Mercurial > cpython-lru_cache-weakref
diff Objects/floatobject.c @ 1257:1cabc2b6c970 legacy-trunk
* Changed all copyright messages to include 1993.
* Stubs for faster implementation of local variables (not yet finished)
* Added function name to code object. Print it for code and function
objects. THIS MAKES THE .PYC FILE FORMAT INCOMPATIBLE (the version
number has changed accordingly)
* Print address of self for built-in methods
* New internal functions getattro and setattro (getattr/setattr with
string object arg)
* Replaced "dictobject" with more powerful "mappingobject"
* New per-type functio tp_hash to implement arbitrary object hashing,
and hashobject() to interface to it
* Added built-in functions hash(v) and hasattr(v, 'name')
* classobject: made some functions static that accidentally weren't;
added __hash__ special instance method to implement hash()
* Added proper comparison for built-in methods and functions
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Mon, 29 Mar 1993 10:43:31 +0000 |
| parents | c4cd0d9d8281 |
| children | 2919b448e385 |
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--- a/Objects/floatobject.c Sat Mar 27 18:11:32 1993 +0000 +++ b/Objects/floatobject.c Mon Mar 29 10:43:31 1993 +0000 @@ -145,6 +145,38 @@ return (i < j) ? -1 : (i > j) ? 1 : 0; } +static long +float_hash(v) + floatobject *v; +{ + double intpart, fractpart; + int expo; + long x; + /* This is designed so that Python numbers with the same + value hash to the same value, otherwise comparisons + of mapping keys will turn out weird */ + fractpart = modf(v->ob_fval, &intpart); + if (fractpart == 0.0) { + if (intpart > 0x7fffffffL || -intpart > 0x7fffffffL) { + /* Convert to long int and use its hash... */ + object *w = dnewlongobject(v->ob_fval); + if (w == NULL) + return -1; + x = hashobject(w); + DECREF(w); + return x; + } + x = (long)intpart; + } + else { + fractpart = frexp(fractpart, &expo); + x = (long) (intpart + fractpart) ^ expo; /* Rather arbitrary */ + } + if (x == -1) + x = -2; + return x; +} + static object * float_add(v, w) floatobject *v; @@ -378,4 +410,5 @@ &float_as_number, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ + float_hash, /*tp_hash */ };