Example of low overhead assertion method

LowOverheadAssertExample.cs

#if UNITY_5_3_OR_NEWER
#define UNITY
#else
#define NON_UNITY
#endif

// Determine whether to strip assertions.
#if !(UNITY && UNITY_ASSERTIONS) && !(NON_UNITY && DEBUG)
#define STRIP_ASSERTION_METHODS
#endif

using System;
using System.Diagnostics;
using JetBrains.Annotations;

public static class MyAssert
{
#if STRIP_ASSERTION_METHODS
    [Conditional("NEVER_DEFINED")]
#endif
    [DebuggerStepThrough]
    [AssertionMethod]
    [ContractAnnotation("halt <= condition: false")]
    public static void IsTrue<T>(bool condition, T context, [NotNull] Func<T, string> onFailed)
    {
#if !STRIP_ASSERTION_METHODS
        if (!condition)
        {
            throw new Exception(onFailed(context) ?? "");
        }
#endif
    }
}

namespace ConsoleApp1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            // Pass
            Test(0, 1);

            // Fail
            Test(1, 0);
        }

        private static void Test(int a, int b)
        {
            // No GC occurs after the first time.
            MyAssert.IsTrue(a < b, (a, b), args => $"a = {args.a}, b = {args.b}");
        }
    }
}