| Defined in header <ios> | ||
|---|---|---|
class failure; |
The class std::ios_base::failure defines an exception object that is thrown on failure by the functions in the Input/Output library.
std::ios_base::failure may be defined either as a member class of std::ios_base or as a synonym (typedef) for another class with equivalent functionality. (since C++17).
 Inheritance diagram. | (until C++11) |
 Inheritance diagram. | (since C++11) |
Member functions
| (constructor) | constructs the exception object (public member function) |
std::ios_base::failure::::failure
explicit failure( const std::string& message ); | (until C++11) | |
explicit failure( const std::string& message,
const std::error_code& ec = std::io_errc::stream ); | (since C++11) | |
explicit failure( const char* message,
const std::error_code& ec = std::io_errc::stream ); | (since C++11) |
Constructs the exception object using message as explanation string which can later be retrieved using what().
Parameters
| message | - | explanatory string |
Inherited from std::system_error
Member functions
| returns error code (public member function of std::system_error) | |
| [virtual] | returns explanatory string (virtual public member function of std::system_error) |
Inherited from std::runtime_error
Inherited from std::exception
Member functions
| (destructor)
[virtual] | destructs the exception object (virtual public member function of std::exception) |
| [virtual] | returns an explanatory string (virtual public member function of std::exception) |
Example
#include <iostream>
#include <fstream>
int main()
{
std::ifstream f("doesn't exist");
try {
f.exceptions(f.failbit);
} catch (const std::ios_base::failure& e)
{
std::cout << "Caught an ios_base::failure.\n"
<< "Explanatory string: " << e.what() << '\n'
<< "Error code: " << e.code() << '\n';
}
}Output:
Caught an ios_base::failure. Explanatory string: ios_base::clear: unspecified iostream_category error Error code: iostream:1
See also
| (C++11) | the IO stream error codes (enum) |
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