+ void Copy(const wxVector& vb)
{
clear();
- if (! Alloc(vb.size()))
- return false;
+ reserve(vb.size());
- for (size_type i = 0; i < vb.size(); i++)
- {
- value_type *o = new value_type(vb.at(i));
- if (! o)
- return false;
- Append(o);
- }
-
- return true;
+ for ( const_iterator i = vb.begin(); i != vb.end(); ++i )
+ push_back(*i);
}
private:
- size_type m_allocsize;
size_type m_size,
m_capacity;
- value_type **m_objects;
+ value_type *m_values;
};
+#if WXWIN_COMPATIBILITY_2_8
+template<typename T>
+inline typename wxVector<T>::size_type wxVector<T>::erase(size_type n)
+{
+ erase(begin() + n);
+ return n;
+}
+#endif // WXWIN_COMPATIBILITY_2_8
+
#endif // wxUSE_STL/!wxUSE_STL
#if WXWIN_COMPATIBILITY_2_8
projects / wxWidgets.git / blobdiff