bool_array::_Element Class Reference

Detailed Description

Class to represent a reference to an array element.

Definition at line 70 of file bool_array.h.


Public Member Functions
	_Element (BYTE *__ptr, unsigned long __idx)
	operator bool () const
bool	operator= (bool __value)
Private Attributes
size_t	_M_bit_idx
size_t	_M_byte_idx
BYTE *	_M_byte_ptr

Constructor & Destructor Documentation

bool_array::_Element::_Element	(	BYTE *	__ptr,
		unsigned long	__idx
	)			`[inline]`

Constructs a reference to an array element.

Parameters:

	__ptr	pointer to the interal boolean data
	__idx	index of the array element to access

Definition at line 116 of file bool_array.h.

References _M_bit_idx, _M_byte_idx, and _M_byte_ptr.

00117 {
00118     _M_byte_ptr = __ptr;
00119     _M_byte_idx = (size_t)(__idx / 8);
00120     _M_bit_idx  = (size_t)(__idx % 8);
00121 }

Member Function Documentation

bool_array::_Element::operator bool ( ) const [inline]

Reads the boolean value from an array element.

Returns:: the boolean value of the accessed array element

Definition at line 143 of file bool_array.h.

References _M_bit_idx, _M_byte_idx, and _M_byte_ptr.

00144 {
00145     return *(_M_byte_ptr + _M_byte_idx) & (1 << _M_bit_idx) ? true : false;
00146 }

bool bool_array::_Element::operator= ( bool __value ) [inline]

Assigns a new boolean value to an array element.

Parameters:

__value

the new boolean value

Returns:: the assigned boolean value

Definition at line 129 of file bool_array.h.

References _M_bit_idx, _M_byte_idx, and _M_byte_ptr.

00130 {
00131     if (__value)
00132         *(_M_byte_ptr + _M_byte_idx) |= 1 << _M_bit_idx;
00133     else
00134         *(_M_byte_ptr + _M_byte_idx) &= ~(1 << _M_bit_idx);
00135     return __value;
00136 }