std::error_code::operator bool

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Utilities library

Type support (basic types, RTTI, type traits)

Dynamic memory management

Error handling

Program utilities

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Date and time

Function objects

initializer_list (C++11)

bitset

hash (C++11)

Relational operators

rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

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pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Swap, forward and move

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

Error handling

Exception handling

exception

uncaught_exception

exception_ptr (C++11)

make_exception_ptr (C++11)

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rethrow_exception (C++11)

nested_exception (C++11)

throw_with_nested (C++11)

rethrow_if_nested (C++11)

Exception handling failures

terminate

terminate_handler

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unexpected (deprecated)

bad_exception

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get_unexpected (C++11)(deprecated)

set_unexpected (deprecated)

Exception categories

logic_error

invalid_argument

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length_error

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underflow_error

Error codes

Error codes

errno

Assertions

assert

system_error facility

error_category (C++11)

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system_category (C++11)

error_condition (C++11)

errc (C++11)

error_code (C++11)

system_error (C++11)

 

std::error_code

Member functions

error_code::error_code

error_code::operator=

error_code::assign

Modifiers

error_code::clear

Observers

error_code::value

error_code::category

error_code::default_error_condition

error_code::message

error_code::operator bool

Non-member functions

operator< operator== operator!=

operator<<

Helper classes

is_error_code_enum

hash<std::error_code>

 

explicit operator bool() const;		(since C++11)

Checks if the error value is valid, i.e. non-zero.

Parameters

(none)

Return value

false if value() == 0, true otherwise.

Exceptions

noexcept specification:  

noexcept