using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Columns;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Environments;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Reports;

[Config(typeof(Config))]
[HideColumns(Column.Job, Column.RatioSD, Column.AllocRatio)]
[MemoryDiagnoser]
[ReturnValueValidator(failOnError: true)]
public class CollectionExpressions
{
    [Benchmark(Baseline = true)]
    public List<string> RegularList()
    {
        return new List<string> { "apple", "banana", "orange" };
    }

    [Benchmark]
    public List<string> ColExpressionList()
    {
        return ["apple", "banana", "orange"];
    }

    private class Config : ManualConfig
    {
        public Config()
        {
            AddJob(Job.Default.WithId(".NET 8").WithRuntime(CoreRuntime.Core80));

            SummaryStyle =
                SummaryStyle.Default.WithRatioStyle(RatioStyle.Trend);
        }
    }
}

// .NET 8
public List<string> RegularList()
{
    List<string> list = new List<string>();
    list.Add("apple");
    list.Add("banana");
    list.Add("orange");
    return list;
}

// .NET 8
public List<string> ColExpressionList()
{
    List<string> list = new List<string>();
    CollectionsMarshal.SetCount(list, 3);
    Span<string> span = CollectionsMarshal.AsSpan(list);
    int num = 0;
    span[num] = "apple";
    num++;
    span[num] = "banana";
    num++;
    span[num] = "orange";
    num++;
    return list;
}

// .NET 8
.method public hidebysig 
    instance class [System.Collections]System.Collections.Generic.List`1<string> RegularList () cil managed 
{
    .custom instance void [System.Runtime]System.Runtime.CompilerServices.NullableContextAttribute::.ctor(uint8) = (
        01 00 01 00 00
    )
    .custom instance void [BenchmarkDotNet.Annotations]BenchmarkDotNet.Attributes.BenchmarkAttribute::.ctor(int32, string) = (
        01 00 19 00 00 00 01 5f 01 00 54 02 08 42 61 73
        65 6c 69 6e 65 01
    )
    // Method begins at RVA 0x2050
    // Code size 39 (0x27)
    .maxstack 8

    // sequence point: (line 28, col 9) to (line 28, col 65) in _
    IL_0000: newobj instance void class [System.Collections]System.Collections.Generic.List`1<string>::.ctor()
    IL_0005: dup
    IL_0006: ldstr "apple"
    IL_000b: callvirt instance void class [System.Collections]System.Collections.Generic.List`1<string>::Add(!0)
    IL_0010: dup
    IL_0011: ldstr "banana"
    IL_0016: callvirt instance void class [System.Collections]System.Collections.Generic.List`1<string>::Add(!0)
    IL_001b: dup
    IL_001c: ldstr "orange"
    IL_0021: callvirt instance void class [System.Collections]System.Collections.Generic.List`1<string>::Add(!0)
    IL_0026: ret
}

// .NET 8
.method public hidebysig 
    instance class [System.Collections]System.Collections.Generic.List`1<string> ColExpressionList () cil managed 
{
    .custom instance void [System.Runtime]System.Runtime.CompilerServices.NullableContextAttribute::.ctor(uint8) = (
        01 00 01 00 00
    )
    .custom instance void [BenchmarkDotNet.Annotations]BenchmarkDotNet.Attributes.BenchmarkAttribute::.ctor(int32, string) = (
        01 00 1f 00 00 00 01 5f 00 00
    )
    // Method begins at RVA 0x2078
    // Code size 76 (0x4c)
    .maxstack 3
    .locals init (
        [0] valuetype [System.Runtime]System.Span`1<string>,
        [1] int32
    )

    // sequence point: (line 34, col 9) to (line 34, col 46) in _
    IL_0000: newobj instance void class [System.Collections]System.Collections.Generic.List`1<string>::.ctor()
    IL_0005: dup
    IL_0006: ldc.i4.3
    IL_0007: call void [System.Runtime.InteropServices]System.Runtime.InteropServices.CollectionsMarshal::SetCount<string>(class [System.Collections]System.Collections.Generic.List`1<!!0>, int32)
    IL_000c: dup
    IL_000d: call valuetype [System.Runtime]System.Span`1<!!0> [System.Runtime.InteropServices]System.Runtime.InteropServices.CollectionsMarshal::AsSpan<string>(class [System.Collections]System.Collections.Generic.List`1<!!0>)
    IL_0012: stloc.0
    IL_0013: ldc.i4.0
    IL_0014: stloc.1
    IL_0015: ldloca.s 0
    IL_0017: ldloc.1
    IL_0018: call instance !0& valuetype [System.Runtime]System.Span`1<string>::get_Item(int32)
    IL_001d: ldstr "apple"
    IL_0022: stind.ref
    IL_0023: ldloc.1
    IL_0024: ldc.i4.1
    IL_0025: add
    IL_0026: stloc.1
    IL_0027: ldloca.s 0
    IL_0029: ldloc.1
    IL_002a: call instance !0& valuetype [System.Runtime]System.Span`1<string>::get_Item(int32)
    IL_002f: ldstr "banana"
    IL_0034: stind.ref
    IL_0035: ldloc.1
    IL_0036: ldc.i4.1
    IL_0037: add
    IL_0038: stloc.1
    IL_0039: ldloca.s 0
    IL_003b: ldloc.1
    IL_003c: call instance !0& valuetype [System.Runtime]System.Span`1<string>::get_Item(int32)
    IL_0041: ldstr "orange"
    IL_0046: stind.ref
    IL_0047: ldloc.1
    IL_0048: ldc.i4.1
    IL_0049: add
    IL_004a: stloc.1
    IL_004b: ret
}