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

void operator+=( const std::valarray<T>& other ) const;

void operator-=( const std::valarray<T>& other ) const;

void operator*=( const std::valarray<T>& other ) const;

void operator/=( const std::valarray<T>& other ) const;

void operator%=( const std::valarray<T>& other ) const;

void operator&=( const std::valarray<T>& other ) const;

void operator|=( const std::valarray<T>& other ) const;

void operator^=( const std::valarray<T>& other ) const;

void operator<<=( const std::valarray<T>& other ) const;

void operator>>=( const std::valarray<T>& other ) const;