Created
October 21, 2017 05:25
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| using System; | |
| using System.Collections.Generic; | |
| class Program | |
| { | |
| private static readonly Dictionary<int, Func<int, int>> _funcs = new Dictionary<int, Func<int, int>>(); | |
| static void Main(string[] args) | |
| { | |
| for (int iter = 0; iter < 1000000; iter++) | |
| { | |
| for (int i = 1; i < 5; i++) | |
| { | |
| Func<int, int> func = GetFunc(i); | |
| } | |
| } | |
| } | |
| static Func<int, int> GetFunc(int i) | |
| { | |
| if (!_funcs.TryGetValue(i, out var ret)) | |
| { | |
| // This causes no allocations | |
| ret = CreateFunc(i); | |
| // This causes mass allocations | |
| // ret = val => i + 1; | |
| _funcs.Add(i, ret); | |
| } | |
| return ret; | |
| } | |
| static Func<int, int> CreateFunc(int i) | |
| { | |
| return val => i + 1; | |
| } | |
| } |
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