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[valarray.comparison]
# 29 Numerics library [[numerics]](./#numerics)
## 29.6 Numeric arrays [[numarray]](numarray#valarray.comparison)
### 29.6.3 valarray non-member operations [[valarray.nonmembers]](valarray.nonmembers#valarray.comparison)
#### 29.6.3.2 Logical operators [valarray.comparison]
[🔗](#lib:operator==,valarray)
`template<class T> valarray<bool> operator==(const valarray<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 valarray<T>&);
template<class T> valarray<bool> operator> (const valarray<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 valarray<T>&);
template<class T> valarray<bool> operator&&(const valarray<T>&, const valarray<T>&);
template<class T> valarray<bool> operator||(const valarray<T>&, const valarray<T>&);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8229)
*Mandates*: The indicated operator can be applied to operands of type T and returns
a value of type bool or which can be unambiguously
implicitly converted to bool[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8235)
*Preconditions*: The two array arguments have the same length[.](#2.sentence-1)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8240)
*Returns*: A valarray<bool> whose length
is equal to the length of the array arguments[.](#3.sentence-1)
Each element of the returned
array is initialized with the result of applying the indicated
operator to the corresponding elements of the argument arrays[.](#3.sentence-2)
[🔗](#lib:operator==,valarray_)
`template<class T> valarray<bool> operator==(const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator==(const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator!=(const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator!=(const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator< (const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator< (const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator> (const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator> (const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator<=(const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator<=(const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator>=(const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator>=(const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator&&(const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator&&(const typename valarray<T>::value_type&,
const valarray<T>&);
template<class T> valarray<bool> operator||(const valarray<T>&,
const typename valarray<T>::value_type&);
template<class T> valarray<bool> operator||(const typename valarray<T>::value_type&,
const valarray<T>&);
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8293)
*Mandates*: The indicated operator can be applied to operands of type T and returns
a value of type bool or which can be unambiguously
implicitly converted to bool[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L8299)
*Returns*: A valarray<bool> whose
length is equal to the length of the array argument[.](#5.sentence-1)
Each element
of the returned array is initialized with the result of applying the
indicated operator to the corresponding element of the array and the non-array argument[.](#5.sentence-2)