Can reading a character from the std::istream result in failbit being set?

[etrusks]

Can reading a character from the std::istream result in failbit being set?

#include <iostream>
#include <string>

int main()

    for(std::string str; std::getline(std::cin, str);)
    {
        //....
    }

    return 0;
}

Can this loop ever be terminated by the fact that failbit alone is being set (not eofbit and failbit together)?

[gunnerfunner]

try compiling your 'program' and check the error messages

[etrusks]

int main(){

    for(std::string str; std::getline(std::cin, str);)
    {
        //....
    }

    return 0;
}

That was not the important part anyway. Just want to know if reading into a single char can ever set a failbit unless EOF is reached :

char ch;
std::cin >> ch;

[JLBorges]

> Can this loop ever be terminated by the fact that failbit alone is being set (not eofbit and failbit together)?

In theory, only if str.max_size() characters have been extracted into the string and the next character in the input buffer is not '\n'

In practice, we can safely ignore this possibility; str.max_size() would be too huge.

#include <iostream>
#include <string>

int main()
{
    std::cout << std::string{}.max_size() << '\n' ;

    for(std::string str; std::getline(std::cin, str);)
    {
        //....
    }

    return 0;
}

http://coliru.stacked-crooked.com/a/9087c8dec0625f40
http://rextester.com/KMVUU53507


> Just want to know if reading into a single char can ever set a failbit unless EOF is reached :

No; if the failbit is set, the eofbit will also be set.

[etrusks]

Thank you very much man, much appreciated! :)