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Benchmark the relative costs of structs vs primitive types
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
namespace ConsoleApp
{
class Program
{
static void Main(string[] args)
{
BenchmarkRunner.Run<Driver>();
}
}
[MemoryDiagnoser]
public class Driver
{
private int Foo(string s)
{
return s.GetHashCode();
}
private int Foo(WrapString s)
{
return s.Value.GetHashCode();
}
private int Foo(Wrap<string> s)
{
return s.Value.GetHashCode();
}
private readonly string _sample = "sample";
[Benchmark]
public void Primitive()
{
var v = _sample;
Foo(v);
}
[Benchmark]
public void UsingStruct()
{
var v = new WrapString(_sample);
Foo(v);
}
[Benchmark]
public void UsingGenericStruct()
{
var v = new Wrap<string>(_sample);
Foo(v);
}
}
public readonly struct WrapString
{
public readonly string Value;
public WrapString(string value)
{
Value = value;
}
}
public readonly struct Wrap<T>
{
public readonly T Value;
public Wrap(T value)
{
Value = value;
}
}
}
/*
Results:
Method | Mean | Error | StdDev | Median | Allocated |
------------------- |---------:|----------:|----------:|---------:|----------:|
Primitive | 6.163 ns | 0.1576 ns | 0.2104 ns | 6.111 ns | 0 B |
UsingStruct | 6.124 ns | 0.1970 ns | 0.5394 ns | 5.841 ns | 0 B |
UsingGenericStruct | 5.886 ns | 0.0984 ns | 0.0921 ns | 5.894 ns | 0 B |
Conclusion: No meaningful difference between the techniques
*/
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