Checks if the file stream has an associated file.

Effectively callsrdbuf()->is_open().

[edit]Parameters

(none)

[edit]Return value

true if the file stream has an associated file,false otherwise.

[edit]Example

#include <fstream>#include <iostream>#include <string> // this file is called main.cpp bool file_exists(conststd::string& str){std::ifstream fs(str);return fs.is_open();} int main(){std::boolalpha(std::cout);std::cout<< file_exists("main.cpp")<<'\n'<< file_exists("strange_file")<<'\n';}

truefalse

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit]See also

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