Eigen/src/StlSupport/details.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Gael Guennebaud <g.gael@free.fr>
// Copyright (C) 2009 Hauke Heibel <hauke.heibel@googlemail.com>
//
// Eigen 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.
//
// Alternatively, you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// Eigen 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 or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.

#ifndef EIGEN_STL_DETAILS_H
#define EIGEN_STL_DETAILS_H

namespace Eigen {

	// This one is needed to prevent reimplementing the whole std::vector.
	template <class T>
	class aligned_allocator_indirection : public aligned_allocator<T>
	{
	public:
		typedef size_t    size_type;
		typedef ptrdiff_t difference_type;
		typedef T*        pointer;
		typedef const T*  const_pointer;
		typedef T&        reference;
		typedef const T&  const_reference;
		typedef T         value_type;

		template<class U>
		struct rebind
		{
			typedef aligned_allocator_indirection<U> other;
		};

		aligned_allocator_indirection() {}
		aligned_allocator_indirection(const aligned_allocator_indirection& ) : aligned_allocator<T>() {}
		aligned_allocator_indirection(const aligned_allocator<T>& ) {}
		template<class U>
		aligned_allocator_indirection(const aligned_allocator_indirection<U>& ) {}
		template<class U>
		aligned_allocator_indirection(const aligned_allocator<U>& ) {}
		~aligned_allocator_indirection() {}
	};

#ifdef _MSC_VER

	// sometimes, MSVC detects, at compile time, that the argument x
	// in std::vector::resize(size_t s,T x) won't be aligned and generate an error
	// even if this function is never called. Whence this little wrapper.
#define EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T) Eigen::ei_workaround_msvc_stl_support<T>
	template<typename T> struct ei_workaround_msvc_stl_support : public T
	{
		inline ei_workaround_msvc_stl_support() : T() {}
		inline ei_workaround_msvc_stl_support(const T& other) : T(other) {}
		inline operator T& () { return *static_cast<T*>(this); }
		inline operator const T& () const { return *static_cast<const T*>(this); }
		template<typename OtherT>
		inline T& operator=(const OtherT& other)
		{ T::operator=(other); return *this; }
		inline ei_workaround_msvc_stl_support& operator=(const ei_workaround_msvc_stl_support& other)
		{ T::operator=(other); return *this; }
	};

#else

#define EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T) T

#endif

}

#endif // EIGEN_STL_DETAILS_H