deimos.python.longintrepr source code

1 /**
2   Mirror _longintrepr.h
3   */
4 module deimos.python.longintrepr;
5 
6 import deimos.python.pyport;
7 import deimos.python.object;
8 import deimos.python.unicodeobject;
9 
10 extern(C):
11 // Python-header-file: Include/longintrepr.h:
12 
13 /** Long integer representation.
14    The absolute value of a number is equal to
15    	SUM(for i=0 through abs(ob_size)-1) ob_digit[i] * 2**(SHIFT*i)
16    Negative numbers are represented with ob_size < 0;
17    zero is represented by ob_size == 0.
18    In a normalized number, ob_digit[abs(ob_size)-1] (the most significant
19    digit) is never zero.  Also, in all cases, for all valid i,
20    	0 <= ob_digit[i] <= MASK.
21    The allocation function takes care of allocating extra memory
22    so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available.
23 
24    CAUTION:  Generic code manipulating subtypes of PyVarObject has to
25    aware that longs abuse  ob_size's sign bit.
26 */
27 struct PyLongObject {
28 	mixin PyObject_VAR_HEAD;
29 	ushort[1] ob_digit;
30 }
31 
32 /// _
33 PyLongObject* _PyLong_New(int);
34 
35 /** Return a copy of src. */
36 PyObject* _PyLong_Copy(PyLongObject* src);