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Generalize the explanation of the side effect of the rb_equal() optimization

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Benoit Daloze 2020-05-06 00:24:29 +02:00
parent 48d509cefc
commit e79e5e0b40
1 changed files with 4 additions and 2 deletions
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6
object.c
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@ -154,8 +154,10 @@ case_equal(VALUE obj1, VALUE obj2) {
* identity check using using C's == (same as BasicObject#equal?). * identity check using using C's == (same as BasicObject#equal?).
* If that check fails, it calls #== dynamically. * If that check fails, it calls #== dynamically.
* This optimization actually affects semantics, * This optimization actually affects semantics,
* as Float::NAN == Float::NAN is false, * because when #== returns false for the same object obj,
* but rb_equal(Float::NAN, Float::NAN) is true! * rb_equal(obj, obj) would still return true.
* This happens for Float::NAN, where Float::NAN == Float::NAN
* is false, but rb_equal(Float::NAN, Float::NAN) is true.
*/ */
VALUE VALUE
rb_equal(VALUE obj1, VALUE obj2) rb_equal(VALUE obj1, VALUE obj2)