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std::ios_base::failure

From cppreference.com
< cpp‎ | io‎ | ios base
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.

cpp/error/exceptionstd-ios base-failure-2003-inheritance.svg
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Inheritance diagram

(until C++11)
cpp/error/exceptioncpp/error/runtime errorcpp/error/system errorstd-ios base-failure-inheritance.svg
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Inheritance diagram

(since C++11)

Contents

[edit] Member functions

(constructor)
constructs the exception object
(public member function) [edit]

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) [edit]
[virtual]
returns explanatory string
(virtual public member function of std::system_error) [edit]

Inherited from std::runtime_error


Inherited from std::exception

Member functions

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

[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
(enum) [edit]