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Why this simple binaryHeap program does not compile?
Sep 22, 2011
Cheng Wei
Sep 22, 2011
Ellery Newcomer
Sep 22, 2011
David Nadlinger
September 22, 2011
Gravatar of Cheng WeiPosted by Cheng WeiReply
Cheng Wei
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import std.container;

class T {
    int i;
}

void main() {
    auto array = Array!(T);
    auto heap  = BinaryHeap!(Array!(T), "a.i < b.i")(array);
}

After compiling:
dmd2/linux/bin32/../../src/phobos/std/container.d(1612): Error:
template std.conv.emplace(T) if (!is(T == class)) does not match any
function template declaration
dmd2/linux/bin32/../../src/phobos/std/container.d(1612): Error:
template std.conv.emplace(T) if (!is(T == class)) cannot deduce
template function from argument types !()(T*,T)


Is this a bug or I use the binary heap wrongly? Thanks a lot!
September 22, 2011
Gravatar of Ellery NewcomerPosted by Ellery Newcomer
in reply to Cheng Wei		Reply
Ellery Newcomer
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Posted in reply to Cheng Wei


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On 09/22/2011 06:10 AM, Cheng Wei wrote:
> 
> Is this a bug or I use the binary heap wrongly? Thanks a lot!

Looks like a bug in Array. emplace doesn't accept a pointer to a chunk for class types.

Report that puppy!
September 22, 2011
Gravatar of David NadlingerPosted by David Nadlinger
in reply to Ellery Newcomer		Reply
David Nadlinger
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Posted in reply to Ellery Newcomer


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On 9/22/11 7:20 PM, Ellery Newcomer wrote:
> Looks like a bug in Array. emplace doesn't accept a pointer to a chunk
> for class types.
>
> Report that puppy!

See https://github.com/D-Programming-Language/phobos/commit/65a0c2158b1d2ea8e9d3094746739da636266089.

David