std::valarray<T>::operator+,-,~,!

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valarray::operator+valarray::operator-valarray::operator~valarray::operator!
valarray::operator+=valarray::operator-=valarray::operator*=valarray::operator/=valarray::operator%=valarray::operator&=valarray::operator\|=valarray::operator^=valarray::operator<<=valarray::operator>>=

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swap(std::valarray) (C++11)
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operator*operator/operator%operator+operator-operator^operator&operator\|operator<<operator>>operator&&operator\|\|
operator==operator!=operator<operator>operator<=operator>=

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slice
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Deduction guides(C++17)

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valarray<T> operator+()const;	(1)
valarray<T> operator-()const;	(2)
valarray<T> operator~()const;	(3)
valarray<bool> operator!()const;	(4)

Applies unary operators to each element in the numeric array.

[edit]Parameters

(none)

[edit]Return value

A numeric array containing elements with values obtained by applying corresponding operator to the values in*this.

[edit]Exceptions

May throw implementation-defined exceptions.

[edit]Notes

Each of the operators can only be instantiated if the following requirements are met:

The indicated operator can be applied to typeT.
The result value can be unambiguously converted toT (1-3) orbool (4).

The function can be implemented with the return type different fromstd::valarray. In this case, the replacement type has the following properties:

Allconst member functions ofstd::valarray are provided.
std::valarray,std::slice_array,std::gslice_array,std::mask_array andstd::indirect_array can be constructed from the replacement type.
For every function taking aconststd::valarray<T>&exceptbegin() andend()(since C++11), identical functions taking the replacement types shall be added;
For every function taking twoconststd::valarray<T>& arguments, identical functions taking every combination ofconststd::valarray<T>& and replacement types shall be added.
The return type does not add more than two levels of template nesting over the most deeply-nested argument type.

[edit]Example

Run this code

#include <iostream>#include <string_view>#include <valarray> template<typename T>void print(std::string_viewconst note,std::valarray<T>const vala,// by-value, see Notes abovestd::string_viewconst term="\n"){std::cout<< note<<std::boolalpha<<std::showpos;for(Tconst element: vala)std::cout<<'\t'<< element;std::cout<< term;} int main(){std::valarray<int> x{1,2,3,4};    print<int>("x: ", x);    print<int>("+x: ",+x);    print<int>("+ + x: ",++ x);    print<int>("-x: ",-x);    print<int>("- - x: ",-- x,"\n\n"); std::valarray<short> y{0,1,-1,0x7fff};    print<short>("y: ", y);    print<short>("~y: ", ~y);    print<short>("~~y: ", ~~y,"\n\n"); std::valarray<bool> z{true,false};    print<bool>("z: ", z);    print<bool>("!z: ",!z);    print<bool>("!!z: ",!!z);}

Possible output:

x:      +1      +2      +3      +4+x:     +1      +2      +3      +4+ + x:  +1      +2      +3      +4-x:     -1      -2      -3      -4- - x:  +1      +2      +3      +4 y:      +0      +1      -1      +32767~y:     -1      -2      +0      -32768~~y:    +0      +1      -1      +32767 z:      true    false!z:     false   true!!z:    true    false

[edit]See also

operator+=operator-=operator*=operator/=operator%=operator&=operator\|=operator^=operator<<=operator>>=	applies compound assignment operator to each element of the valarray (public member function)[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]