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Reference

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<system_error>

classes
- C++11
  error_category
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  error_code
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  error_condition
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  is_error_code_enum
- C++11
  is_error_condition_enum
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  system_error
enum classes
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  errc
functions
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  generic_category
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  make_error_code
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  make_error_condition
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  system_category

Reference
<system_error>
is_error_code_enum

class

<system_error>

std::is_error_code_enum

template <class T>struct is_error_code_enum : public false_type {};

error_code enum flag

integral_constant
is_error_code_enum

This is a traits class to identify whether a particular type is an error code enum type, and thus can be used to construct or assign values to objects of type error_code.

The standard header only provides the default definition, which simply inherits from false_type. But it should be specialized as inheriting from true_type to enable the construction of error_code object from error code enum types. The standard error condition types io_errc and future_errc inherit true_type.

Template parameters

T: A type.

Member types

Inherited from integral_constant (is_false and is_true are typedefs of integral_constant instantiations):

member type	definition
`value_type`	`bool`
`type`	either `true_type` or `false_type`

Member constants

Inherited from integral_constant (is_false and is_true are typedefs of integral_constant instantiations):

member constant	definition
`value`	either `true` or `false`

Member functions

Inherited from integral_constant (is_false and is_true are typedefs of integral_constant instantiations):

operator bool: Returns value (public member function)

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classes

enum classes

functions

std::is_error_code_enum

Template parameters

Member types

Member constants

Member functions