https://issues.dlang.org/show_bug.cgi?id=19238

          Issue ID: 19238
           Summary: no-arg splitter should work on ranges of characters
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: schveiguy@yahoo.com

Currently, std.algorithm.iteration.splitter has an overload that works just with character arrays and takes no parameters. This special overload is different from the other versions of splitter in that:

1. it only works with *arrays* of characters
2. the inferred separator is any run of whitespace, as opposed to the other
splitter overloads where the separator is a fixed length.

It's currently impossible to use the other overloads of splitter to mimic this behavior with a non-array range, such as byCodeUnit.

However, there's nothing inherently special about character arrays that makes it incorrect to use on arbitrary code unit ranges.

In other words, this should compile:

auto range = "hello    world".byCodeUnit.splitter;
static assert(is(typeof(range.front()) == typeof("hello".byCodeUnit()));
assert(range.equals(["hello".byCodeUnit, "world".byCodeUnit]);

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