看样子，thenInWorkerThread传递的参数是个函数，这个语法是怎么用的？[]里是什么作用？
  
   return asyncSystem.all(std::move(resolvedBuffers))
       .thenInWorkerThread(
           [pResult = std::move(pResult)](
               std::vector<ExternalBufferLoadResult>&& loadResults) mutable {
             for (auto& bufferResult : loadResults) {
               if (!bufferResult.success) {
                 pResult->warnings.push_back(
                     "Could not load the external gltf buffer: " +
                     bufferResult.bufferUri);
               }
             }
             return std::move(*pResult.release());
           });
  
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