| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil -*- */ |
| #ifndef WW_STATICASSERT_HXX |
| #define WW_STATICASSERT_HXX |
| |
| /* |
| Lifted direct from: |
| Modern C++ Design: Generic Programming and Design Patterns Applied |
| Section 2.1 |
| by Andrei Alexandrescu |
| */ |
| namespace ww |
| { |
| template<bool> class compile_time_check |
| { |
| public: |
| compile_time_check(...) {} |
| }; |
| |
| template<> class compile_time_check<false> |
| { |
| }; |
| } |
| |
| /* |
| Similiar to assert, StaticAssert is only in operation when NDEBUG is not |
| defined. It will test its first argument at compile time and on failure |
| report the error message of the second argument, which must be a valid c++ |
| classname. i.e. no spaces, punctuation or reserved keywords. |
| */ |
| #ifndef NDEBUG |
| # define StaticAssert(test, errormsg) \ |
| do { \ |
| struct ERROR_##errormsg {}; \ |
| typedef ww::compile_time_check< (test) != 0 > tmplimpl; \ |
| tmplimpl aTemp = tmplimpl(ERROR_##errormsg()); \ |
| sizeof(aTemp); \ |
| } while (0) |
| #else |
| # define StaticAssert(test, errormsg) \ |
| do {} while (0) |
| #endif |
| |
| #endif |
| /* vi:set tabstop=4 shiftwidth=4 expandtab: */ |
