Pure pedantry: Replace all ".size() == 0" with ".empty()".

o3d/plugin/idl/bounding_box.idl

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 117 matching lines @@
        frustum space.
    \return True if the box is in the frustum.
   %]
   [const] bool InFrustum(Vectormath::Aos::Matrix4 matrix);
 
   [verbatim=cpp_glue] %{
     void userglue_setter_marshaled(
         void* plugin_data,
         o3d::BoundingBox* _this,
         const std::vector<std::vector<float> >& values) {
-      if (values.size() == 0) {
+      if (values.empty()) {
         *_this = o3d::BoundingBox();
       } else if (values.size() != 2) {
         o3d::ServiceLocator* service_locator =
             static_cast<glue::_o3d::PluginObject*>(
                 plugin_data)->service_locator();
         O3D_ERROR(service_locator)
             << "BoundingBox: expected 2 values, got " << values.size();
       } else {
         for (std::vector<float>::size_type i = 0; i < values.size(); ++i) {
           if (values[i].size() != 3) {
@@ skipping 53 matching lines @@
   A Param which stores a BoundingBox.
 %]
 [nocpp, include="core/cross/param.h"] class ParamBoundingBox : Param {
   %[
     The BoundingBox stored by the Param.
   %]
   [getter, setter] BoundingBox value_;
 };
 
 }  // namespace o3d