iiweis / PrimitiveStaticDataGenerator

C# Source Generator for creating methods that return optimized ReadOnlySpan<T> static data from primitive values.

PrimitiveStaticDataGenerator

Usage

user code:

using System;
using PrimitiveStaticDataGenerator;

namespace MyCode
{
    public partial class UserClass
    {
        [return: PrimitiveStaticData(1, 2, 3, 4, 5)]
        public static partial ReadOnlySpan<int> Int();
        
        [return: PrimitiveStaticData('A', 'B', 'C')]
        public static partial ReadOnlySpan<char> Char();
    }
}

generated code:

using System;
using PrimitiveStaticDataGenerator;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

namespace MyCode
{
    public partial class UserClass
    {
        public static partial ReadOnlySpan<int> Int()
        {
            ReadOnlySpan<byte> span;
            if (BitConverter.IsLittleEndian)
            {
                span = new byte[] { 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0 };
            }
            else
            {
                span = new byte[] { 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0, 5 };
            }

            return MemoryMarshal.CreateReadOnlySpan(ref Unsafe.As<byte, int>(ref MemoryMarshal.GetReference(span)), 5);
        }
        
        public static partial ReadOnlySpan<char> Char()
        {
            ReadOnlySpan<byte> span;
            if (BitConverter.IsLittleEndian)
            {
                span = new byte[] { 65, 0, 66, 0, 67, 0 };
            }
            else
            {
                span = new byte[] { 0, 65, 0, 66, 0, 67 };
            }
    
            return MemoryMarshal.CreateReadOnlySpan(ref Unsafe.As<byte, char>(ref MemoryMarshal.GetReference(span)), 3);
        }
    }
}

Supported Types

• bool
• char
• sbyte
• byte
• short
• ushort
• int
• uint
• long
• ulong
• float
• double
• string