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# Standard library header <valarray>

From cppreference.com
< cpp‎ | header

This header is part of the numeric library.

### [edit] Classes

valarray | numeric arrays and array slices (class template)
slice | BLAS-like slice of a valarray: starting index, length, stride (class) [edit]
slice_array | proxy to a subset of a valarray after applying a slice (class template) [edit]
gslice | generalized slice of a valarray: starting index, set of lengths, set of strides (class) [edit]
gslice_array | proxy to a subset of a valarray after applying a gslice (class template) [edit]
mask_array | proxy to a subset of a valarray after applying a boolean mask `operator[]` (class template) [edit]
indirect_array | proxy to a subset of a valarray after applying indirect `operator[]` (class template) [edit]

### [edit] Functions

##### Operations
std::swap(std::valarray) (C++11) | specializes the std::swap() algorithm (function template) [edit]
std::begin(std::valarray) (C++11) | specializes std::begin (function template) [edit]
std::end(std::valarray) (C++11) | specializes std::end (function template) [edit]
operator+operator-operator*operator/operator%operator&operator|operator^operator<<operator>>operator&&operator|| | applies binary operators to each element of two valarrays, or a valarray and a value (function template) [edit]
operator==operator!=operator<operator<=operator>operator>= | compares two valarrays or a valarray with a value (function template) [edit]
abs(std::valarray) | applies the function std::abs to each element of valarray (function template) [edit]
##### Exponential functions
exp(std::valarray) | applies the function std::exp to each element of valarray (function template) [edit]
log(std::valarray) | applies the function std::log to each element of valarray (function template) [edit]
log10(std::valarray) | applies the function std::log10 to each element of valarray (function template) [edit]
##### Power functions
pow(std::valarray) | applies the function std::pow to two valarrays or a valarray and a value (function template) [edit]
sqrt(std::valarray) | applies the function std::sqrt to each element of valarray (function template) [edit]
##### Trigonometric functions
sin(std::valarray) | applies the function std::sin to each element of valarray (function template) [edit]
cos(std::valarray) | applies the function std::cos to each element of valarray (function template) [edit]
tan(std::valarray) | applies the function std::tan to each element of valarray (function template) [edit]
asin(std::valarray) | applies the function std::asin to each element of valarray (function template) [edit]
acos(std::valarray) | applies the function std::acos to each element of valarray (function template) [edit]
atan(std::valarray) | applies the function std::atan to each element of valarray (function template) [edit]
atan2(std::valarray) | applies the function std::atan2 to a valarray and a value (function template) [edit]
##### Hyperbolic functions
sinh(std::valarray) | applies the function std::sinh to each element of valarray (function template) [edit]
cosh(std::valarray) | applies the function std::cosh to each element of valarray (function template) [edit]
tanh(std::valarray) | applies the function std::tanh to each element of valarray (function template) [edit]

### [edit] Synopsis

    #include <initializer_list>

    namespace std {
        template<class T> class valarray;       // An array of type T
        class slice;                            // a BLAS-like slice out of an array
        template<class T> class slice_array;
        class gslice;                           // a generalized slice out of an array
        template<class T> class gslice_array;
        template<class T> class mask_array;     // a masked array
        template<class T> class indirect_array; // an indirected array

        template<class T> void swap(valarray<T>&, valarray<T>&) noexcept;

        template<class T> valarray<T> operator* (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator* (const valarray<T>&, const T&);
        template<class T> valarray<T> operator* (const T&, const valarray<T>&);

        template<class T> valarray<T> operator/ (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator/ (const valarray<T>&, const T&);
        template<class T> valarray<T> operator/ (const T&, const valarray<T>&);

        template<class T> valarray<T> operator% (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator% (const valarray<T>&, const T&);
        template<class T> valarray<T> operator% (const T&, const valarray<T>&);

        template<class T> valarray<T> operator+ (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator+ (const valarray<T>&, const T&);
        template<class T> valarray<T> operator+ (const T&, const valarray<T>&);

        template<class T> valarray<T> operator- (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator- (const valarray<T>&, const T&);
        template<class T> valarray<T> operator- (const T&, const valarray<T>&);

        template<class T> valarray<T> operator^ (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator^ (const valarray<T>&, const T&);
        template<class T> valarray<T> operator^ (const T&, const valarray<T>&);

        template<class T> valarray<T> operator& (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator& (const valarray<T>&, const T&);
        template<class T> valarray<T> operator& (const T&, const valarray<T>&);

        template<class T> valarray<T> operator| (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator| (const valarray<T>&, const T&);
        template<class T> valarray<T> operator| (const T&, const valarray<T>&);

        template<class T> valarray<T> operator<<(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator<<(const valarray<T>&, const T&);
        template<class T> valarray<T> operator<<(const T&, const valarray<T>&);

        template<class T> valarray<T> operator>>(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> operator>>(const valarray<T>&, const T&);
        template<class T> valarray<T> operator>>(const T&, const valarray<T>&);

        template<class T> valarray<bool> operator&&(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator&&(const valarray<T>&, const T&);
        template<class T> valarray<bool> operator&&(const T&, const valarray<T>&);

