29:null 2a:["$","title",null,{"children":"Embind test | Ricky Reusser | Observable"}] 2f:T550,md`For full reference, library.cpp looks like this:

library.cpp

${md`\`\`\`cpp #include #include #include #include using namespace emscripten; EMSCRIPTEN_BINDINGS(EigenJS) { class_("MatrixXf") .smart_ptr_constructor>("shared_ptr", &std::make_shared) .constructor() .function("rows", optional_override([](const Eigen::MatrixXf& self) { return self.rows(); })) .function("cols", optional_override([](const Eigen::MatrixXf& self) { return self.cols(); })) .function("get", optional_override([](const Eigen::MatrixXf& self, int i, int j) { return self(i, j); })) .function("outerStride", optional_override([](const Eigen::MatrixXf& self) { return self.outerStride(); })) .function("innerStride", optional_override([](const Eigen::MatrixXf& self) { return self.innerStride(); })) .function("set", optional_override([](Eigen::MatrixXf& self, int i, int j, float value) { self(i, j) = value; return value; })) .function("buffer", optional_override([](Eigen::MatrixXf& self) { return val(typed_memory_view(self.size(), (float*)self.data())); })) ; } \`\`\``}

`30:[{"id":"9c8bbf8d7f99b66d9d8e55bc39ae7db5ae6bae75ebaef9fd8f2658315d838849ab79155bb041c9890017455b719bbb646ac47266729051b10579018a5621dc1c","href":"https://static.observableusercontent.com/files/9c8bbf8d7f99b66d9d8e55bc39ae7db5ae6bae75ebaef9fd8f2658315d838849ab79155bb041c9890017455b719bbb646ac47266729051b10579018a5621dc1c","name":"library@5.js","type":"application/javascript","lastModified":1575484283163.919,"size":249924}] 2d:{"id":"7ae13549e5ca778c","slug":null,"title":"Embind test","thumbnail":"a9e115477ab90cfff34008a9a73f6bfcf07d8a66ba26ca535194c02823feaea8","access_level":"unlisted","create_time":"$D2019-12-04T17:45:37.069Z","update_time":"$D2019-12-04T21:41:35.506Z","view_time":null,"first_public_time":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"f1b8352b963a77b4","login":"rreusser","name":"Ricky Reusser","avatar_url":"https://avatars-next.observableusercontent.com/49c18a2ac0092176d4ea8348a1dd538e0b460b086b89d602b8d21ffe0821d92e","tier":"starter_2024"},"version":228,"publish_version":228,"role":null,"authored":false,"authors":[{"type":"individual","id":"908c4be2279a714e","login":"rreusser","name":"Ricky Reusser","avatar_url":"https://avatars-next.observableusercontent.com/fa41989f47bb986723af5b9c22176cb503748426f56e565000ea93acd9eab86c","tier":null}],"members":[{"type":"individual","id":"908c4be2279a714e","login":"rreusser","name":"Ricky Reusser","avatar_url":"https://avatars-next.observableusercontent.com/fa41989f47bb986723af5b9c22176cb503748426f56e565000ea93acd9eab86c","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Embind test","cells":[{"id":213,"value":"md`# Embind test`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":145,"value":"md`The library embedded as a file attachment in this notebook has been compiled with \\`embind\\` with the options:\n\n\\`\\`\\`\nemcc -Os -std=c++17 --llvm-lto 1 -s ALLOW_MEMORY_GROWTH=1 -s WASM=1 \\\\\n -s MODULARIZE=1 --bind -s 'EXPORT_NAME=\"Library\"' -s SINGLE_FILE=1\n\\`\\`\\`\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":163,"value":"md`This loads the library from a file attachment:`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":0,"value":"Initialize = require(await FileAttachment(\"library@5.js\").url())","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":170,"value":"md`This confirms \\`Initialize\\` is basically the function we expect it to be:`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":160,"value":"Initialize.toString()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":175,"value":"md`I'd expect to be able to initialize the module this way, but this hangs indefinitely and I have to restart the browser:`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":133,"value":"Library = {\n // Solution:\n const module = Initialize();\n delete module.then;\n return module;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":178,"value":"md`However, the code runs fine if I download [\\`library@5.js\\`](${await FileAttachment(\n \"library@5.js\"\n).url()}) and run this script either in \\`node\\` or via a simple browserifying server like [\\`budo\\`](https://github.com/mattdesl/budo):\n\\`\\`\\`js\nvar Initialize = require('./library@5.js');\n\nInitialize().then(function (Lib) {\n var matrix = new Lib.MatrixXf(2, 3); \n console.log(\\`matrix dimensions: \\${matrix.rows()} x \\${matrix.cols()}\\`);\n})\n\\`\\`\\``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":201,"value":"$2f","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W30","stdlib":"1","titling":"auto"}} 2e:"$2d:body"