So first of all, I'd say you're not going to want to use val for anything
remotely performance sensitive. There's a lot of overhead marshalling
values back and forth.
Directly to your point, val can represent any javascript value, including
those for which comparator operators don't make sense. For example 3 <
{'foo':'bar'}. You'll want to cast your val type to the underlying key of
your priority queue.
On Tuesday, February 27, 2018 at 11:01:26 PM UTC-8, michael dalton wrote:
>
> I was pointed here by an old documentation writer for emscripten so I hope
> this is the right forum!
>
>
> While creating a priority queue with emscripten::val's. I'm running into
> trouble when I insert elements.
>
> Error
> c:\Emscripten\emscripten\1.37.9\system\include\libcxx\__functional_base:61:21:
>
> error: invalid operands to binary expression ('const emscripten::val' and
> 'const emscripten::val') {return __x < __y;}
>
> The priority queue uses a binary operator, which according to the val.h
> has not yet been implemented yet. (line 268
> https://chromium.googlesource.com/external/github.com/kripken/emscripten/+/1.35.20/system/include/emscripten/val.h
> )
>
> Below is the full sample used to create the error.
>
> `
> #include
> #include
> #include <emscripten/bind.h>
>
> using namespace emscripten;
>
> void (std::priority_queue::*push)(const val&) = &std::priority_queue::push;
>
> EMSCRIPTEN_BINDINGS(my_stack) {
> class_<std::priority_queue>("MyStack")
> .constructor<>()
> .function("push", push)
> .function("top", &std::priority_queue::top)
> .function("size", &std::priority_queue::size)
> .function("empty", &std::priority_queue::empty);
> }
> `
>
> I have tried creating a comparator function for the container but have had
> no success. Is there a way to sort the emscripten vals with my own
> comparators? Do I have to define my own binary operator on the class to do
> any form of sorted container? I've think I've tried this in one form or
> another - is it my c++ or am I missing something?
>
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