[Issue 6154] New: std.math.abs on std.complex numbers too

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6154

           Summary: std.math.abs on std.complex numbers too
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-06-14 05:03:13 PDT ---
I'd like std.math.abs to perform what std.complex.Complex!T.abs does. So I will
be able to use it functionally (currently std.math.abs is able to work on the
built-in complex numbers too). This means I'd like this code to work:

import std.stdio, std.math, std.algorithm, std.complex;
void main() {
    alias Complex!double C;
    C[] array2 = [C(1,2), C(2,4)];
    auto m2 = map!abs(array2);
    writeln(m2);
}



In DMD 2.053 similar code with built-in complex numbers works:

import std.stdio, std.math, std.algorithm;
void main() {
    cdouble[] array1 = [1+2i, 2+4i];
    auto m1 = map!abs(array1);
    writeln(m1);
}


In DMD 2.053 if you want to do the same with complex numbers you need to write:

import std.stdio, std.math, std.algorithm, std.complex;
void main() {
    alias Complex!double C;
    C[] array2 = [C(1,2), C(2,4)];
    auto m2 = map!((c){ return c.abs(); })(array2);
    writeln(m2);
}

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