std::basic_ios<CharT,Traits>::setstate
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Input/output library
Print functions (C++23)
Buffers
(C++23)
(C++98/26*)
(C++20)
Streams
Abstractions
File I/O
String I/O
Array I/O
(C++23)
(C++23)
(C++23)
(C++98/26*)
(C++98/26*)
(C++98/26*)
Synchronized Output
(C++20)
Types
Error category interface
(C++11)
(C++11)
std::basic_ios
Member functions
State functions
basic_ios::setstate
Formatting
Miscellaneous
Protected member functions
(C++11)
(C++11)
(C++11)
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.
Contents
[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