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// filebuf::is_open() example
#include <iostream>
#include <fstream>
int main () {
std::ifstream is;
std::filebuf * fb = is.rdbuf();
fb->open ("test.txt",std::ios::in);
if ( fb->is_open() )
std::cout << "the file is open.\n";
else
std::cout << "the file is not open.\n";
fb->close();
return 0;
}
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