http://d.puremagic.com/issues/show_bug.cgi?id=9753

           Summary: std.string.translate precondition asserts
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-03-18 15:11:02 PDT ---
std.string.translate precondition contains code like this:


C[] translate(C = immutable char)(in char[] str, in char[] transTable, in
char[] toRemove = null) @trusted nothrow
    if(is(Unqual!C == char))
in
{
    assert(transTable.length == 256);
    foreach(char c; str)
        assert(c <= 256);
    foreach(char c; transTable)
        assert(c <= 256);
    foreach(char c; toRemove)
        assert(c <= 256);
}



I think those asserts should be:

assert(c < 256);

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich@gmail.com


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-03-18 15:13:58 PDT ---
Why are those asserts in there anyway? A char can't be larger than 255..?

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--- Comment #2 from bearophile_hugs@eml.cc 2013-03-18 15:36:03 PDT ---
(In reply to comment #1)
> Why are those asserts in there anyway? A char can't be larger than 255..?

Ah, right. My brain was switched too much off.

This looks better:

    foreach (dchar c; str)
        assert(c < 256);


But this is a full-range translate(), so it should work in the whole range of [0, 256[, so I this precondition:

in
{
    assert(transTable.length == 256);
    foreach(char c; str)
        assert(c <= 256);
    foreach(char c; transTable)
        assert(c <= 256);
    foreach(char c; toRemove)
        assert(c <= 256);
}


Should be:

in
{
    assert(transTable.length == 256);
}

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull


--- Comment #3 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-03-18 15:46:49 PDT ---
https://github.com/D-Programming-Language/phobos/pull/1211

Btw, for these trivial things you might want to try making pull requests. We can always use an extra hand with fixing things.

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--- Comment #4 from github-bugzilla@puremagic.com 2013-03-18 17:51:13 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/phobos

https://github.com/D-Programming-Language/phobos/commit/c89bc4b0e3e09c550563e7a753647562ebd2f034 Fixes Issue 9753 - Remove unnecessary asserts.

https://github.com/D-Programming-Language/phobos/commit/ff6ec13d8f1aa121ad6cde4dcf617f98208e83df Merge pull request #1211 from AndrejMitrovic/Fix9753

Issue 9753 - Remove unnecessary asserts.

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


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