valarray::operator-=
valarray::operator-=
valarray<T>& operator-=(const valarray<T>& x);
valarray<T>& operator-=(const T& x);
The member operator replaces each element I of *this with (*this)[I] - x[I]. It returns *this.
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valarray::operator-=
valarray<T>& operator-=(const valarray<T>& x);
valarray<T>& operator-=(const T& x);
The member operator replaces each element I of *this with (*this)[I] - x[I]. It returns *this.