Perl 诊断消息 类别含义 (W)警告(可选) (D)反对(可选) (S)严重警告(必需) (F)致命错误(可捕获) (P)你应该从未见过的内部错误(恐慌性的)(可捕获) (X)非常致命的错误(不可捕获) (A)外来错误消息(不是Perl生成的)
"system()" runs a command and returns exit status information (as a 16 bit value: the low 7 bits are the signal the process died from, if any, and the high 8 bits are the actual exit value). Backticks (``) run a command perl v5.12.5 Last change: 2012-11-03 12 Perl ...
Check you control flow and number of arguments. Bit vector size > 32 non-portable (W portable) Using bit vector sizes larger than 32 is non-portable. Bizarre copy of %s in %s (P) Perl detected an attempt to copy an internal value that is not copyable. perl v5.12.5 Last change: ...
. If I don’t check the value of $! right away, I might associate it with the wrong statement. That’s not the whole story, though. The %! hash has some magic to go along with $!. The keys to %! are the symbolic constants, such as ENOENT, from errno.h. This is a magic ...
[LC_ALL_INDEX_]); if (! sl_result[LC_ALL_INDEX_]) { setlocale_failure = TRUE; + + if (lc_all && strNE(lc_all, "")) { + /* when the env var LC_ALL is set then we can skip the setlocale + * for each individual category since that will just reuse that + * value. ...
X.value (例如. 文件测试) sub is-true() { True }; sub is-false() { False }; say '~~ non-syntactic True' if 0 ~~ is-true(); say '~~ non-syntactic True' if 'a' ~~ is-true(); 'a' ~~ .so; # True 0 ~~ .so; # False 0 ~~ .not; # True # 列表可比较 my ...
The seemingly equivalent construct in Perl, $$aref[$i] first does the deref of $aref, making it take $aref as a reference to an array, and then dereference that, and finally tell you the i'th value of the array pointed to by $AoA. If you wanted the C notion, you'd have to wri...
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* Not defining the short forms is a good thing for cleaner embedding. * BEWARE that a bunch of macros don't have long names, so either must be * added or don't use them if you define this symbol */ #if !defined(MULTIPLICITY) /* undefined symbols, point them back at the usual...
To determine at runtime if this capability has been compiled in your perl, you can check the value of $Config{usesitecustomize}. -Fpattern specifies the pattern to split on if -a is also in effect. The pattern may be surrounded by "//", "", or '', otherwise it will be put in ...