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# <valarray>

**Visual Studio 2015**

The latest version of this topic can be found at <valarray>.

Defines the template class valarray and numerous supporting template classes and functions.

#include <valarray>

These template classes and functions are permitted unusual latitude in the interest of improved performance. Specifically, any function returning type **valarray<**T1**>** may return an object of some other type T2. In that case, any function that accepts one or more arguments of type **valarray<**T2**>** must have overloads that accept arbitrary combinations of those arguments, each replaced with an argument of type T2.

### Functions

abs | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the absolute value of the elements of the input valarray. |

acos | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the arccosine of the elements of the input valarray. |

asin | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the arcsine of the elements of the input valarray. |

atan | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the principal value of the arctangent of the elements of the input valarray. |

atan2 | Returns a valarray whose elements are equal to the arctangent of the Cartesian components specified by a combination of constants and elements of valarrays. |

cos | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the cosine of the elements of the input valarray. |

cosh | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the hyperbolic cosine of the elements of the input valarray. |

exp | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the natural exponential of the elements of the input valarray. |

log | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the natural logarithm of the elements of the input valarray. |

log10 | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the base 10 or common logarithm of the elements of the input valarray. |

pow | Operates on the elements of input valarrays and constants, returning a valarray whose elements are equal to a base specified either by the elements of an input valarray or a constant raised to an exponent specified either by the elements of an input valarray or a constant. |

sin | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the sine of the elements of the input valarray. |

sinh | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the hyperbolic sine of the elements of the input valarray. |

sqrt | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the square root of the elements of the input valarray. |

swap | |

tan | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the tangent of the elements of the input valarray. |

tanh | Operates on the elements of an input valarray, returning a valarray whose elements are equal to the hyperbolic tangent of the elements of the input valarray. |

### Operators

operator!= | Tests whether the corresponding elements of two equally sized valarrays are unequal or whether all the elements of a valarray are unequal a specified value of the valarray's element type. |

operator% | Obtains the remainder of dividing the corresponding elements of two equally sized valarrays or of dividing a valarray by a specified value of the valarray's element type or of dividing a specified value by a valarray. |

operator& | Obtains the bitwise AND between corresponding elements of two equally sized valarrays or between a valarray and a specified value of the element type. |

operator&& | Obtains the logical AND between corresponding elements of two equally sized valarrays or between a valarray and a specified value of the valarray's element type. |

operator> | Tests whether the elements of one valarray are greater than the elements of an equally sized valarray or whether all the elements of a valarray are greater or less than a specified value of the valarray's element type. |

operator>= | Tests whether the elements of one valarray are greater than or equal to the elements of an equally sized valarray or whether all the elements of a valarray are greater than or equal to or less than or equal to a specified value. |

operator>> | Right-shifts the bits for each element of a valarray a specified number of positions or by an element-wise amount specified by a second valarray. |

operator< | Tests whether the elements of one valarray are less than the elements of an equally sized valarray or whether all the elements of a valarray are greater or less than a specified value. |

operator<= | Tests whether the elements of one valarray are less than or equal to the elements of an equally sized valarray or whether all the elements of a valarray are greater than or equal to or less than or equal to a specified value. |

operator<< | Left shifts the bits for each element of a valarray a specified number of positions or by an element-wise amount specified by a second valarray. |

operator* | Obtains the element-wise product between corresponding elements of two equally sized valarrays or of between a valarray a specified value of the valarray's element type. |

operator+ | Obtains the element-wise sum between corresponding elements of two equally sized valarrays or of between a valarray a specified value of the valarray's element type. |

operator- | Obtains the element-wise difference between corresponding elements of two equally sized valarrays or of between a valarray a specified value of the valarray's element type. |

operator/ | Obtains the element-wise quotient between corresponding elements of two equally sized valarrays or of between a valarray a specified value of the valarray's element type. |

operator== | Tests whether the corresponding elements of two equally sized valarrays are equal or whether all the elements of a valarray are equal a specified value of the valarray's element type. |

operator^ | Obtains the bitwise exclusive `OR` between corresponding elements of two equally sized valarrays or between a valarray and a specified value of the element type. |

operator| | Obtains the bitwise `OR` between corresponding elements of two equally sized valarrays or between a valarray and a specified value of the element type. |

operator|| | Obtains the logical `OR` between corresponding elements of two equally sized valarrays or between a valarray and a specified value of the valarray's element type. |

### Classes

gslice Class | A utility class to valarray that is used to define multi-dimensional slices of a valarray. |

gslice_array Class | An internal, auxiliary template class that supports general slice objects by providing operations between subset arrays defined by the general slice of a valarray. |

indirect_array Class | An internal, auxiliary template class that supports objects that are subsets of valarrays by providing operations between subset arrays defined by specifying a subset of indices of a parent valarray. |

mask_array Class | An internal, auxiliary template class that supports objects that are subsets of parent valarrays, specified with a Boolean expression, by providing operations between the subset arrays. |

slice Class | A utility class to valarray that is used to define one-dimensional, vector-like subsets of a valarray. |

slice_array Class | An internal, auxiliary template class that supports slice objects by providing operations between subset arrays defined by the slice of a valarray. |

valarray Class | The template class describes an object that controls a sequence of elements of type Type that are stored as an array and designed for performing high-speed mathematical operations, optimized for computational performance. |

### Specializations

valarray<bool> Class | A specialized version of the template class valarray<Type> to elements of type `bool` . |

Header Files Reference

Thread Safety in the C++ Standard Library

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