Standard library header <valarray>

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Atomic operations library (C++11)

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Filesystem library (C++17)

Technical Specifications

Standard Library header files

Language Support
<cstddef> <limits> <climits> <contract>	<cfloat> <cstdint> <new> <version>	<typeinfo> <exception> <initializer_list>	<csignal> <csetjmp> <cstdarg>
Concepts
<concepts>
Diagnostics
<stdexcept>	<cassert>	<cerrno>	<system_error>
General utilities
<utility> <memory> <memory_resource> <scoped_allocator> <compare>	<bitset> <tuple> <optional> <any> <variant>	<type_traits> <ratio> <chrono> <typeindex> <functional>	<ctime> <cstdlib>
Strings
<string> <string_view>	<cctype> <cwctype>	<cwchar> <cuchar>	<cstring> <charconv>
Localization
<locale>	<codecvt>	<clocale>
Containers
<span> <array> <vector>	<deque> <forward_list> <list>	<map> <set> <queue>	<unordered_map> <unordered_set> <stack>
Iterators
<iterator>
Algorithms
<algorithm>	<execution>
Numerics
<complex> <random>	<valarray> <numeric>	<cfenv> <cmath>	<bit>
Input/Output
<iosfwd> <ios> <iomanip> <streambuf>	<istream> <ostream> <iostream>	<sstream> <fstream> <syncstream>	<cstdio> <cinttypes> <strstream>
Regular expressions
<regex>
Filesystem support
<filesystem>
Thread support
<thread> <atomic>	<mutex> <shared_mutex>	<condition_variable> <future>
C compatibility
<ciso646> <cstdalign>	<cstdbool> <ccomplex>	<ctgmath>

This header is part of the numeric library.

Classes

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

Functions

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

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);


}

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());
    };
}

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;
    };
}

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
    };
}

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;
    };
}

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
    };
}

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
    };
}

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
    };
}