On 11/02/2014 04:58 PM, bioinfornatics wrote:

> Dear,
> Some problem to build this code: http://fpaste.org/147327/75948141/
>
>
> $ ldc2 fasta_test.d
> /usr/include/d/std/range.d(3605): Error: template std.array.save
> cannot deduce function from argument types !()(ByChunk),
> candidates are:

I think that is due to the too permissive template constraint of takeOne in phobos/std/range.d. Even though it say "isInputRange!R", it clearly needs "isForwardRange!R" because it calls .save() on that range:

    @property auto save() { return Result(_source.save, empty); }

So, the following is wrong:

  auto takeOne(R)(R source) if (isInputRange!R)

It should be:

  auto takeOne(R)(R source) if (isForwardRange!R)

If you modify range.d locally to require ForwardRange, you will see that your following call will get an error message because byChunk is not a ForwardRange:

        // Take a piece of byte from current file
        ubyte[] buffer =  takeOne(inputRange);

I think this issue is already reported as a part of the following bug:

  https://issues.dlang.org/show_bug.cgi?id=9724

Ali

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