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Clarify requirements of <=>

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A return value of <=> is automatically converted to -1, 0, or 1, so
other values can be returned.  [Misc #15630]
This commit is contained in:
Shugo Maeda 2019-04-22 17:15:49 +09:00
parent 6013e41a7b
commit f005ccc771
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GPG key ID: 568AD8CEAD744A13
1 changed files with 7 additions and 6 deletions
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13
compar.c
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@ -95,7 +95,7 @@ cmpint(VALUE x, VALUE y)
* obj > other -> true or false
*
* Compares two objects based on the receiver's <code><=></code>
* method, returning true if it returns 1.
* method, returning true if it returns a value greater than 0.
*/
static VALUE
@ -110,7 +110,7 @@ cmp_gt(VALUE x, VALUE y)
* obj >= other -> true or false
*
* Compares two objects based on the receiver's <code><=></code>
* method, returning true if it returns 0 or 1.
* method, returning true if it returns a value greater than or equal to 0.
*/
static VALUE
@ -125,7 +125,7 @@ cmp_ge(VALUE x, VALUE y)
* obj < other -> true or false
*
* Compares two objects based on the receiver's <code><=></code>
* method, returning true if it returns -1.
* method, returning true if it returns a value less than 0.
*/
static VALUE
@ -140,7 +140,7 @@ cmp_lt(VALUE x, VALUE y)
* obj <= other -> true or false
*
* Compares two objects based on the receiver's <code><=></code>
* method, returning true if it returns -1 or 0.
* method, returning true if it returns a value less than or equal to 0.
*/
static VALUE
@ -209,8 +209,9 @@ cmp_clamp(VALUE x, VALUE min, VALUE max)
/*
* The Comparable mixin is used by classes whose objects may be
* ordered. The class must define the <code><=></code> operator,
* which compares the receiver against another object, returning -1,
* 0, or +1 depending on whether the receiver is less than, equal to,
* which compares the receiver against another object, returning
* a value less than 0, 0, or a value greater than 0, depending on
* whether the receiver is less than, equal to,
* or greater than the other object. If the other object is not
* comparable then the <code><=></code> operator should return +nil+.
* Comparable uses <code><=></code> to implement the conventional