[header][other] system_error (C++11)

*[header][other] system_error (C++11)

<system_error>

System errors

This header defines a series of standardized elements to report error conditions originating from the operating system or other low-level operations.

Most such errors are identified by a single integer value, which is sometimes system-specific. The class error_codeencapsulates and preserves these system-generated values associating them with an error_category.

These objects can be compared against objects of type error_condition, which is a very similar type meant to represent the same errors, but in a portable way. In this way, library calls to the system may produce error_code values (which preserve system-specific values), and programs can compare them against error_condition objects (which are portable between systems).

error_category objects identify different sets of error codes and also determine the correspondences between error codes and error conditions.

This header defines two categories: generic_category and a system_category. Other libraries may define additional error categories (such as the standard iostream_category, defined in <ios>).

The class system_error is a standard exception type that carries an error_code object.

Classes

error_category

Error category (abstract class )

error_code

Error code (class )

error_condition

Error condition (class )

system_error

System error exception (class )

Trait classes:

is_error_code_enum

error_code enum flag (class )

is_error_condition_enum

error_condition enum flag (class )

Enum classes:

errc

Generic error conditions (enum class )

Functions

Categories:

generic_category

Return generic category (function )

system_category

Return system category (function )

Constructor helpers:

make_error_code

Make error code (function )

make_error_condition

Make error condition (function )

내용 출처 : http://www.cplusplus.com/reference/system_error/