✨Add Implicit From Attribute.

Author: Ted-Jin-Lab

Tests/TedToolkit.Console/Absorptance.cs

@@ -1,5 +1,6 @@
 namespace TedToolkit.Quantities;
 
+[QuantityImplicitFromValueType]
 [QuantityImplicitToValueType]
 [QuantityOperator<AbsorbedDose, AbsorbedDose, double>(Operator.Divide)]
 partial struct AbsorbedDose
@@ -10,5 +11,6 @@ public static void Test()
         var b = new AbsorbedDose(10, AbsorbedDoseUnit.Centigray);
         var c = a / b;
         double d = a;
+        AbsorbedDose e = 10.0;
     }
 }

src/analyzers/TedToolkit.Quantities.Analyzer/QuantityStructGenerator.cs

@@ -442,7 +442,7 @@ public void GenerateCode(SourceProductionContext context)
                         #region Conversions
 
                         ConversionOperatorDeclaration(
-                                Token(quantitySymbol?.GetAttributes().Any(a => a.AttributeClass?.GetName().FullName 
+                                Token(quantitySymbol?.GetAttributes().Any(a => a.AttributeClass?.GetName().FullName
                                     is "global::TedToolkit.Quantities.QuantityImplicitToValueTypeAttribute") ?? false
                                     ? SyntaxKind.ImplicitKeyword
                                     : SyntaxKind.ExplicitKeyword),
@@ -461,7 +461,11 @@ public void GenerateCode(SourceProductionContext context)
                                 IdentifierName("Value"))))
                             .WithSemicolonToken(Token(SyntaxKind.SemicolonToken)),
 
-                        ConversionOperatorDeclaration(Token(SyntaxKind.ExplicitKeyword),
+                        ConversionOperatorDeclaration(
+                                Token(quantitySymbol?.GetAttributes().Any(a => a.AttributeClass?.GetName().FullName 
+                                    is "global::TedToolkit.Quantities.QuantityImplicitFromValueTypeAttribute") ?? false
+                                    ? SyntaxKind.ImplicitKeyword
+                                    : SyntaxKind.ExplicitKeyword),
                                 IdentifierName(quantity.Name))
                             .WithModifiers(
                                 TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.StaticKeyword)))

src/libraries/TedToolkit.Quantities/QuantityImplicitFromValueTypeAttribute.cs

@@ -0,0 +1,7 @@
+namespace TedToolkit.Quantities;
+
+/// <summary>
+/// Implicit convert from the value type
+/// </summary>
+[AttributeUsage(AttributeTargets.Struct)]
+public sealed class QuantityImplicitFromValueTypeAttribute: Attribute;

src/libraries/TedToolkit.Quantities/QuantityImplicitToValueTypeAttribute.cs

@@ -1,6 +1,7 @@
-using System.Diagnostics.CodeAnalysis;
+namespace TedToolkit.Quantities;
 
-namespace TedToolkit.Quantities;
+/// <summary>
+/// Implicit convert to the value type
+/// </summary>
 [AttributeUsage(AttributeTargets.Struct)]
-[SuppressMessage("ReSharper", "UnusedTypeParameter")]
-public sealed class QuantityImplicitToValueTypeAttribute: Attribute;
+public sealed class QuantityImplicitToValueTypeAttribute : Attribute;