std::ios_base::failure

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C++ Standard Library
Input/output library
ios_base::failure
Member functions
failure::failure
Defined in header <ios>

class failure : public std::exception;
 (until C++11)
class failure : public std::system_error;
 (since C++11)

The class std::ios_base::failure defines an exception object that is thrown on failure by the functions in the Input/Output library.

Contents

[edit] Member functions

constructs the exception object
(public member function)

Inherited from std::system_error

Member functions

[virtual]
 returns error code
(virtual 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

[virtual]
 destructs the exception object
(virtual public member function of std::exception)
[virtual]
 returns explanatory string
(virtual public member function of std::exception)

[edit] 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

[edit] See also

(C++11)
 the IO stream error codes
(class)
Retrieved from "http://en.cppreference.com/w/cpp/io/ios_base/failure"