std::basic_ios::setstate

 

C++

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Input/output library

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basic_osyncstream (C++20)

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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

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basic_ios::operator!

basic_ios::operator bool

basic_ios::rdstate

basic_ios::setstate

basic_ios::clear

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basic_ios::copyfmt

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basic_ios::init

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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	modifies state flags (public member function)