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Problems:

  • Your code won't always compile. PPCODE cannot start with variable declarations as it can be preceded by non-declarations.

    PPCODE: int i; f();
    should be
    PREINIT: int i; PPCODE: f();
    or
    PPCODE: { int i; f(); }
  • Your snippets don't handle magical variables (e.g. $1, %ENV) except sometimes by chance. e.g.

    say lengths1(substr("abc", 0, 1)); # 0
  • lengths1 uses SvLEN when it should be usingSvCUR. e.g.

    say lengths1("abc"); # 16
  • Your snippets suffer from The Unicode bug. e.g. After fixing the above problems,

    $_="\x{A0}"; say lengths1($_), "=", length($_); # 1=1 $_="\x{A0}\x{2660}"; chop; say lengths1($_), "=", length($_); # 2=1
  • lengths1 uses type-based polymorphism —something which should be avoided in Perl— and does it "poorly". e.g. After fixing the above problems,

    say lengths1(456), "=", length(456); # 0=3

In reply to Re: Yet Another XS Tutorial by ikegami
in thread Yet Another XS Tutorial by cdybedahl

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