perl-5.26.1
evalbytes EXPR
evalbytes

This function is similar to a string eval, except it always parses its argument (or $_ if EXPR is omitted) as a string of independent bytes.

この関数は 文字列 eval に似ていますが、引数(EXPR が 省略された場合は$_) を常にバイト単位のの文字列として 扱います。

If called when use utf8 is in effect, the string will be assumed to be encoded in UTF-8, and evalbytes will make a temporary copy to work from, downgraded to non-UTF-8. If this is not possible (because one or more characters in it require UTF-8), the evalbytes will fail with the error stored in $@.

If called when use utf8 is in effect, the string will be assumed to be encoded in UTF-8, and evalbytes will make a temporary copy to work from, downgraded to non-UTF-8. If this is not possible (because one or more characters in it require UTF-8), the evalbytes will fail with the error stored in $@. (TBT)

Bytes that correspond to ASCII-range code points will have their normal meanings for operators in the string. The treatment of the other bytes depends on if the 'unicode_strings" feature is in effect.

Bytes that correspond to ASCII-range code points will have their normal meanings for operators in the string. The treatment of the other bytes depends on if the 'unicode_strings" feature is in effect. (TBT)

Of course, variables that are UTF-8 and are referred to in the string retain that:

Of course, variables that are UTF-8 and are referred to in the string retain that: (TBT)

 my $a = "\x{100}";
 evalbytes 'print ord $a, "\n"';

prints

prints (TBT)

 256

and $@ is empty.

and $@ is empty. (TBT)

Source filters activated within the evaluated code apply to the code itself.

eval されたコード内で有効になったソースフィルタはコード自体に適用されます。

evalbytes is available starting in Perl v5.16. To access it, you must say CORE::evalbytes, but you can omit the CORE:: if the "evalbytes" feature is enabled. This is enabled automatically with a use v5.16 (or higher) declaration in the current scope.

evalbytes は Perl v5.16 から利用可能です。 これにアクセスするには CORE::evalbytes とする必要がありますが、 "evalbytes" 機能 が 有効なら CORE:: を省略できます。 これは現在のスコープで use v5.16 (またはそれ以上) 宣言があると 自動的に有効になります。