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

 

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std::valarray

Member functions
valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	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>>=
Non-member functions
swap(std::valarray) (C++11) begin(std::valarray) (C++11)   end(std::valarray) (C++11) abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator*operator/operator%operator+operator-operator^operator&operator|operator<<operator>>operator&&operator|| operator==operator!=operator<operator>operator<=operator>=
Helper classes
slice_array gslice_array indirect_array	slice gslice mask_array
Deduction guides(C++17)

 

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.

Parameters

(none)

Return value

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

Exceptions

May throw implementation-defined exceptions.

Notes

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

• The indicated operator can be applied to type T.
• The result value can be unambiguously converted to T (1-3) or bool (4).

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

• All const member functions of std::valarray are provided.
• std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
• For every function taking a conststd::valarray<T>&except begin() and end()(since C++11), identical functions taking the replacement types shall be added;
• For every function taking two conststd::valarray<T>& arguments, identical functions taking every combination of conststd::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.

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(T const 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

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)
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)