bool is_open(); | (until C++11) | |
bool is_open() const; | (since C++11) |
Checks if the file stream has an associated file.
Effectively calls rdbuf()->is_open().
Parameters
(none).
Return value
true if the file stream has an associated file, false otherwise.
Example
#include <string>
#include <fstream>
#include <iostream>
//this file is called main.cpp
bool file_exists(const std::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';
}Possible output:
true false
See also
| opens a file and associates it with the stream (public member function) | |
| closes the associated file (public member function) |
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