• d-bugmail puremagic.com (47/47) May 26 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10175

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=10175

           Summary: std.conv.to for a range
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This is borderline between an enhancement and a bug report.


import std.array: array;
import std.range: iota;
import std.conv: to;
void main() {
    auto items = iota(10);
    auto r1 = items.array.to!(string[]);
    auto r2 = items.to!(string[]);
}



DMD 2.063beta7 gives:

...\dmd2\src\phobos\std\conv.d(276): Error: template std.conv.toImpl does not
match any function template declaration. Candidates are:
...\dmd2\src\phobos\std\conv.d(332):        std.conv.toImpl(T, S)(S value) if
(isImplicitlyConvertible!(S, T) && !isEnumStrToStr!(S, T) && !isNullToStr!(S,
T))
...\dmd2\src\phobos\std\conv.d(445):        std.conv.toImpl(T, S)(ref S s) if
(isRawStaticArray!(S))
...\dmd2\src\phobos\std\conv.d(461):        std.conv.toImpl(T, S)(S value) if
(is(typeof(S.init.opCast!(T)()) : T) && !isExactSomeString!(T))
...\dmd2\src\phobos\std\conv.d(492):        std.conv.toImpl(T, S)(S value) if
(!isImplicitlyConvertible!(S, T) && is(T == struct) && is(typeof(T(value))))
...\dmd2\src\phobos\std\conv.d(542):        std.conv.toImpl(T, S)(S value) if
(!isImplicitlyConvertible!(S, T) && is(T == class) && is(typeof(new T(value))))
...\dmd2\src\phobos\std\conv.d(276):        ... (16 more, -v to show) ...
...\dmd2\src\phobos\std\conv.d(332): Error: template std.conv.toImpl cannot
deduce template function from argument types !(string[])(Result)
...\dmd2\src\phobos\std\conv.d(276): Error: template instance toImpl!(string[])
errors instantiating template
test.d(7): Error: template instance std.conv.to!(string[]).to!(Result) error
instantiating

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