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Function `object.hashOf`

Calculates the hash value of arg with an optional seed initial value. The result might not be equal to typeid(T).getHash(&arg).


						
				size_t hashOf(T)
				(
				

				  auto ref T arg,
				

				  size_t seed
				

				);
				

				

				size_t hashOf(T)
				(
				

				  auto ref T arg
				

				);

Parameters

Name	Description
arg	argument to calculate the hash value of
seed	optional `seed` value (may be used for hash chaining)

Return

calculated hash value of arg

Example

class MyObject
{
    size_t myMegaHash() const @safe pure nothrow
    {
        return 42;
    }
}
struct Test
{
    int a;
    string b;
    MyObject c;
    size_t toHash() const pure nothrow
    {
        size_t hash = a.hashOf();
        hash = b.hashOf(hash);
        size_t h1 = c.myMegaHash();
        hash = h1.hashOf(hash); //Mix two hash values
        return hash;
    }
}

Authors

Walter Bright, Sean Kelly

License

Boost License 1.0.