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111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2001-2002 Vivid Solutions Inc.
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* Copyright (C) 2006 Refractions Research Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************
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*
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* Utility header to retain a bit of backward compatibility.
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* Try to avoid including this header directly.
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*
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**********************************************************************/
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#ifndef GEOS_UTIL_H
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#define GEOS_UTIL_H
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//#include <geos/util/AssertionFailedException.h>
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#include <geos/util/GEOSException.h>
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#include <geos/util/IllegalArgumentException.h>
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#include <geos/util/TopologyException.h>
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//#include <geos/util/UnsupportedOperationException.h>
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//#include <geos/util/CoordinateArrayFilter.h>
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//#include <geos/util/UniqueCoordinateArrayFilter.h>
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#include <geos/util/GeometricShapeFactory.h>
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//#include <geos/util/math.h>
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#include <memory>
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#include <type_traits>
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//
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// Private macros definition
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//
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namespace geos {
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template<class T>
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void
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ignore_unused_variable_warning(T const &) {}
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namespace detail {
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#if __cplusplus >= 201402L
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using std::make_unique;
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#else
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// Backport of std::make_unique to C++11
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// Source: https://stackoverflow.com/a/19472607
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template<class T>
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struct _Unique_if {
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typedef std::unique_ptr<T> _Single_object;
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};
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template<class T>
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struct _Unique_if<T[]> {
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typedef std::unique_ptr<T[]> _Unknown_bound;
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};
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template<class T, size_t N>
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struct _Unique_if<T[N]> {
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typedef void _Known_bound;
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};
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template<class T, class... Args>
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typename _Unique_if<T>::_Single_object
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make_unique(Args &&... args) {
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return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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template<class T>
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typename _Unique_if<T>::_Unknown_bound
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make_unique(size_t n) {
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typedef typename std::remove_extent<T>::type U;
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return std::unique_ptr<T>(new U[n]());
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}
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template<class T, class... Args>
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typename _Unique_if<T>::_Known_bound
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make_unique(Args &&...) = delete;
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#endif
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/** Use detail::down_cast<Derived*>(pointer_to_base) as equivalent of
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* static_cast<Derived*>(pointer_to_base) with safe checking in debug
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* mode.
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*
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* Only works if no virtual inheritance is involved.
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*
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* @param f pointer to a base class
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* @return pointer to a derived class
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*/
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template<typename To, typename From> inline To down_cast(From* f)
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{
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static_assert(
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(std::is_base_of<From,
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typename std::remove_pointer<To>::type>::value),
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"target type not derived from source type");
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#if GEOS_DEBUG
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assert(f == nullptr || dynamic_cast<To>(f) != nullptr);
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#endif
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return static_cast<To>(f);
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}
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} // namespace detail
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} // namespace geos
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#endif // GEOS_UTIL_H
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