#else // !wxUSE_STL
#include "wx/utils.h"
+#include "wx/scopeguard.h"
+#include "wx/meta/movable.h"
+#include "wx/meta/if.h"
#include "wx/beforestd.h"
#include <new> // for placement new
#include "wx/afterstd.h"
+namespace wxPrivate
+{
+
+// These templates encapsulate memory operations for use by wxVector; there are
+// two implementations, both in generic way for any C++ types and as an
+// optimized version for "movable" types that uses realloc() and memmove().
+
+// version for movable types:
+template<typename T>
+struct wxVectorMemOpsMovable
+{
+ static void Free(T* array)
+ { free(array); }
+
+ static T* Realloc(T* old, size_t newCapacity, size_t WXUNUSED(occupiedSize))
+ { return (T*)realloc(old, newCapacity * sizeof(T)); }
+
+ static void MemmoveBackward(T* dest, T* source, size_t count)
+ { memmove(dest, source, count * sizeof(T)); }
+
+ static void MemmoveForward(T* dest, T* source, size_t count)
+ { memmove(dest, source, count * sizeof(T)); }
+};
+
+// generic version for non-movable types:
+template<typename T>
+struct wxVectorMemOpsGeneric
+{
+ static void Free(T* array)
+ { ::operator delete(array); }
+
+ static T* Realloc(T* old, size_t newCapacity, size_t occupiedSize)
+ {
+ T *mem = (T*)::operator new(newCapacity * sizeof(T));
+ for ( size_t i = 0; i < occupiedSize; i++ )
+ {
+ ::new(mem + i) T(old[i]);
+ old[i].~T();
+ }
+ ::operator delete(old);
+ return mem;
+ }
+
+ static void MemmoveBackward(T* dest, T* source, size_t count)
+ {
+ wxASSERT( dest < source );
+ T* destptr = dest;
+ T* sourceptr = source;
+ for ( size_t i = count; i > 0; --i, ++destptr, ++sourceptr )
+ {
+ ::new(destptr) T(*sourceptr);
+ sourceptr->~T();
+ }
+ }
+
+ static void MemmoveForward(T* dest, T* source, size_t count)
+ {
+ wxASSERT( dest > source );
+ T* destptr = dest + count - 1;
+ T* sourceptr = source + count - 1;
+ for ( size_t i = count; i > 0; --i, --destptr, --sourceptr )
+ {
+ ::new(destptr) T(*sourceptr);
+ sourceptr->~T();
+ }
+ }
+};
+
+
+} // namespace wxPrivate
+
template<typename T>
class wxVector
{
+private:
+ // This cryptic expression means "typedef Ops to wxVectorMemOpsMovable if
+ // type T is movable type, otherwise to wxVectorMemOpsGeneric".
+ //
+ // Note that we use typedef instead of privately deriving from this (which
+ // would allowed us to omit "Ops::" prefixes below) to keep VC6 happy,
+ // it can't compile code that derives from wxIf<...>::value.
+ typedef typename wxIf< wxIsMovable<T>::value,
+ wxPrivate::wxVectorMemOpsMovable<T>,
+ wxPrivate::wxVectorMemOpsGeneric<T> >::value
+ Ops;
+
public:
typedef size_t size_type;
+ typedef size_t difference_type;
typedef T value_type;
+ typedef value_type* pointer;
typedef value_type* iterator;
typedef const value_type* const_iterator;
typedef value_type& reference;
+ class reverse_iterator
+ {
+ public:
+ reverse_iterator() : m_ptr(NULL) { }
+ wxEXPLICIT reverse_iterator(iterator it) : m_ptr(it) { }
+ reverse_iterator(const reverse_iterator& it) : m_ptr(it.m_ptr) { }
+
+ reference operator*() const { return *m_ptr; }
+ pointer operator->() const { return m_ptr; }
+
+ iterator base() const { return m_ptr; }
+
+ reverse_iterator& operator++()
+ { --m_ptr; return *this; }
+ reverse_iterator operator++(int)
+ { reverse_iterator tmp = *this; --m_ptr; return tmp; }
+ reverse_iterator& operator--()
+ { ++m_ptr; return *this; }
+ reverse_iterator operator--(int)
+ { reverse_iterator tmp = *this; ++m_ptr; return tmp; }
+
+ reverse_iterator operator+(difference_type n) const
+ { return reverse_iterator(m_ptr - n); }
+ reverse_iterator& operator+=(difference_type n)
+ { m_ptr -= n; return *this; }
+ reverse_iterator operator-(difference_type n) const
+ { return reverse_iterator(m_ptr + n); }
+ reverse_iterator& operator-=(difference_type n)
+ { m_ptr += n; return *this; }
+
+ reference operator[](difference_type n) const
+ { return *(*this + n); }
+
+ bool operator ==(const reverse_iterator& it) const
+ { return m_ptr == it.m_ptr; }
+ bool operator !=(const reverse_iterator& it) const
+ { return m_ptr != it.m_ptr; }
+
+ private:
+ value_type *m_ptr;
+ };
+
wxVector() : m_size(0), m_capacity(0), m_values(NULL) {}
- wxVector(const wxVector& c)
+ wxVector(const wxVector& c) : m_size(0), m_capacity(0), m_values(NULL)
{
Copy(c);
}
m_values[i].~T();
}
- free(m_values);
+ Ops::Free(m_values);
m_values = NULL;
- m_size = m_capacity = 0;
+ m_size =
+ m_capacity = 0;
}
void reserve(size_type n)
if ( m_capacity + increment > n )
n = m_capacity + increment;
- m_values = (value_type*)realloc(m_values, n * sizeof(value_type));
-
+ m_values = Ops::Realloc(m_values, n * sizeof(value_type), m_size);
m_capacity = n;
}
wxVector& operator=(const wxVector& vb)
{
- Copy(vb);
+ if (this != &vb)
+ {
+ clear();
+ Copy(vb);
+ }
return *this;
}
// 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);
+ ::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
const_iterator end() const { return m_values + size(); }
iterator end() { return m_values + size(); }
+ reverse_iterator rbegin() { return reverse_iterator(end() - 1); }
+ reverse_iterator rend() { return reverse_iterator(begin() - 1); }
+
iterator insert(iterator it, const value_type& v = value_type())
{
// NB: this must be done before reserve(), because reserve()
reserve(size() + 1);
+ // the place where the new element is going to be inserted
+ value_type * const place = m_values + idx;
+
// 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));
- }
+ Ops::MemmoveForward(place + 1, place, after);
-#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
+ // if the ctor called below throws an exception, we need to move all
+ // the elements back to their original positions in m_values
+ wxScopeGuard moveBack = wxMakeGuard(
+ Ops::MemmoveBackward, place, place + 1, after);
+ if ( !after )
+ moveBack.Dismiss();
+
+ // use placement new to initialize new object in preallocated place in
+ // m_values and store 'v' in it:
+ ::new(place) value_type(v);
- // 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
+ // now that we did successfully add the new element, increment the size
+ // and disable moving the items back
+ moveBack.Dismiss();
m_size++;
return begin() + idx;
// erase elements by calling their destructors:
for ( iterator i = first; i < last; ++i )
- i->~value_type();
+ i->~T();
// 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));
+ Ops::MemmoveBackward(m_values + idx, m_values + idx + count, after);
}
m_size -= count;
void Copy(const wxVector& vb)
{
- clear();
reserve(vb.size());
for ( const_iterator i = vb.begin(); i != vb.end(); ++i )
projects / wxWidgets.git / blobdiff