        template<class T> valarray<bool> operator||(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator||(const valarray<T>&, const T&);
        template<class T> valarray<bool> operator||(const T&, const valarray<T>&);

        template<class T>
        valarray<bool> operator==(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator==(const valarray<T>&, const T&);
        template<class T> valarray<bool> operator==(const T&, const valarray<T>&);

        template<class T>
        valarray<bool> operator!=(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator!=(const valarray<T>&, const T&);
        template<class T> valarray<bool> operator!=(const T&, const valarray<T>&);

        template<class T>
        valarray<bool> operator< (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator< (const valarray<T>&, const T&);
        template<class T> valarray<bool> operator< (const T&, const valarray<T>&);

        template<class T>
        valarray<bool> operator> (const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator> (const valarray<T>&, const T&);
        template<class T> valarray<bool> operator> (const T&, const valarray<T>&);

        template<class T>
        valarray<bool> operator<=(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator<=(const valarray<T>&, const T&);
        template<class T> valarray<bool> operator<=(const T&, const valarray<T>&);

        template<class T>
        valarray<bool> operator>=(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<bool> operator>=(const valarray<T>&, const T&);
        template<class T> valarray<bool> operator>=(const T&, const valarray<T>&);

        template<class  T>  valarray<T> abs (const  valarray<T>&);
        template<class  T>  valarray<T> acos(const  valarray<T>&);
        template<class  T>  valarray<T> asin(const  valarray<T>&);
        template<class  T>  valarray<T> atan(const  valarray<T>&);

        template<class T> valarray<T> atan2(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> atan2(const valarray<T>&, const T&);
        template<class T> valarray<T> atan2(const T&, const valarray<T>&);

        template<class  T>  valarray<T> cos  (const  valarray<T>&);
        template<class  T>  valarray<T> cosh (const valarray<T>&);
        template<class  T>  valarray<T> exp  (const  valarray<T>&);
        template<class  T>  valarray<T> log  (const  valarray<T>&);
        template<class  T>  valarray<T> log10(const valarray<T>&);

        template<class T> valarray<T> pow(const valarray<T>&, const valarray<T>&);
        template<class T> valarray<T> pow(const valarray<T>&, const T&);
        template<class T> valarray<T> pow(const T&, const valarray<T>&);

        template<class T>  valarray<T> sin (const valarray<T>&);
        template<class T>  valarray<T> sinh(const valarray<T>&);
        template<class T>  valarray<T> sqrt(const valarray<T>&);
        template<class T>  valarray<T> tan (const valarray<T>&);
        template<class T>  valarray<T> tanh(const valarray<T>&);

        template<class T>  /*unspecified1*/ begin(valarray<T>& v);
        template<class T>  /*unspecified2*/ begin(const valarray<T>& v);
        template<class T>  /*unspecified1*/ end(valarray<T>& v);
        template<class T>  /*unspecified2*/ end(const valarray<T>& v);

    }

### [edit] std::valarray

    namespace std {
        template<class T> class valarray {
        public:
            typedef T value_type;

            // 26.6.2.2 construct/destroy:
            valarray();
            explicit valarray(size_t);
            valarray(const T&, size_t);
            valarray(const T*, size_t);
            valarray(const valarray&);
            valarray(valarray&&) noexcept;
            valarray(const slice_array<T>&);
            valarray(const gslice_array<T>&);
            valarray(const mask_array<T>&);
            valarray(const indirect_array<T>&);
            valarray(initializer_list<T>);

            ~valarray();

            // 26.6.2.3 assignment:
            valarray<T>& operator=(const valarray<T>&);
            valarray<T>& operator=(valarray<T>&&) noexcept;
            valarray& operator=(initializer_list<T>);
            valarray<T>& operator=(const T&);
            valarray<T>& operator=(const slice_array<T>&);
            valarray<T>& operator=(const gslice_array<T>&);
            valarray<T>& operator=(const mask_array<T>&);
            valarray<T>& operator=(const indirect_array<T>&);

            // 26.6.2.4 element access:
            const T&        operator[](size_t) const;
            T&              operator[](size_t);

            // 26.6.2.5 subset operations:
            valarray<T>             operator[](slice) const;
            slice_array<T>          operator[](slice);
            valarray<T>             operator[](const gslice&) const;
            gslice_array<T>         operator[](const gslice&);
            valarray<T>             operator[](const valarray<bool>&) const;
            mask_array<T>           operator[](const valarray<bool>&);
            valarray<T>             operator[](const valarray<size_t>&) const;
            indirect_array<T>       operator[](const valarray<size_t>&);

            // 26.6.2.6 unary operators:
            valarray<T> operator+() const;
            valarray<T> operator-() const;
            valarray<T> operator~() const;
            valarray<bool> operator!() const;

