C# defaultdict
12345678910111213141516171819202122232425262728
using System;
using System.Collections.Generic;
public class DefaultDictionary<TKey, TValue> : Dictionary<TKey, TValue> where TValue : new()
{
public new TValue this[TKey key]
{
get
{
TValue val;
if (!TryGetValue(key, out val))
{
val = new TValue();
Add(key, val);
}
return val;
}
set { base[key] = value; }
}
}
class MainClass {
static void Main() {
var d = new DefaultDictionary<int, int>();
d[0]++;
Console.WriteLine(d[0]);
}
}
Csharp
INFO