Function hash
Takes an argument of an arbitrary type T and calculates the hash value.
size_t hash(T)
(
auto ref T key
);
Hash calculation is supported for all scalar types. Aggregate types, like
structs, should implement toHash-function:
size_t toHash() const
{
return hash;
} For pointers and for scalar types implicitly convertible to size_t this
is an identity operation (i.e. the value is cast to size_t and returned
unaltered). Integer types wider than size_t are XOR folded down to
size_t. Other scalar types use an architecture-dependent hash function
based on their width and alignment.
If the type provides a toHash-function, only toHash() is called and its
result is returned.
This function also accepts input ranges that contain hashable elements. Individual values are combined then and the resulting hash is returned.
Parameters
| Name | Description |
|---|---|
| T | Hashable type. |
| key | Hashable value. |
Returns
Calculated hash value.