diff options
Diffstat (limited to 'Changes')
| -rw-r--r-- | Changes | 83 |
1 files changed, 53 insertions, 30 deletions
@@ -1,36 +1,9 @@ -Incompatibilities ------------------ - s'$lhs'$rhs' now does no interpolation on either side. It used to - interplolate $lhs but not $rhs. - - The second and third arguments of splice are now evaluated in scalar - context (like the book says) rather than list context. - - Saying "shift @foo + 20" is now a semantic error because of precedence. - - "open FOO || die" is now incorrect. You need parens around the filehandle. - - The elements of argument lists for formats are now evaluated in list - context. This means you can interpolate list values now. - - You can't do a goto into a block that is optimized away. Darn. - - It is no longer syntactically legal to use whitespace as the name - of a variable. - - Some error messages will be different. - - The caller function now a false value in a scalar context if there is - no caller. This lets library files determine if they're being required. - - m//g now attaches its state to the searched string rather than the - regular expression. - New things ---------- The -w switch is much more informative. - References. See t/op/ref.t for examples. + References. See t/op/ref.t for examples. All entities in Perl 5 are + reference counted so that it knows when each item should be destroyed. Objects. See t/op/ref.t for examples. @@ -42,7 +15,9 @@ New things meaning the parens are optional. Even subroutines may be called as list operators if they've already been declared. - More embeddible. See main.c and embed_h.SH. + More embeddible. See main.c and embed_h.SH. Multiple interpreters + in the same process are supported (though not with interleaved + execution yet). The interpreter is now flattened out. Compare Perl 4's eval.c with the perl 5's pp.c. Compare Perl 4's 900 line interpreter loop in cmd.c @@ -73,3 +48,51 @@ New things variables. Saying "package;" requires explicit package name on global symbols. + + The preferred package delimiter is now :: rather than '. + + tie/untie are now preferred to dbmopen/dbmclose. Multiple DBM + implementations are allowed in the same executable, so you can + write scripts to interchange data among different formats. + + New "and" and "or" operators work just like && and || but with + a precedence lower than comma, so they work better with list operators. + + New functions include: abs(), chr(), uc(), ucfirst(), lc(), lcfirst() + +Incompatibilities +----------------- + @ now always interpolates an array in double-quotish strings. Some programs + may now need to use backslash to protect any @ that shouldn't interpolate. + + s'$lhs'$rhs' now does no interpolation on either side. It used to + interplolate $lhs but not $rhs. + + The second and third arguments of splice are now evaluated in scalar + context (like the book says) rather than list context. + + Saying "shift @foo + 20" is now a semantic error because of precedence. + + "open FOO || die" is now incorrect. You need parens around the filehandle. + + The elements of argument lists for formats are now evaluated in list + context. This means you can interpolate list values now. + + You can't do a goto into a block that is optimized away. Darn. + + It is no longer syntactically legal to use whitespace as the name + of a variable. + + Some error messages will be different. + + The caller function now returns a false value in a scalar context if there + is no caller. This lets library files determine if they're being required. + + m//g now attaches its state to the searched string rather than the + regular expression. + + "reverse" is no longer allowed as the name of a sort subroutine. + + taintperl is no longer a separate executable. There is now a -T + switch to turn on tainting when it isn't turned on automatically. + |