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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2015 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// 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/.
#ifndef EIGEN_CXX11_TENSOR_TENSOR_META_H
#define EIGEN_CXX11_TENSOR_TENSOR_META_H
namespace Eigen {
template<bool cond> struct Cond {};
template<typename T1, typename T2> EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
const T1& choose(Cond<true>, const T1& first, const T2&) {
return first;
}
template<typename T1, typename T2> EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
const T2& choose(Cond<false>, const T1&, const T2& second) {
return second;
}
// Default packet types
template <typename Scalar, typename Device>
struct PacketType {
typedef typename internal::packet_traits<Scalar>::type type;
static const int size = internal::unpacket_traits<type>::size;
};
// For CUDA packet types when using a GpuDevice
#if defined(EIGEN_USE_GPU) && defined(__CUDACC__)
template <>
struct PacketType<float, GpuDevice> {
typedef float4 type;
static const int size = 4;
};
template <>
struct PacketType<double, GpuDevice> {
typedef double2 type;
static const int size = 2;
};
#endif
#if defined(EIGEN_HAS_CONSTEXPR)
#define EIGEN_CONSTEXPR constexpr
#else
#define EIGEN_CONSTEXPR
#endif
// Tuple mimics std::pair but works on e.g. nvcc.
template <typename U, typename V> struct Tuple {
public:
U first;
V second;
typedef U first_type;
typedef V second_type;
EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
Tuple() : first(), second() {}
EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
Tuple(const U& f, const V& s) : first(f), second(s) {}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
Tuple& operator= (const Tuple& rhs) {
if (&rhs == this) return *this;
first = rhs.first;
second = rhs.second;
return *this;
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
void swap(Tuple& rhs) {
using numext::swap;
swap(first, rhs.first);
swap(second, rhs.second);
}
};
template <typename U, typename V>
EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
bool operator==(const Tuple<U, V>& x, const Tuple<U, V>& y) {
return (x.first == y.first && x.second == y.second);
}
template <typename U, typename V>
EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
bool operator!=(const Tuple<U, V>& x, const Tuple<U, V>& y) {
return !(x == y);
}
#undef EIGEN_CONSTEXPR
} // namespace Eigen
#endif // EIGEN_CXX11_TENSOR_TENSOR_META_H
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