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Diffstat (limited to 'libdimensionxx/dimensionxx/array.hpp')
-rw-r--r-- | libdimensionxx/dimensionxx/array.hpp | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/libdimensionxx/dimensionxx/array.hpp b/libdimensionxx/dimensionxx/array.hpp new file mode 100644 index 0000000..6f8c59a --- /dev/null +++ b/libdimensionxx/dimensionxx/array.hpp @@ -0,0 +1,108 @@ +/************************************************************************* + * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> * + * * + * This file is part of The Dimension Library. * + * * + * The Dimension Library is free software; you can redistribute it and/ * + * or modify it under the terms of the GNU Lesser General Public License * + * as published by the Free Software Foundation; either version 3 of the * + * License, or (at your option) any later version. * + * * + * The Dimension Library is distributed in the hope that it will be * + * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * <http://www.gnu.org/licenses/>. * + *************************************************************************/ + +#ifndef DIMENSIONXX_ARRAY_HPP +#define DIMENSIONXX_ARRAY_HPP + +#include <tr1/memory> + +// dmnsn_array* wrapper. + +namespace Dimension +{ + // Array template class, wraps a dmnsn_array*. Copying is possible, but + // copies refer to the same object, which is reference counted. T must be + // a POD type. + template <typename T> + class Array + { + public: + Array(); + explicit Array(dmnsn_array* array); + // Array(const Array& a); + ~Array(); + + // Array& operator=(const Array& a); + + // Access the wrapped C object. + dmnsn_array* dmnsn() { return *m_array; } + const dmnsn_array* dmnsn() const { return *m_array; } + + // Release ownership of the dmnsn_array*, needed for returning a + // dmnsn_array* from a function. + dmnsn_array* release(); + + private: + std::tr1::shared_ptr<dmnsn_array*> m_array; + }; + + // A constraint enforcing that T is a POD type by making it part of a union. + // Taking the address of this function will cause a compile-time failure if + // T is not a POD type. + template <typename T> + void + POD_constraint() + { + union + { + T t; + } constraint; + static_cast<void>(constraint); // Silence unused variable warning + } + + template <typename T> + Array<T>::Array() + : m_array(new dmnsn_array*(dmnsn_new_array(sizeof(T)))) + { + void (*constraint)() = &POD_constraint<T>; + static_cast<void>(constraint); // Silence unused variable warning + } + + template <typename T> + Array<T>::Array(dmnsn_array* array) + : m_array(new dmnsn_array*(array)) + { + void (*constraint)() = &POD_constraint<T>; + static_cast<void>(constraint); // Silence unused variable warning + } + + template <typename T> + Array<T>::~Array() + { + if (m_array.unique()) { + dmnsn_delete_array(*m_array); + } + } + + template <typename T> + dmnsn_array* + Array<T>::release() + { + if (!m_array.unique()) { + throw Dimension_Error("Attempting to release non-unique array."); + } + + dmnsn_array* array = *m_array; + m_array.reset(); + return array; + } +} + +#endif /* DIMENSIONXX_ARRAY_HPP */ |