std::valarray<T>::operator+=,-=,*=,/=,%=,&=,|=,<<=,>>=

Applies compound assignment operators to each element in the numeric array.

# Declarations

valarray<T>& operator+=( const valarray<T>& v );
valarray<T>& operator-=( const valarray<T>& v );
valarray<T>& operator*=( const valarray<T>& v );
valarray<T>& operator/=( const valarray<T>& v );
valarray<T>& operator%=( const valarray<T>& v );
valarray<T>& operator&=( const valarray<T>& v );
valarray<T>& operator|=( const valarray<T>& v );
valarray<T>& operator^=( const valarray<T>& v );
valarray<T>& operator<<=( const valarray<T>& v );
valarray<T>& operator>>=( const valarray<T>& v );

valarray<T>& operator+=( const T& val );
valarray<T>& operator-=( const T& val );
valarray<T>& operator*=( const T& val );
valarray<T>& operator/=( const T& val );
valarray<T>& operator%=( const T& val );
valarray<T>& operator&=( const T& val );
valarray<T>& operator|=( const T& val );
valarray<T>& operator^=( const T& val );
valarray<T>& operator<<=( const T& val );
valarray<T>& operator>>=( const T& val );

# Parameters

# Return value

*this

# Notes

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

# Example

#include <iostream>
#include <string_view>
#include <type_traits>
#include <valarray>
 
void o(std::string_view rem, auto const& v, bool nl = false)
{
    if constexpr (std::is_scalar_v<std::decay_t<decltype(v)>>)
        std::cout << rem << " : " << v;
    else
    {
        for (std::cout << rem << " : { "; auto const e : v)
            std::cout << e << ' ';
        std::cout << '}';
    }
    std::cout << (nl ? "\n" : ";  ");
}
 
int main()
{
    std::valarray<int> x, y;
 
    o("x", x = {1, 2, 3, 4}), o("y", y = {4, 3, 2, 1}), o("x += y", x += y, 1);
    o("x", x = {4, 3, 2, 1}), o("y", y = {3, 2, 1, 0}), o("x -= y", x -= y, 1);
    o("x", x = {1, 2, 3, 4}), o("y", y = {5, 4, 3, 2}), o("x *= y", x *= y, 1);
    o("x", x = {1, 3, 4, 7}), o("y", y = {1, 1, 3, 5}), o("x &= y", x &= y, 1);
    o("x", x = {0, 1, 2, 4}), o("y", y = {4, 3, 2, 1}), o("x <<=y", x <<=y, 1);
 
    std::cout << '\n';
 
    o("x", x = {1, 2, 3, 4}), o("x += 5", x += 5, 1);
    o("x", x = {1, 2, 3, 4}), o("x *= 2", x *= 2, 1);
    o("x", x = {8, 6, 4, 2}), o("x /= 2", x /= 2, 1);
    o("x", x = {8, 4, 2, 1}), o("x >>=1", x >>=1, 1);
}

# See also