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Diffstat (limited to 'include/o3tl/enumrange.hxx')
-rw-r--r-- | include/o3tl/enumrange.hxx | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/include/o3tl/enumrange.hxx b/include/o3tl/enumrange.hxx new file mode 100644 index 000000000..60f069c9f --- /dev/null +++ b/include/o3tl/enumrange.hxx @@ -0,0 +1,87 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * 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 . + */ + +#ifndef INCLUDED_O3TL_ENUMRANGE_HXX +#define INCLUDED_O3TL_ENUMRANGE_HXX + +namespace o3tl { + +/// +/// This is a container convenience class iterating over scoped enumerations. +/// +/// This assumes that the 'enum class' definition +/// - starts at zero +/// - has no holes in its sequence of values +/// - defines a value called LAST which refers to the greatest constant. +/// +/// Use like this: +/// enum class COLOR { RED, GREEN, BLUE, LAST=BLUE }; +/// for( auto e : o3tl::enumrange<Color>() ) +/// ....; +/// +/// \param T the 'enum class' type. +template< typename T> +class enumrange +{ +public: + class Iterator + { + public: + Iterator( int value ) : + m_value( value ) + { + } + + T operator*( void ) const + { + return static_cast<T>(m_value); + } + + void operator++( void ) + { + ++m_value; + } + + bool operator!=( Iterator rhs ) const + { + return m_value != rhs.m_value; + } + + private: + int m_value; + }; +}; + +template< typename T > +typename enumrange<T>::Iterator begin( enumrange<T> ) +{ + return typename enumrange<T>::Iterator( int(0) ); +} + +template< typename T > +typename enumrange<T>::Iterator end( enumrange<T> ) +{ + return typename enumrange<T>::Iterator( static_cast<int>(T::LAST) + 1 ); +} + +}; // namespace o3tl + +#endif /* INCLUDED_O3TL_ENUMRANGE_HXX */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |