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Re: [CPROG] check om istream& er cin



Jeg takker

Nils Åke Ljunggren wrote:

Jeg kunne godt tænke mig at undersøge, om en input stream
    void f(istream& istr)
er cin eller en åben input fil.

if (&istr == &std::cin) ...
Dette virker perfekt !

Nedenstående vil se på senere


std::ifstream* ifstr_ptr;
if ((ifstr_ptr= dynamic_cast<std::ifstream*>(&ifstr)) && ifstr_ptr->is_open()) ...



Hej fra Nils!



 
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