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C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)    
(C++20)
Swap and type operations
(C++20)
(C++14)
(C++11)
(C++23)
(C++11)
(C++23)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++11)
(C++17)
(C++17)
(C++23)



 
Diagnostics library
 
std::error_condition
 
Defined in header <system_error> 
template<> struct hash<std::error_condition>;
(since C++17)

The template specialization of std::hash for std::error_condition allows users to obtain hashes of objects of type std::error_condition.