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 /*  This file is part of the Vc library. {{{
 Copyright © 2015 Matthias Kretz <kretz@kde.org>
 
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 #ifndef VC_COMMON_MASK_H_
 #define VC_COMMON_MASK_H_
 
 #include "macros.h"
 
 namespace Vc_VERSIONED_NAMESPACE
 {
 /**
  * \class Mask mask.h <Vc/vector.h>
  * \ingroup Masks
  *
  * The main SIMD mask class.
  */
 template <typename T, typename Abi = VectorAbi::Best<T>> class Mask
 {
 public:
     /**
      * Returns the number of boolean components (\VSize{T}) in a mask of this type.
      *
      * The size of the mask. I.e. the number of boolean entries in the mask. Do not
      * make any assumptions about the size of masks.
      *
      * In addition, you can easily use if clauses that compare sizes. The compiler can
      * statically evaluate and fully optimize dead code away (very much like \#ifdef, but
      * with syntax checking).
      *
      * \returns The number of components (i.e. \VSize{T}) objects of this mask type store
      * and manipulate.
      */
     static constexpr size_t size() { return VectorTraits<T, Abi>::size(); }
     ///\copydoc size
     ///\deprecated Use Vc::Mask::size instead.
     static constexpr size_t Size = VectorTraits<T, Abi>::size();
 
     /**
      * Specifies the alignment requirement for aligned load and store calls for objects of
      * this mask type.
      */
     static constexpr size_t MemoryAlignment = VectorTraits<T, Abi>::maskMemoryAlignment();
 
     /// The ABI tag type of the current template instantiation.
     using abi = Abi;
 
     /**
      * The \c EntryType of masks is always \c bool, independent of \c T.
      */
     using EntryType = bool;
     /// \copydoc EntryType
     using value_type = EntryType;
 
     /// The reference wrapper type used for accessing individual mask components.
     using EntryReference = typename VectorTraits<T, Abi>::EntryReference;
     /// \copydoc EntryReference
     using value_reference = EntryReference;
 
     /**
      * The \c VectorEntryType, in contrast to \c EntryType, reveals information about the SIMD
      * implementation.
      * This type is useful for the \c sizeof operator in generic functions.
      */
     using VectorEntryType = typename VectorTraits<T, Abi>::VectorEntryType;
 
     /**\internal
      * The \c VectorType reveals the implementation-specific internal type used for the SIMD type.
      */
     using VectorType = typename VectorTraits<T, Abi>::VectorType;
     /**\internal
      * \copydoc VectorType
      */
     using vector_type = VectorType;
 
     /*
      * The associated Vector<T> type.
      */
     //using Vector = Vector<T, Abi>;
 
     /// \name Generators
     ///@{
     /**
      * Creates a new mask object initialized to zero/\c false.
      *
      * \returns A mask object with zero-initialized components.
      */
     Vc_INTRINSIC static Mask Zero();
 
     /**
      * Creates a mask object initialized to one/\c true.
      *
      * \returns A mask object with components initialized to \c true.
      */
     Vc_INTRINSIC static Mask One();
 
     /// Generate a mask object from booleans returned from the function \p gen.
     template <typename G> static Vc_INTRINSIC Mask generate(G &&gen);
     ///@}
 
     /// \name Compile-Time Constant Initialization
     ///@{
     /**
      * Construct a zero-initialized vector object.
      *
      * This constructor follows the behavior of the underlying \c bool type in that the
      * expression `bool()` zero-initializes the object (to \c false). On the other hand
      * the variable \c x in `bool x;` is uninitialized.
      * Since, for class types, both expressions call the default constructor `Mask<T> x`
      * must zero-initialize \c x as well.
      */
     Vc_INTRINSIC Mask() = default;
 
     /// Zero-initialize the new mask object (\c false).
     /// \see Vc::Zero, Zero()
     Vc_INTRINSIC explicit Mask(VectorSpecialInitializerZero);
 
     /// Initialize the new mask object to one (\c true).
     /// \see Vc::One, One()
     Vc_INTRINSIC explicit Mask(VectorSpecialInitializerOne);
     ///@}
 
     /// \name Conversion/Broadcast Constructors
     ///@{
     /**
      * Broadcast constructor.
      *
      * Set all components of the new mask object to \p b.
      *
      * \param b Determines the initial state of the mask.
      */
     Vc_INTRINSIC explicit Mask(bool b);
 
     /**
      * Implicit conversion from a compatible (equal \VSize{T} on every platform) mask
      * object.
      *
      * \param otherMask The mask to be converted.
      */
     template <typename U>
     Vc_INTRINSIC Mask(U &&otherMask,
                       Common::enable_if_mask_converts_implicitly<Mask, T, U> = nullarg);
 
