bsl::hash

Empty base class for hashing. This class, and all explicit and partial specializations of this class, shall conform to the C++11 Hash Requirements (C++11 17.6.3.4, [hash.requirements]). Unless this template is explicitly specialized, it will use the default hash algorithm provided by bslh::Hash<> to supply hash values. In order to hash a user-defined type using bsl::hash, bsl::hash must be explicitly specialized for the type, or, preferably, hashAppend must be implemented for the type. For more details on hashAppend and bslh::Hash see the component bslh_hash.

Synopsis

Declared in <bslstl_hash.h>

template<class TYPE>
struct hash
    : BloombergLP::bslh::Hash<>

Base Classes

Name	Description
`BloombergLP::bslh::Hash<>`	This struct wraps the (template parameter) type `HASH_ALGORITHM` in an interface that satisfies the `hash` requirements of the C++11 standard.

Type Aliases

Name	Description
`HashAlgorithm`	Make the `HASH_ALGORITHM` template parameter available to clients.
`result_type`	The type of the hash value that will be returned by the function-call operator.

Member Functions

Name	Description
`operator()`	Function call operators

Specializations

Name	Description
`hash<bool>`	Specialization of `hash` for `bool` values.
`hash<char>`	Specialization of `hash` for `char` values.
`hash<std::thread::id>`
`hash<int>`	Specialization of `hash` for `int` values.
`hash<long>`	Specialization of `hash` for `long` values.
`hash<long long>`	Specialization of `hash` for `long long` values.
`hash<short>`	Specialization of `hash` for `short` values.
`hash<signed char>`	Specialization of `hash` for `signed` `char` values.
`hash<unsigned char>`	Specialization of `hash` for `unsigned` `char` values.
`hash<unsigned int>`	Specialization of `hash` for `unsigned` `int` values.
`hash<unsigned long>`	Specialization of `hash` for `unsigned` `long` values.
`hash<unsigned long long>`	Specialization of `hash` for `unsigned` `long long` values.
`hash<unsigned short>`	Specialization of `hash` for `unsigned` `short` values.
`hash<wchar_t>`	Specialization of `hash` for `wchar_t` values.
`hash<BSLSTL_KEY const>`	This class provides hashing functionality for constant key types, by delegating to the same function for non-constant key types.
`hash<basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>>`	Specialize `bsl::hash` for strings, including an overload for pointers to allow character arrays to be hashed without converting them first.

Derived Classes

Name	Description
`hash<BSLSTL_KEY const>`	This class provides hashing functionality for constant key types, by delegating to the same function for non-constant key types.