rm obsolete casts

Core/Simulation/ISimulation.cpp

@@ -37,7 +37,7 @@ size_t getIndexStep(size_t total_size, size_t n_handlers)
 
 size_t getStartIndex(size_t n_handlers, size_t current_handler, size_t n_elements)
 {
-    const size_t handler_size = getIndexStep(n_elements, static_cast<size_t>(n_handlers));
+    const size_t handler_size = getIndexStep(n_elements, n_handlers);
     const size_t start_index = current_handler * handler_size;
     if (start_index >= n_elements)
         return n_elements;
@@ -46,7 +46,7 @@ size_t getStartIndex(size_t n_handlers, size_t current_handler, size_t n_element
 
 size_t batchSize(size_t n_handlers, size_t current_handler, size_t n_elements)
 {
-    const size_t handler_size = getIndexStep(n_elements, static_cast<size_t>(n_handlers));
+    const size_t handler_size = getIndexStep(n_elements, n_handlers);
     const size_t start_index = current_handler * handler_size;
     if (start_index >= n_elements)
         return 0;