This compares 4 different types of setter - first argument of a setter is always object on which property is declared. We're comparing different combinations on perf difference depending if declaring type is generic type or object. For the last (Func) case we return the object since structs will always operate on the copy which means you wouldn't be able to modify them otherwise.
- Times in milliseconds.
- Iterations per testcase: 500000000
Actionish<ref TDeclaringType, TPropertyType>- is actually a delegate equivalent to such action since you cannot actually use such typeAction<object, object>is a baseline for difference for other cases i.e.[-8.7%]meaning total runtime of equivalent test case was 8.7% shorter or in simpler words the more negative value the faster it is.- for first two cases modifying struct property has to happen using
Unsafe.Unboxsince simply casting to a struct would operate on its copy
| TestCase | Action<object, object> |
Action<object, TPropertyType> |
Actionish<ref TDeclaringType, TPropertyType> |
Func<TDeclaringType, TPropertyType, TDeclaringType> |
|---|---|---|---|---|
| TestClass.IntProperty | 1862 | 1700 [-8.7%] | 1346 [-27.71%] | 1353 [-27.34%] |
| TestClass.IntField | 1927 | 1636 [-15.1%] | 1281 [-33.52%] | 1286 [-33.26%] |
| TestClass.StringProperty | 2242 | 2124 [-5.26%] | 1780 [-20.61%] | 1788 [-20.25%] |
| TestClass.StringField | 2179 | 2213 [+1.56%] | 1745 [-19.92%] | 1876 [-13.91%] |
| TestClass.StructProperty | 2640 | 2468 [-6.52%] | 2458 [-6.89%] | 2354 [-10.83%] |
| TestClass.StructField | 2828 | 2917 [+3.15%] | 2689 [-4.92%] | 2852 [+0.85%] |
| TestClass.ClassProperty | 2397 | 2110 [-11.97%] | 1877 [-21.69%] | 1780 [-25.74%] |
| TestClass.ClassField | 2297 | 2104 [-8.4%] | 1743 [-24.12%] | 1755 [-23.6%] |
| TestStruct.IntProperty | 1860 | 1587 [-14.68%] | 1406 [-24.41%] | 9108 [+389.68%] |
| TestStruct.IntField | 1803 | 1523 [-15.53%] | 1279 [-29.06%] | 9346 [+418.36%] |
| TestStruct.StringProperty | 2639 | 2139 [-18.95%] | 1666 [-36.87%] | 10022 [+279.77%] |
| TestStruct.StringField | 2536 | 2224 [-12.3%] | 1622 [-36.04%] | 10014 [+294.87%] |
| TestStruct.StructProperty | 2752 | 2689 [-2.29%] | 1895 [-31.14%] | 9910 [+260.1%] |
| TestStruct.StructField | 3016 | 2905 [-3.68%] | 2196 [-27.19%] | 10409 [+245.13%] |
| TestStruct.ClassProperty | 2587 | 2136 [-17.43%] | 1657 [-35.95%] | 10094 [+290.18%] |
| TestStruct.ClassField | 2654 | 2208 [-16.8%] | 1622 [-38.88%] | 10055 [+278.86%] |