std::valarray<T>::swap
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std::valarray 
void swap( valarray& other );
 
 (until C++11)
void swap( valarray& other ) noexcept;
 
 (since C++11) 
Swaps the contents with those of other.
[edit] Parameters
 other
 -
 another valarray to swap the contents with
[edit] Return value
(none)