http://d.puremagic.com/issues/show_bug.cgi?id=8158
Summary: std.algorithm.min fails to compile with user-defined
types
Product: D
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: nob...@puremagic.com
ReportedBy: jmdavisp...@gmx.com
--- Comment #0 from Jonathan M Davis <jmdavisp...@gmx.com> 2012-05-29 02:36:43
PDT ---
This code
import std.algorithm;
import std.datetime;
import std.stdio;
void main()
{
writeln(min(Date(2012, 5, 7), Date(2011, 2, 9)));
writeln(max(Date(2012, 5, 7), Date(2011, 2, 9)));
}
should print
2011-Feb-09
2012-May-07
Instead, it fails to compile with
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/traits.d(4289): Error:
incompatible types for ((min()) == (0)): 'Date' and 'int'
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/traits.d(4289): Error: error
evaluating static if expression
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5035): Error:
template instance std.traits.mostNegative!(Date) error instantiating
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5055): Error:
template instance std.algorithm.MinType!(Date,Date) error instantiating
q.d(7): instantiated from here: min!(Date,Date,)
q.d(7): Error: template instance std.algorithm.min!(Date,Date,) error
instantiating
or, if pull request #611 (
https://github.com/D-Programming-Language/phobos/pull/611 ) is pulled in, it
fails to compile with
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5035): Error:
template instance mostNegative!(Date) mostNegative!(Date) does not match
template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T))
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5035): Error:
template instance mostNegative!(Date) mostNegative!(Date) does not match
template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T))
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5037): Error:
template instance mostNegative!(Date) mostNegative!(Date) does not match
template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T))
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5037): Error:
template instance mostNegative!(Date) mostNegative!(Date) does not match
template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T))
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5055): Error:
template instance std.algorithm.MinType!(Date,Date) error instantiating
q.d(7): instantiated from here: min!(Date,Date,)
q.d(7): Error: template instance std.algorithm.min!(Date,Date,) error
instantiating
In either case, the std.algorithm.min is failing to compile. max actually works
if you comment out the call to min, but min is broken.
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