TransformerBase{TInput,TOutput}.cs

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using System;
using System.Linq.Expressions;
 
namespace Tgstation.Server.Host.Models.Transformers
{
    abstract class TransformerBase<TInput, TOutput> : ITransformer<TInput, TOutput>
    {
        static Func<TInput, TOutput>? compiledExpression;
 
        public Expression<Func<TInput, TOutput>> Expression { get; }
 
        public Func<TInput, TOutput> CompiledExpression { get; }
 
        protected TransformerBase(
            Expression<Func<TInput, TOutput>> expression)
        {
            compiledExpression ??= expression.Compile();
            Expression = expression;
            CompiledExpression = compiledExpression;
        }
    }
}