 #if Vc_IS_VERSION_1
     /**
      * Explicit conversion (static_cast) from a mask object that potentially has a
      * different \VSize{T}.
      *
      * \param otherMask The mask to be converted.
      *
      * \internal This is implemented via simd_cast in scalar/simd_cast_caller.h
      */
     template <typename U>
     Vc_DEPRECATED(
         "use simd_cast instead of explicit type casting to convert between mask types")
         Vc_INTRINSIC_L
         explicit Mask(U &&otherMask, Common::enable_if_mask_converts_explicitly<T, U> =
                                          nullarg) Vc_INTRINSIC_R;
     ///@}
 #endif
 
     /**
      * \name Loads & Stores
      */
     ///@{
     /**
      * Load constructor from an array of \c bool.
      *
      * This constructor implements an explicit conversion from an array of booleans to a
      * mask object. It corresponds to a Vector load constructor.
      *
      * \param mem A pointer to the start of the array of booleans.
      * \see Mask(const bool *, Flags), load(const bool *)
      */
     Vc_ALWAYS_INLINE explicit Mask(const bool *mem);
     /**
      * Overload of the above with a load/store flag argument.
      *
      * \param mem A pointer to the start of the array of booleans.
      * \param flags Choose a combination of flags such as Vc::Aligned, Vc::Streaming,
      * Vc::Unaligned, Vc::PrefetchDefault, ...
      * \see load(const bool *, Flags)
      */
     template <typename Flags> Vc_ALWAYS_INLINE explicit Mask(const bool *mem, Flags flags);
 
     /**
      * Load the components of the mask from an array of \c bool.
      *
      * \param mem A pointer to the start of the array of booleans.
      * \see load(const bool *, Flags), Mask(const bool *)
      */
     Vc_ALWAYS_INLINE void load(const bool *mem);
     /**
      * Overload of the above with a load/store flag argument.
      *
      * \param mem A pointer to the start of the array of booleans.
      * \param flags Choose a combination of flags such as Vc::Aligned, Vc::Streaming,
      * Vc::Unaligned, Vc::PrefetchDefault, ...
      * \see Mask(const bool *, Flags)
      */
     template <typename Flags> Vc_ALWAYS_INLINE void load(const bool *mem, Flags flags);
 
     /**
      * Store the values of the mask to an array of \c bool.
      *
      * \param mem A pointer to the start of the array of booleans.
      * \see store(bool *, Flags)
      */
     Vc_ALWAYS_INLINE void store(bool *mem) const;
     /**
      * Overload of the above with a load/store flag argument.
      *
      * \param mem A pointer to the start of the array of booleans.
      * \param flags Choose a combination of flags such as Vc::Aligned, Vc::Streaming,
      * Vc::Unaligned, Vc::PrefetchDefault, ...
      */
     template <typename Flags> Vc_ALWAYS_INLINE void store(bool *mem, Flags flags) const;
     ///@}
 
     /// \name Comparison Operators
     ///@{
     /**
      * Returns whether the two masks are equal in all components.
      *
      * \param mask The other mask to compare against.
      * \returns A scalar boolean value that says whether all components of the two masks
      * are equal.
      *
      * \note If you expected a behavior similar to the compare operator of Vc::Vector,
      * consider that the bitwise operators already implement such functionality. There is
      * little use, typically, in having `a == b` return the same as `a ^ b`. In general,
      * it is more useful to query `all_of(a ^ b)` which is the same as this equality
      * operator.
      */
     Vc_ALWAYS_INLINE bool operator==(const Mask &mask) const;
 
     /**
      * Returns whether the two masks are different in at least one component.
      *
      * \param mask The other mask to compare against.
      * \returns A scalar boolean value that says whether at least one component of the two masks is different.
      *
      * \note `(a == b) == !(a != b)` holds
      * \see Mask::operator==(const Mask &)
      */
     Vc_ALWAYS_INLINE bool operator!=(const Mask &mask) const;
     ///@}
 
     /**
      * \name Logical and Binary Operators
      *
      * \brief Component-wise logical/binary operations on mask objects.
      *
      * The effect of logical and binary \c AND and \c OR is equivalent for mask types (as
      * it is for \c bool).
      */
     ///@{
 
     /// Returns the component-wise application of a logical \c AND to \p mask.
     Vc_ALWAYS_INLINE Mask operator&&(const Mask &mask) const;
     /// Returns the component-wise application of a binary \c AND to \p mask.
     Vc_ALWAYS_INLINE Mask operator&(const Mask &mask) const;
     /// Returns the component-wise application of a logical \c OR to \p mask.
     Vc_ALWAYS_INLINE Mask operator||(const Mask &mask) const;
     /// Returns the component-wise application of a binary \c OR to \p mask.
     Vc_ALWAYS_INLINE Mask operator|(const Mask &mask) const;
     /// Returns the component-wise application of a binary \c XOR to \p mask.
     Vc_ALWAYS_INLINE Mask operator^(const Mask &mask) const;
     /// Returns a mask with inverted components.
     Vc_ALWAYS_INLINE Mask operator!() const;
 
