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Unwind Block of Blocks

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This commit is contained in:
Charles Schlosser
2023-08-29 17:21:41 +00:00
committed by Rasmus Munk Larsen
parent 81b48065ea
commit 18018ed013
3 changed files with 110 additions and 5 deletions
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48
Eigen/src/Core/util/XprHelper.h
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@@ -809,6 +809,54 @@ std::string demangle_flags(int f)
}
#endif
template<typename XprType>
struct is_block_xpr : std::false_type {};
template<typename XprType, int BlockRows, int BlockCols, bool InnerPanel>
struct is_block_xpr<Block<XprType, BlockRows, BlockCols, InnerPanel>> : std::true_type {};
template <typename XprType, int BlockRows, int BlockCols, bool InnerPanel>
struct is_block_xpr<const Block<XprType, BlockRows, BlockCols, InnerPanel>> : std::true_type {};
// Helper utility for constructing non-recursive block expressions.
template<typename XprType>
struct block_xpr_helper {
using BaseType = XprType;
// For regular block expressions, simply forward along the InnerPanel argument,
// which is set when calling row/column expressions.
static constexpr bool is_inner_panel(bool inner_panel) { return inner_panel; };
// Only enable non-const base function if XprType is not const (otherwise we get a duplicate definition).
template<typename T = XprType, typename EnableIf=std::enable_if_t<!std::is_const<T>::value>>
static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE BaseType& base(XprType& xpr) { return xpr; }
static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE const BaseType& base(const XprType& xpr) { return xpr; }
static constexpr EIGEN_ALWAYS_INLINE Index row(const XprType& /*xpr*/, Index r) { return r; }
static constexpr EIGEN_ALWAYS_INLINE Index col(const XprType& /*xpr*/, Index c) { return c; }
};
template<typename XprType, int BlockRows, int BlockCols, bool InnerPanel>
struct block_xpr_helper<Block<XprType, BlockRows, BlockCols, InnerPanel>> {
using BlockXprType = Block<XprType, BlockRows, BlockCols, InnerPanel>;
// Recursive helper in case of explicit block-of-block expression.
using NestedXprHelper = block_xpr_helper<XprType>;
using BaseType = typename NestedXprHelper::BaseType;
// For block-of-block expressions, we need to combine the InnerPannel trait
// with that of the block subexpression.
static constexpr bool is_inner_panel(bool inner_panel) { return InnerPanel && inner_panel; }
// Only enable non-const base function if XprType is not const (otherwise we get a duplicates definition).
template<typename T = XprType, typename EnableIf=std::enable_if_t<!std::is_const<T>::value>>
static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE BaseType& base(BlockXprType& xpr) { return NestedXprHelper::base(xpr.nestedExpression()); }
static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE const BaseType& base(const BlockXprType& xpr) { return NestedXprHelper::base(xpr.nestedExpression()); }
static constexpr EIGEN_ALWAYS_INLINE Index row(const BlockXprType& xpr, Index r) { return xpr.startRow() + NestedXprHelper::row(xpr.nestedExpression(), r); }
static constexpr EIGEN_ALWAYS_INLINE Index col(const BlockXprType& xpr, Index c) { return xpr.startCol() + NestedXprHelper::col(xpr.nestedExpression(), c); }
};
template<typename XprType, int BlockRows, int BlockCols, bool InnerPanel>
struct block_xpr_helper<const Block<XprType, BlockRows, BlockCols, InnerPanel>> : block_xpr_helper<Block<XprType, BlockRows, BlockCols, InnerPanel>> {};
} // end namespace internal