Re: Feature to get or add value to an associative array.

[Giles Bathgate via Digitalmars-d]

On Tuesday, 17 April 2018 at 21:40:55 UTC, Giles Bathgate wrote:

Rust calls its version of this function `or_insert_with` (blegh)

Of course, a rustic API could be built atop this PR:

template entry(K, V)
{
    static struct Entry
    {
        alias get this;
        V[K] aa;
        K key;
        V get()
        {
            return aa[key];
        }
        V orInsert()
        {
            return aa.getOrAdd(key);
        }
        V orInsertWith(lazy V value = V.init)
        {
            return aa.getOrAdd(key, value);
        }
    }

    Entry entry(ref V[K] aa, K key)
    {
        return Entry(aa,key);
    }
}


void main()
{
    class C{}
    C[string] aa;
    auto v1 = aa.entry("foo");
    auto v2 = aa.entry("bar").orInsert();
    auto v3 = aa.entry("baz").orInsertWith(new C);
}

But I think, this would be out of scope.