http://d.puremagic.com/issues/show_bug.cgi?id=5121

           Summary: Make std.algorithm.swap weakly pure
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: patch
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2010-10-26 12:57:01 PDT ---
This is a test program that fails with dmd 2.050alpha:


import std.algorithm: swap;
pure int foo(int x, int y) {
    swap(x, y);
    return y;
}
void main() {
    assert(foo(10, 20) == 10);
}


But swap may be modified to become weakly pure, just changing this line 1063:

void swap(T)(ref T a, ref T b) if (!is(typeof(T.init.proxySwap(T.init))))


Into:

pure void swap(T)(ref T a, ref T b) if (!is(typeof(T.init.proxySwap(T.init))))


(Probably several other functions in Phobos may now be tagged was (weakly)
pure.)

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--- Comment #1 from bearophile_hugs@eml.cc 2010-11-19 10:05:01 PST ---
See:
http://www.dsource.org/projects/phobos/changeset/2180

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yebblies@gmail.com
         Resolution|                            |FIXED


--- Comment #2 from yebblies <yebblies@gmail.com> 2011-07-15 14:26:57 EST ---
This code now compiles with the new purity inference in dmd 2.054 (or was it
the phobos changes?)
Either way, fixed.

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