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Update ex13_31.h #201

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Update ex13_31.h #201

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3 changes: 3 additions & 0 deletions ch13/ex13_31.h
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,9 @@ void swap(HasPtr& lhs, HasPtr& rhs)
{
lhs.swap(rhs);
}
//Function swap(HasPtr&, HasPtr&) is actually never used. The notice is printed because '=' is called, and 'sort' doesn't call swap(HasPtr&, HasPtr&) at all.
//I saw a comment that might be the reason:
//swap(HasPtr&, HasPtr&) is used in quicksort, but 'sort' won't use quicksort when there are not enough elements in the container(insertionsort is used instead).

bool operator<(const HasPtr& lhs, const HasPtr& rhs)
{
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