std::basic_ios::setstate

 

C++

Language

Standard library headers

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Utilities library

Strings library

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Algorithms library

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Numerics library

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Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Input/output library

I/O manipulators

C-style I/O

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basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecated)

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ios_base

basic_ios

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basic_ofstream

basic_fstream

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basic_ostringstream

basic_stringstream

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istrstream (deprecated)

ostrstream (deprecated)

strstream (deprecated)

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streamoff

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iostream_category (C++11)

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std::basic_ios

Member functions

basic_ios::basic_ios

basic_ios::~basic_ios

State functions

basic_ios::good

basic_ios::eof

basic_ios::fail

basic_ios::bad

basic_ios::operator!

basic_ios::operator bool

basic_ios::rdstate

basic_ios::setstate

basic_ios::clear

Formatting

basic_ios::copyfmt

basic_ios::fill

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basic_ios::exceptions

basic_ios::imbue

basic_ios::rdbuf

basic_ios::tie

basic_ios::narrow

basic_ios::widen

Protected member functions

basic_ios::init

basic_ios::move

basic_ios::swap

basic_ios::set_rdbuf

 

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.

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

Return value

(none)

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

See also

rdstate	returns state flags (public member function)
clear	clears error and eof flags (public member function)