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Showing content from https://cplusplus.com/reference/system_error/error_condition/operators/ below:

function

<system_error>

bool operator== (const error_condition& lhs, const error_condition& rhs) noexcept;bool operator!= (const error_condition& lhs, const error_condition& rhs) noexcept;bool operator<  (const error_condition& lhs, const error_condition& rhs) noexcept;

bool operator== (const error_condition& lhs, const error_code& rhs) noexcept;bool operator== (const error_code& lhs, const error_condition& rhs) noexcept;bool operator!= (const error_condition& lhs, const error_code& rhs) noexcept;bool operator!= (const error_code& lhs, const error_condition& rhs) noexcept;

Relational operators

When the comparison involves two objects of type error_condition:

• if they are of the same category, the function returns the result of applying the appropriate operator (==, !=, <) on their associated values.
• otherwise, the function returns the result of applying the operator (==, !=, <) to their categories.

These functions behave as if defined as:

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bool operator== (const error_condition& lhs, const error_condition& rhs) noexcept
{ return lhs.category()==rhs.category() && lhs.value()==rhs.value(); }
bool operator!= (const error_condition& lhs, const error_condition& rhs) noexcept
{ return !(lhs==rhs); }
bool operator<  (const error_condition& lhs, const error_condition& rhs) noexcept
{ return lhs.category()<rhs.category() || lhs.category()==rhs.category()&&lhs.value()<rhs.value(); }

bool operator== (const error_condition& lhs, const error_code& rhs) noexcept
{ return lhs.category().equivalent(lhs.value,rhs) || rhs.category().equivalent(lhs,rhs.value()); }
bool operator== (const error_code& lhs, const error_condition& rhs) noexcept
{ return lhs.category().equivalent(lhs.value,rhs) || rhs.category().equivalent(lhs,rhs.value()); }
bool operator!= (const error_condition& lhs, const error_code& rhs) noexcept { return !(lhs==rhs); }
bool operator!= (const error_code& lhs, const error_condition& rhs) noexcept { return !(lhs==rhs); }

lhs, rhs

Objects (to the left- and right-hand side of the operator, respectively).

error_condition::value

Error condition value (public member function)

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