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# std::basic_ios::setstate

From cppreference.com
< cpp‎ | io‎ | basic ios

void setstate( iostate state ); |  |

Sets the stream error flags `state` in addition to currently set flags. Essentially calls clear(rdstate() | state). May throw an exception.

### [edit] Parameters

state | - | stream error state flags to set. It can be a combination of the following constants:
Constant | Explanation
`goodbit` | no error
`badbit` | irrecoverable stream error
`failbit` | input/output operation failed (formatting or extraction error)
`eofbit` | associated input sequence has reached end-of-file

### [edit] Return value

(none)

### [edit] Example

Run this code

    #include <iostream>
    #include <sstream>

    int main()
    {
        std::ostringstream stream;

        if (!stream.fail()) {
            std::cout << "stream is not fail\n";
        }

        stream.setstate(std::ios_base::failbit);

        if (stream.fail()) {
            std::cout << "now stream is fail\n";
        }

        if (!stream.good()) {
            std::cout << "and stream is not good\n";
        }
    }

Output:

    stream is not fail
    now stream is fail
    and stream is not good

### [edit] See also

rdstate | returns state flags (public member function) [edit]
clear | clears error and eof flags (public member function) [edit]

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