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std::valarray – cppreference.com

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definiert in Header

<valarray>

template< class T > class valarray;

std::valarray ist die Klasse für die Darstellung und Manipulation von Arrays von Werten. Es unterstützt elementweise mathematische Operationen und verschiedene Formen von generalisierten tiefgestellte Operatoren, Aufschneiden und indirekten Zugang .

Original:

std::valarray is the class for representing and manipulating arrays of values. It supports element-wise mathematical operations and various forms of generalized subscript operators, slicing and indirect access.

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Notes

std::valarray und Hilfsklassen definiert sind frei von bestimmten Formen von Aliasing, so dass Operationen auf diesen Klassen optimiert ähnlich dem Effekt des Schlüsselworts werden restrict in der C-Programmiersprache. Darüber hinaus werden die Funktionen und Operatoren, die valarray Argumente dürfen Proxy-Objekte zurück, um es möglich, dass der Compiler einen Ausdruck wie v1 = a*v2 + v3; optimieren, wie einer einzelnen Schleife, v1[i] = a*v2[i] + v3[i]; Vermeidung von Provisorien oder mehrere Durchläufe ausführt. Jedoch machen Ausdruck Vorlagen gleich Optimierungstechnik Anzeigeprogramm für C + + Behälter, und die Mehrzahl der numerischen Bibliotheken bevorzugen Expression Vorlagen valarrays für Flexibilität. Einige C + +-Standard-Bibliothek-Implementierungen verwenden Vorlagen für Ausdrücke, um eine effiziente Operationen auf std::valarray implementieren (zB GNU libstdc + + und LLVM libc + +), und nur selten valarrays optimiert weiter, z. B. in Intel Parallel Studio .

Original:

std::valarray and helper classes are defined to be free of certain forms of aliasing, thus allowing operations on these classes to be optimized similar to the effect of the keyword restrict in the C programming language. In addition, functions and operators that take valarray arguments are allowed to return proxy objects to make it possible for the compiler to optimize an expression such as v1 = a*v2 + v3; as a single loop that executes v1[i] = a*v2[i] + v3[i]; avoiding any temporaries or multiple passes. However, Ausdruck Vorlagen make the same optimization technique available for any C++ container, and the majority of numeric libraries prefer expression templates to valarrays for flexibility. Some C++ standard library implementations use expression templates to implement efficient operations on std::valarray (e.g. GNU libstdc++ and LLVM libc++), and only rarely valarrays are optimized any further, e.g. in Intel Parallel Studio.

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Mitglied Typen

Mitglied Typ

Original:

Member type

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 Definition
value_type T

Member-Funktionen

baut neue numerische Array

Original:

constructs new numeric array

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(öffentliche Elementfunktion) [edit]

zerstört sich die numerische Array

Original:

destructs the numeric array

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(öffentliche Elementfunktion) [edit]

ordnet die Inhalte

Original:

assigns the contents

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(öffentliche Elementfunktion) [edit]

get / set valarray Element, Scheibe, oder Maske

Original:

get/set valarray element, slice, or mask

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(öffentliche Elementfunktion) [edit]

gilt eine unäre arithmetische Operator für jedes Element des valarray

Original:

applies a unary arithmetic operator to each element of the valarray

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(öffentliche Elementfunktion) [edit]

gilt Verbindung Zuweisungsoperator zu jedem Element des valarray

Original:

applies compound assignment operator to each element of the valarray

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(öffentliche Elementfunktion) [edit]

Swaps mit anderen valarray

Original:

swaps with another valarray

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(öffentliche Elementfunktion) [edit]

gibt die Größe der valarray

Original:

returns the size of valarray

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(öffentliche Elementfunktion) [edit]

ändert die Größe valarray

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changes the size of valarray

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(öffentliche Elementfunktion) [edit]

berechnet die Summe aller Elemente

Original:

calculates the sum of all elements

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(öffentliche Elementfunktion) [edit]

gibt das kleinste Element

Original:

returns the smallest element

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liefert den größten Element

Original:

returns the largest element

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(öffentliche Elementfunktion) [edit]

