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| author | Paul "LeoNerd" Evans <leonerd@leonerd.org.uk> | 2019-10-23 19:00:38 +0100 |
|---|---|---|
| committer | Paul "LeoNerd" Evans <leonerd@leonerd.org.uk> | 2019-12-09 23:19:05 +0000 |
| commit | 813e85a03dc214f719dc8248bda36156897b0757 (patch) | |
| tree | 9e3c12a41469a967477219e0d0a670ab593618d2 /keywords.c | |
| parent | e139e9c0aa8151ab29e98bb9f3216ee7a14abe4d (diff) | |
| download | perl-813e85a03dc214f719dc8248bda36156897b0757.tar.gz | |
Add the `isa` operator
Adds a new infix operator named `isa`, with the semantics that
$x isa SomeClass
is true if and only if `$x` is a blessed object reference that is either
`SomeClass` directly, or includes the class somewhere in its @ISA
hierarchy. It is false without warning or error for non-references or
non-blessed references.
This operator respects `->isa` method overloading, and is intended to
replace boilerplate code such as
use Scalar::Util 'blessed';
blessed($x) and $x->isa("SomeClass")
Diffstat (limited to 'keywords.c')
| -rw-r--r-- | keywords.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/keywords.c b/keywords.c index 9fa30e616a..d503bc9c2d 100644 --- a/keywords.c +++ b/keywords.c @@ -203,7 +203,7 @@ Perl_keyword (pTHX_ const char *name, I32 len, bool all_keywords) goto unknown; } - case 3: /* 28 tokens of length 3 */ + case 3: /* 29 tokens of length 3 */ switch (name[0]) { case 'E': @@ -320,13 +320,27 @@ Perl_keyword (pTHX_ const char *name, I32 len, bool all_keywords) goto unknown; case 'i': - if (name[1] == 'n' && - name[2] == 't') - { /* int */ - return -KEY_int; - } + switch (name[1]) + { + case 'n': + if (name[2] == 't') + { /* int */ + return -KEY_int; + } - goto unknown; + goto unknown; + + case 's': + if (name[2] == 'a') + { /* isa */ + return (all_keywords || FEATURE_ISA_IS_ENABLED ? -KEY_isa : 0); + } + + goto unknown; + + default: + goto unknown; + } case 'l': if (name[1] == 'o' && @@ -3437,5 +3451,5 @@ unknown: } /* Generated from: - * db0472e0ad4f44bd0816cad799d63b60d1bbd7e11cef40ea15bf0d00f69669f6 regen/keywords.pl + * f77998a5bc995c1b42d3d080de227ef5f11638bcd329367431d8f193aef2d3cc regen/keywords.pl * ex: set ro: */ |