c++ - The parameter for the 'catch' -


this question has answer here:

i read "programming: principles , practice using c++" book (bjarne stroustrup). author writes:

catch (runtime_error e)

but writes:

catch (runtime_error& e)

as know, first variant creates copy of source, second uses link. or mistaken? not important "catch" in case?

i have expected of time, use:

catch ( runtime_error const& e )

the difference between catch value , catch reference same pass value , pass reference function parameter. important difference when catching reference, dynamic type can derived type, value result in slicing (because of copy).

also, if catch non-const reference, , modify exception object, rethrow, modified object propagate.


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