Remove default constructors on structs for .NET Standard 2.0

Directory.Packages.props

@@ -31,6 +31,7 @@
     <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="System.IO.Compression" Version="4.3.0" />
     <PackageVersion Include="System.Memory" Version="4.5.5" />
+    <PackageVersion Include="TngTech.ArchUnitNET.xUnit" Version="0.10.6" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.2.0" />
     <PackageVersion Include="Verify.Xunit" Version="24.2.0" />
     <PackageVersion Include="xunit" Version="2.8.1" />

SpreadCheetah.Test/Helpers/NoDefaultConstructorForStructsCondition.cs

@@ -0,0 +1,42 @@
+using ArchUnitNET.Domain;
+using ArchUnitNET.Domain.Extensions;
+using ArchUnitNET.Fluent.Conditions;
+
+namespace SpreadCheetah.Test.Helpers;
+
+internal sealed class NoDefaultConstructorForStructsCondition : ICondition<IType>
+{
+    public string Description => "not have a default constructor";
+
+    public IEnumerable<ConditionResult> Check(IEnumerable<IType> objects, Architecture architecture)
+    {
+        foreach (var obj in objects)
+        {
+            yield return Check(obj);
+        }
+    }
+
+    private static ConditionResult Check(IType type)
+    {
+        var pass = true;
+
+        if (type is Struct structType)
+        {
+            foreach (var constructor in structType.GetConstructors())
+            {
+                if (constructor.IsStatic is true)
+                    continue;
+
+                if (!constructor.Parameters.Any())
+                {
+                    pass = false;
+                    break;
+                }
+            }
+        }
+
+        return new ConditionResult(type, pass: pass, failDescription: pass ? null : "has a default constructor");
+    }
+
+    public bool CheckEmpty() => true;
+}

SpreadCheetah.Test/SpreadCheetah.Test.csproj

@@ -24,6 +24,7 @@
     <PackageReference Include="EPPlusFree" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="PublicApiGenerator" />
+    <PackageReference Include="TngTech.ArchUnitNET.xUnit" />
     <PackageReference Include="Verify.Xunit" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio">
@@ -50,7 +51,6 @@
 
   <ItemGroup>
     <ProjectReference Include="..\SpreadCheetah.TestHelpers\SpreadCheetah.TestHelpers.csproj" />
-    <ProjectReference Include="..\SpreadCheetah\SpreadCheetah.csproj" />
   </ItemGroup>
 
 </Project>

SpreadCheetah.Test/Tests/ArchitectureTests.cs

@@ -0,0 +1,27 @@
+#if !NET5_0_OR_GREATER
+using ArchUnitNET.Domain;
+using ArchUnitNET.Loader;
+using ArchUnitNET.xUnit;
+using SpreadCheetah.Test.Helpers;
+using static ArchUnitNET.Fluent.ArchRuleDefinition;
+
+namespace SpreadCheetah.Test.Tests;
+
+public class ArchitectureTests
+{
+    private static readonly Architecture Architecture = new ArchLoader().LoadAssemblies(typeof(Spreadsheet).Assembly).Build();
+
+    /// <summary>
+    /// Structs with a default constructor leads to a compilation error on UWP: https://github.com/sveinungf/spreadcheetah/issues/58
+    /// </summary>
+    [Fact]
+    public void Architecture_NoDefaultConstructorForStructs()
+    {
+        // Arrange
+        var rule = Types().Should().FollowCustomCondition(new NoDefaultConstructorForStructsCondition());
+
+        // Act & Assert
+        rule.Check(Architecture);
+    }
+}
+#endif

SpreadCheetah/CellValues/CellValue.cs

@@ -8,12 +8,12 @@ internal readonly struct CellValue
     [FieldOffset(0)] public readonly StringOrPrimitiveCellValue StringOrPrimitive;
     [FieldOffset(0)] public readonly ReadOnlyMemory<char> Memory;
 
+#if NET5_0_OR_GREATER
     public CellValue()
     {
-#if NET5_0_OR_GREATER
         System.Runtime.CompilerServices.Unsafe.SkipInit(out this);
-#endif
     }
+#endif
 
     public CellValue(StringOrPrimitiveCellValue value) : this() => StringOrPrimitive = value;
     public CellValue(ReadOnlyMemory<char> value) : this() => Memory = value;

SpreadCheetah/CellValues/PrimitiveCellValue.cs

@@ -9,12 +9,12 @@ internal readonly struct PrimitiveCellValue
     [FieldOffset(0)] public readonly float FloatValue;
     [FieldOffset(0)] public readonly double DoubleValue;
 
+#if NET5_0_OR_GREATER
     public PrimitiveCellValue()
     {
-#if NET5_0_OR_GREATER
         System.Runtime.CompilerServices.Unsafe.SkipInit(out this);
-#endif
     }
+#endif
 
     public PrimitiveCellValue(int value) : this() => IntValue = value;
     public PrimitiveCellValue(float value) : this() => FloatValue = value;

SpreadCheetah/CellValues/StringOrPrimitiveCellValue.cs

@@ -5,12 +5,12 @@ internal readonly struct StringOrPrimitiveCellValue
     public readonly string? StringValue;
     public readonly PrimitiveCellValue PrimitiveValue;
 
+#if NET5_0_OR_GREATER
     public StringOrPrimitiveCellValue()
     {
-#if NET5_0_OR_GREATER
         System.Runtime.CompilerServices.Unsafe.SkipInit(out this);
-#endif
     }
+#endif
 
     public StringOrPrimitiveCellValue(string? value) : this() => StringValue = value;
     public StringOrPrimitiveCellValue(PrimitiveCellValue value) : this() => PrimitiveValue = value;

SpreadCheetah/Helpers/PooledArray.cs

@@ -9,12 +9,6 @@
 
     public ReadOnlyMemory<T> Memory => _array.AsMemory(0, _count);
 
-    public PooledArray()
-    {
-        _array = [];
-        _count = 0;
-    }
-
     private PooledArray(T[] array, int count)
     {
         _array = array;
@@ -24,7 +18,7 @@
     public static PooledArray<T> Create(ICollection<T> collection)
     {
         if (collection.Count == 0)
-            return new PooledArray<T>();
+            return new PooledArray<T>([], 0);
 
         var array = ArrayPool<T>.Shared.Rent(collection.Count);