[Issue 11188] New: std.math.abs fails for shared, const or immutable BigInt types

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11188

           Summary: std.math.abs fails for shared, const or immutable
                    BigInt types
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: joseph.wakeling at webdrake.net


--- Comment #0 from Joseph Rushton Wakeling <joseph.wakeling at webdrake.net> 2013-10-07 05:27:33 PDT ---
Created an attachment (id=1259)
Example code illustrating the problem with std.math.abs and shared, const or
immutable BigInts.

std.math.abs seems to work effectively with all mutable numeric types,
including std.bigint.BigInt.

However, if BigInts are qualified as shared, const or immutable, std.math.abs
will fail to compile.

Sample code attached illustrating the problem.  rdmd bigabs.d gives the errors:

------------------------------------------------------------------------------
bigabs.d(6): Error: template std.math.abs does not match any function template
declaration. Candidates are:
/opt/dmd/include/d2/std/math.d(303):        std.math.abs(Num)(Num x) if
(is(typeof(Num.init >= 0)) && is(typeof(-Num.init)) && !(is(Num* :
const(ifloat*)) || is(Num* : const(idouble*)) || is(Num* : const(ireal*))))
/opt/dmd/include/d2/std/math.d(314):        std.math.abs(Num)(Num z) if
(is(Num* : const(cfloat*)) || is(Num* : const(cdouble*)) || is(Num* :
const(creal*)))
/opt/dmd/include/d2/std/math.d(322):        std.math.abs(Num)(Num y) if
(is(Num* : const(ifloat*)) || is(Num* : const(idouble*)) || is(Num* :
const(ireal*)))
bigabs.d(6): Error: template std.math.abs(Num)(Num x) if (is(typeof(Num.init >=
0)) && is(typeof(-Num.init)) && !(is(Num* : const(ifloat*)) || is(Num* :
const(idouble*)) || is(Num* : const(ireal*)))) cannot deduce template function
from argument types !()(shared(BigInt))
bigabs.d(14): Error: template instance bigabs.foo!(shared(BigInt)) error
instantiating
bigabs.d(6): Error: template std.math.abs does not match any function template
declaration. Candidates are:
/opt/dmd/include/d2/std/math.d(303):        std.math.abs(Num)(Num x) if
(is(typeof(Num.init >= 0)) && is(typeof(-Num.init)) && !(is(Num* :
const(ifloat*)) || is(Num* : const(idouble*)) || is(Num* : const(ireal*))))
/opt/dmd/include/d2/std/math.d(314):        std.math.abs(Num)(Num z) if
(is(Num* : const(cfloat*)) || is(Num* : const(cdouble*)) || is(Num* :
const(creal*)))
/opt/dmd/include/d2/std/math.d(322):        std.math.abs(Num)(Num y) if
(is(Num* : const(ifloat*)) || is(Num* : const(idouble*)) || is(Num* :
const(ireal*)))
bigabs.d(6): Error: template std.math.abs(Num)(Num x) if (is(typeof(Num.init >=
0)) && is(typeof(-Num.init)) && !(is(Num* : const(ifloat*)) || is(Num* :
const(idouble*)) || is(Num* : const(ireal*)))) cannot deduce template function
from argument types !()(const(BigInt))
bigabs.d(15): Error: template instance bigabs.foo!(const(BigInt)) error
instantiating
bigabs.d(6): Error: template std.math.abs does not match any function template
declaration. Candidates are:
/opt/dmd/include/d2/std/math.d(303):        std.math.abs(Num)(Num x) if
(is(typeof(Num.init >= 0)) && is(typeof(-Num.init)) && !(is(Num* :
const(ifloat*)) || is(Num* : const(idouble*)) || is(Num* : const(ireal*))))
/opt/dmd/include/d2/std/math.d(314):        std.math.abs(Num)(Num z) if
(is(Num* : const(cfloat*)) || is(Num* : const(cdouble*)) || is(Num* :
const(creal*)))
/opt/dmd/include/d2/std/math.d(322):        std.math.abs(Num)(Num y) if
(is(Num* : const(ifloat*)) || is(Num* : const(idouble*)) || is(Num* :
const(ireal*)))
bigabs.d(6): Error: template std.math.abs(Num)(Num x) if (is(typeof(Num.init >=
0)) && is(typeof(-Num.init)) && !(is(Num* : const(ifloat*)) || is(Num* :
const(idouble*)) || is(Num* : const(ireal*)))) cannot deduce template function
from argument types !()(immutable(BigInt))
bigabs.d(16): Error: template instance bigabs.foo!(immutable(BigInt)) error
instantiating
Failed: 'dmd' '-v' '-o-' 'bigabs.d' '-I.'
------------------------------------------------------------------------------

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