            // 26.6.2.7 computed assignment:
            valarray<T>& operator*= (const T&);
            valarray<T>& operator/= (const T&);
            valarray<T>& operator%= (const T&);
            valarray<T>& operator+= (const T&);
            valarray<T>& operator-= (const T&);
            valarray<T>& operator^= (const T&);
            valarray<T>& operator&= (const T&);
            valarray<T>& operator|= (const T&);
            valarray<T>& operator<<=(const T&);
            valarray<T>& operator>>=(const T&);

            valarray<T>& operator*= (const valarray<T>&);
            valarray<T>& operator/= (const valarray<T>&);
            valarray<T>& operator%= (const valarray<T>&);
            valarray<T>& operator+= (const valarray<T>&);
            valarray<T>& operator-= (const valarray<T>&);
            valarray<T>& operator^= (const valarray<T>&);
            valarray<T>& operator|= (const valarray<T>&);
            valarray<T>& operator&= (const valarray<T>&);
            valarray<T>& operator<<=(const valarray<T>&);
            valarray<T>& operator>>=(const valarray<T>&);

            // 26.6.2.8 member functions:
            void swap(valarray&) noexcept;

            size_t size() const;

            T sum() const;
            T min() const;
            T max() const;

            valarray<T> shift (int) const;
            valarray<T> cshift(int) const;
            valarray<T> apply(T func(T)) const;
            valarray<T> apply(T func(const T&)) const;
            void resize(size_t sz, T c = T());
        };
    }

### [edit] std::slice

    namespace std {
        class slice {
        public:
            slice();
            slice(size_t, size_t, size_t);

            size_t start() const;
            size_t size() const;
            size_t stride() const;
        };
    }

### [edit] std::slice_array

    namespace std {
    template <class T> class slice_array {
        public:
            typedef T value_type;

            void operator=  (const valarray<T>&) const;
            void operator*= (const valarray<T>&) const;
            void operator/= (const valarray<T>&) const;
            void operator%= (const valarray<T>&) const;
            void operator+= (const valarray<T>&) const;
            void operator-= (const valarray<T>&) const;
            void operator^= (const valarray<T>&) const;
            void operator&= (const valarray<T>&) const;
            void operator|= (const valarray<T>&) const;
            void operator<<=(const valarray<T>&) const;
            void operator>>=(const valarray<T>&) const;

            slice_array(const slice_array&);
            ~slice_array();

            const slice_array& operator=(const slice_array&) const;
            void operator=(const T&) const;

            slice_array() = delete;
            // as implied by declaring copy constructor above
        };
    }

### [edit] std::gslice

    namespace std {
        class gslice {
        public:
            gslice();
            gslice(size_t s, const valarray<size_t>& l, const valarray<size_t>& d);

            size_t           start()  const;
            valarray<size_t> size()   const;
            valarray<size_t> stride() const;
        };
    }

### [edit] std::gslice_array

    namespace std {
        template <class T> class gslice_array {
        public:
            typedef T value_type;
            void operator=  (const valarray<T>&) const;
            void operator*= (const valarray<T>&) const;
            void operator/= (const valarray<T>&) const;
            void operator%= (const valarray<T>&) const;
            void operator+= (const valarray<T>&) const;
            void operator-= (const valarray<T>&) const;
            void operator^= (const valarray<T>&) const;
            void operator&= (const valarray<T>&) const;
            void operator|= (const valarray<T>&) const;
            void operator<<=(const valarray<T>&) const;
            void operator>>=(const valarray<T>&) const;

            gslice_array(const gslice_array&);
            ~gslice_array();
            const gslice_array& operator=(const gslice_array&) const;
            void operator=(const T&) const;

            gslice_array() = delete;        // as implied by declaring copy constructor above
        };
    }

### [edit] std::mask_array

    namespace std {
        template <class T> class mask_array {
        public:
            typedef T value_type;

            void operator= (const valarray<T>&) const;
            void operator*= (const valarray<T>&) const;
            void operator/= (const valarray<T>&) const;
            void operator%= (const valarray<T>&) const;
            void operator+= (const valarray<T>&) const;
            void operator-= (const valarray<T>&) const;
            void operator^= (const valarray<T>&) const;
            void operator&= (const valarray<T>&) const;
            void operator|= (const valarray<T>&) const;
            void operator<<=(const valarray<T>&) const;
            void operator>>=(const valarray<T>&) const;

            mask_array(const mask_array&);
            ~mask_array();
            const mask_array& operator=(const mask_array&) const;
            void operator=(const T&) const;

            mask_array() = delete;        // as implied by declaring copy constructor above
        };
    }

### [edit] std::indirect_array

    namespace std {
        template <class T> class indirect_array {
        public:
            typedef T value_type;

            void operator=  (const valarray<T>&) const;
            void operator*= (const valarray<T>&) const;
            void operator/= (const valarray<T>&) const;
            void operator%= (const valarray<T>&) const;
            void operator+= (const valarray<T>&) const;
            void operator-= (const valarray<T>&) const;
            void operator^= (const valarray<T>&) const;
            void operator&= (const valarray<T>&) const;
            void operator|= (const valarray<T>&) const;
            void operator<<=(const valarray<T>&) const;
            void operator>>=(const valarray<T>&) const;

            indirect_array(const indirect_array&);
            ~indirect_array();
            const indirect_array& operator=(const indirect_array&) const;
            void operator=(const T&) const;

            indirect_array() = delete; // as implied by declaring copy constructor above
        };
    }

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