     /// Modifies the mask using an \c AND operation with \p mask.
     Vc_ALWAYS_INLINE Mask &operator&=(const Mask &mask);
     /// Modifies the mask using an \c OR operation with \p mask.
     Vc_ALWAYS_INLINE Mask &operator|=(const Mask &mask);
     /// Modifies the mask using an \c XOR operation with \p mask.
     Vc_ALWAYS_INLINE Mask &operator^=(const Mask &mask);
     ///@}
 
     /**
      * \name Reductions
      *
      * \see any_of, all_of, none_of, some_of
      */
     ///@{
 
     /// Returns a logical \c AND of all components.
     Vc_ALWAYS_INLINE bool isFull() const;
     /// Returns a logical \c OR of all components.
     Vc_ALWAYS_INLINE bool isNotEmpty() const;
     /// Returns \c true if components are \c false, \c false otherwise.
     Vc_ALWAYS_INLINE bool isEmpty() const;
     /// Returns `!isFull() && !isEmpty()`.
     Vc_ALWAYS_INLINE bool isMix() const;
     ///@}
 
     /**\internal
      * \name Internal Data Access
      */
     ///@{
     Vc_ALWAYS_INLINE bool data() const;
     Vc_ALWAYS_INLINE bool dataI() const;
     Vc_ALWAYS_INLINE bool dataD() const;
     ///@}
 
     /// \name Scalar Subscript Operators
     ///@{
     /**
      * Lvalue-reference-like access to mask entries.
      *
      * \param index Determines the boolean to be accessed.
      * \return a temporary proxy object referencing the \p index th entry of the mask.
      *
      * \warning This operator does not return an lvalue reference (to \c bool), but rather
      * a temporary (rvalue) object that mimics an lvalue reference (as much as is possible
      * with C++11/14).
      */
     Vc_ALWAYS_INLINE EntryReference operator[](size_t index);
 
     /**
      * Read-only access to mask entries.
      *
      * \param index Determines the boolean to be accessed.
      * \return The \p index th entry of the mask as a \c bool (rvalue).
      *
      * \warning This operator does not return an lvalue reference (to `const bool`), but
      * rather a temporary (rvalue) \c bool.
      */
     Vc_ALWAYS_INLINE EntryType operator[](size_t index) const;
     ///@}
 
     /// Returns how many components of the mask are \c true.
     Vc_ALWAYS_INLINE int count() const;
 
     /**
      * Returns the index of the first one in the mask.
      *
      * \returns the index of the first component that is \c true.
      *
      * \warning The return value is undefined if the mask is empty.
      *
      * Thus, unless `none_of(mask)`, `mask[mask.firstOne()] == true` holds and `mask[i] ==
      * false` for all `i < mask.firstOne()`.
      */
     Vc_ALWAYS_INLINE int firstOne() const;
 
     /**
      * Convert the boolean components of the mask into bits of an integer.
      *
      * \return An \c int where each bit corresponds to the boolean value in the mask.
      *
      * For example, the mask `[true, false, false, true]` results in a `9` (in binary: `1001`).
      */
     Vc_ALWAYS_INLINE int toInt() const;
 
     /// Returns a mask with components shifted by \p amount places.
     Vc_INTRINSIC Vc_PURE Mask shifted(int amount) const;
 
     Vc_FREE_STORE_OPERATORS_ALIGNED(alignof(Mask));
 
 private:
     VectorType d;
 };
 
 /**
  * \ingroup Utilities
  *
  * \name Boolean Reductions
  */
 //@{
 /** \ingroup Utilities
  *  Returns whether all entries in the mask \p m are \c true.
  */
 template<typename Mask> constexpr bool all_of(const Mask &m) { return m.isFull(); }
 /** \ingroup Utilities
  *  Returns \p b
  */
 constexpr bool all_of(bool b) { return b; }
 
 /** \ingroup Utilities
  *  Returns whether at least one entry in the mask \p m is \c true.
  */
 template<typename Mask> constexpr bool any_of(const Mask &m) { return m.isNotEmpty(); }
 /** \ingroup Utilities
  *  Returns \p b
  */
 constexpr bool any_of(bool b) { return b; }
 
 /** \ingroup Utilities
  *  Returns whether all entries in the mask \p m are \c false.
  */
 template<typename Mask> constexpr bool none_of(const Mask &m) { return m.isEmpty(); }
 /** \ingroup Utilities
  *  Returns \p !b
  */
 constexpr bool none_of(bool b) { return !b; }
 
 /** \ingroup Utilities
  *  Returns whether at least one entry in \p m is \c true and at least one entry in \p m is \c
  *  false.
  */
 template<typename Mask> constexpr bool some_of(const Mask &m) { return m.isMix(); }
 /** \ingroup Utilities
  *  Returns \c false
  */
 constexpr bool some_of(bool) { return false; }
 //@}
 }  // namespace Vc
 
 #endif  // VC_COMMON_MASK_H_
 
 // vim: foldmethod=marker

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