BoundsCheckedPointer.h [plain text]
#ifndef WTF_BoundsCheckedPointer_h
#define WTF_BoundsCheckedPointer_h
#include <wtf/Assertions.h>
namespace WTF {
template<typename T>
class BoundsCheckedPointer {
public:
BoundsCheckedPointer()
: m_pointer(0)
#if !ASSERT_DISABLED
, m_begin(0)
, m_end(0)
#endif
{
}
BoundsCheckedPointer(T* pointer, size_t numElements)
: m_pointer(pointer)
#if !ASSERT_DISABLED
, m_begin(pointer)
, m_end(pointer + numElements)
#endif
{
UNUSED_PARAM(numElements);
}
BoundsCheckedPointer(T* pointer, T* end)
: m_pointer(pointer)
#if !ASSERT_DISABLED
, m_begin(pointer)
, m_end(end)
#endif
{
UNUSED_PARAM(end);
}
BoundsCheckedPointer(T* pointer, T* begin, size_t numElements)
: m_pointer(pointer)
#if !ASSERT_DISABLED
, m_begin(begin)
, m_end(begin + numElements)
#endif
{
UNUSED_PARAM(begin);
UNUSED_PARAM(numElements);
}
BoundsCheckedPointer(T* pointer, T* begin, T* end)
: m_pointer(pointer)
#if !ASSERT_DISABLED
, m_begin(begin)
, m_end(end)
#endif
{
UNUSED_PARAM(begin);
UNUSED_PARAM(end);
}
BoundsCheckedPointer& operator=(T* value)
{
m_pointer = value;
return *this;
}
BoundsCheckedPointer& operator+=(ptrdiff_t amount)
{
m_pointer += amount;
return *this;
}
BoundsCheckedPointer& operator-=(ptrdiff_t amount)
{
m_pointer -= amount;
return *this;
}
BoundsCheckedPointer operator+(ptrdiff_t amount) const
{
BoundsCheckedPointer result = *this;
result.m_pointer += amount;
return result;
}
BoundsCheckedPointer operator-(ptrdiff_t amount) const
{
BoundsCheckedPointer result = *this;
result.m_pointer -= amount;
return result;
}
BoundsCheckedPointer operator++() {
m_pointer++;
return *this;
}
BoundsCheckedPointer operator--() {
m_pointer--;
return *this;
}
BoundsCheckedPointer operator++(int) {
BoundsCheckedPointer result = *this;
m_pointer++;
return result;
}
BoundsCheckedPointer operator--(int) {
BoundsCheckedPointer result = *this;
m_pointer--;
return result;
}
bool operator<(T* other) const
{
return m_pointer < other;
}
bool operator<=(T* other) const
{
return m_pointer <= other;
}
bool operator>(T* other) const
{
return m_pointer > other;
}
bool operator>=(T* other) const
{
return m_pointer >= other;
}
bool operator==(T* other) const
{
return m_pointer == other;
}
bool operator!=(T* other) const
{
return m_pointer != other;
}
bool operator<(BoundsCheckedPointer other) const
{
return m_pointer < other.m_pointer;
}
bool operator<=(BoundsCheckedPointer other) const
{
return m_pointer <= other.m_pointer;
}
bool operator>(BoundsCheckedPointer other) const
{
return m_pointer > other.m_pointer;
}
bool operator>=(BoundsCheckedPointer other) const
{
return m_pointer >= other.m_pointer;
}
bool operator==(BoundsCheckedPointer other) const
{
return m_pointer == other.m_pointer;
}
bool operator!=(BoundsCheckedPointer other) const
{
return m_pointer != other.m_pointer;
}
BoundsCheckedPointer operator!()
{
return !m_pointer;
}
T* get()
{
return m_pointer;
}
T& operator*()
{
validate();
return *m_pointer;
}
const T& operator*() const
{
validate();
return *m_pointer;
}
T& operator[](ptrdiff_t index)
{
validate(m_pointer + index);
return m_pointer[index];
}
const T& operator[](ptrdiff_t index) const
{
validate(m_pointer + index);
return m_pointer[index];
}
BoundsCheckedPointer& strcat(const T* source)
{
while (*source)
*(*this)++ = *source++;
return *this;
}
private:
void validate(T* pointer) const
{
ASSERT_UNUSED(pointer, pointer >= m_begin);
ASSERT_UNUSED(pointer, pointer + 1 <= m_end);
}
void validate() const
{
validate(m_pointer);
}
T* m_pointer;
#if !ASSERT_DISABLED
T* m_begin;
T* m_end;
#endif
};
}
using WTF::BoundsCheckedPointer;
#endif // WTF_BoundsCheckedPointer_h