Nullfüllung verschieben die Elemente des valarray

Original:

zero-filling shift the elements of the valarray

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(öffentliche Elementfunktion) [edit]

Ringschieberegister der Elemente des valarray

Original:

circular shift of the elements of the valarray

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(öffentliche Elementfunktion) [edit]
applies a function to every element of a valarray
(öffentliche Elementfunktion) [edit]

Non-Member-Funktionen

spezialisiert die std::swap() Algorithmus

Original:

specializes the std::swap() algorithm

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(Funktions-Template) [edit]

spezialisiert std::begin

Original:

specializes std::begin

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spezialisiert std::end

Original:

specializes std::end

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(Funktions-Template) [edit]

gilt Binäroperatoren auf jedes Element von zwei valarrays oder ein valarray und einem Wert

Original:

applies binary operators to each element of two valarrays, or a valarray and a value

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(Funktions-Template) [edit]

vergleicht zwei valarrays oder eine valarray mit einem Wert

Original:

compares two valarrays or a valarray with a value

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(Funktions-Template) [edit]

wendet die Funktion std::abs auf jedes Element valarray

Original:

applies the function std::abs to each element of valarray

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(Funktions-Template) [edit]

Exponentialfunktionen

Original:

Exponential functions

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wendet die Funktion std::exp auf jedes Element valarray

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applies the function std::exp to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::log auf jedes Element valarray

Original:

applies the function std::log to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::log10 auf jedes Element valarray

Original:

applies the function std::log10 to each element of valarray

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Power-Funktionen

Original:

Power functions

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wendet die Funktion std::pow zwei valarrays oder valarray und einem Wert

Original:

applies the function std::pow to two valarrays or a valarray and a value

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(Funktions-Template) [edit]

wendet die Funktion std::sqrt auf jedes Element valarray

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applies the function std::sqrt to each element of valarray

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(Funktions-Template) [edit]

Trigonometrische Funktionen

Original:

Trigonometric functions

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wendet die Funktion std::sin auf jedes Element valarray

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applies the function std::sin to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::cos auf jedes Element valarray

Original:

applies the function std::cos to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::tan auf jedes Element valarray

Original:

applies the function std::tan to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::asin auf jedes Element valarray

Original:

applies the function std::asin to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::acos auf jedes Element valarray

Original:

applies the function std::acos to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::atan auf jedes Element valarray

Original:

applies the function std::atan to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::atan2 einer valarray und einem Wert

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applies the function std::atan2 to a valarray and a value

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(Funktions-Template) [edit]

Hyperbolische Funktionen

Original:

Hyperbolic functions

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wendet die Funktion std::sinh auf jedes Element valarray

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applies the function std::sinh to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::cosh auf jedes Element valarray

Original:

applies the function std::cosh to each element of valarray

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(Funktions-Template) [edit]

wendet die Funktion std::tanh auf jedes Element valarray

Original:

applies the function std::tanh to each element of valarray

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(Funktions-Template) [edit]

Helper-Klassen

BLAS-ähnliche Scheibe eines valarray: Startindex, Länge, Schritt

Original:

BLAS-like slice of a valarray: starting index, length, stride

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(Klasse) [edit]

Proxy auf eine Teilmenge eines valarray nach Anwendung einer Scheibe

Original:

proxy to a subset of a valarray after applying a slice

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(Klassen-Template) [edit]

generalisierte Scheibe eines valarray: Startindex, Längen eingestellt, der Fortschritte festgelegt

Original:

generalized slice of a valarray: starting index, set of lengths, set of strides

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(Klasse) [edit]

Proxy auf eine Teilmenge eines valarray nach Anwendung eines GSlice

Original:

proxy to a subset of a valarray after applying a gslice

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(Klassen-Template) [edit]

Proxy auf eine Teilmenge eines valarray nach Anwendung einer Booleschen Operator Maske []

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proxy to a subset of a valarray after applying a boolean mask operator[]

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(Klassen-Template) [edit]

Proxy auf eine Teilmenge eines valarray nach Anlegen indirekten Operator []

Original:

proxy to a subset of a valarray after applying indirect operator[]

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(Klassen-Template) [edit]