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How I learned to love the struct and stop worrying (part II)...
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| // Use the Test solution configuration and now test cases will fail if they are using '=' on structs. | |
| #if STRUCT_EQ_CHECK | |
| [<AutoOpen>] | |
| #endif | |
| module StructEqCheck = | |
| type StructEqualityException() = | |
| inherit exn() | |
| let inline (=) (a: 'T) (b: 'T) = | |
| let ty = typeof<'T> | |
| if | |
| ty.IsValueType // look for structs | |
| && (not ty.IsPrimitive) // except primitives | |
| && (not ty.IsEnum) // except enums | |
| && ty.IsAssignableTo(typeof<IEquatable<'T>>) // must be IEquatable<'T> otherwise fast track not possible | |
| then | |
| raise (new StructEqualityException()) | |
| // TODO also check types with nested structs | |
| a = b |
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| <Project Sdk="Microsoft.NET.Sdk"> | |
| <PropertyGroup> | |
| <TargetFramework>net6.0</TargetFramework> | |
| <AssemblyName>Foo</AssemblyName> | |
| <Configurations>Debug;Release;Test</Configurations> | |
| </PropertyGroup> | |
| <PropertyGroup Condition="'$(Configuration)'=='Test'"> | |
| <DefineConstants>STRUCT_EQ_CHECK</DefineConstants> | |
| </PropertyGroup> | |
| </Project> |
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