Databases
StackOverflow2013
Postsdbo
POReflection.Emit and generic types
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POReflection.Emit and generic types
    primarykey
    data
    text
    <p>I am using <code>Reflection.Emit</code> and I want to create a type that would be the equivalent of the following type defined in C#:</p> <pre><code>class A { public Tuple&lt;A, int&gt; GetValue(int x) { return new Tuple&lt;A, int&gt;(this, x); } } </code></pre> <p>The trick is that I need to use a generic type from BCL that uses my custom type as a generic argument.</p> <p>I'm messing with the following snippet:</p> <pre><code>var asmName = new AssemblyName("Test"); var access = AssemblyBuilderAccess.Run; var asm = AppDomain.CurrentDomain.DefineDynamicAssembly(asmName, access); var module = asm.DefineDynamicModule("Test"); var aType = module.DefineType("A"); var tupleType = typeof(Tuple&lt;,&gt;).MakeGenericType(aType, typeof(int)); var attrs = MethodAttributes.Public; var method = aType.DefineMethod("GetValue", attrs, tupleType, new [] { typeof(int) }); var gen = method.GetILGenerator(); gen.Emit(OpCodes.Ldarg_0); gen.Emit(OpCodes.Ldarg_1); // here is the fail: var ctor = tupleType.GetConstructor(new [] { typeof(int), aType } ); gen.Emit(OpCodes.Newobj, ctor); </code></pre> <p>The call to <code>GetConstructor</code> fails with the following exception:</p> <blockquote> <p>NotSupportedException: Specified method is not supported.</p> </blockquote> <p>So, basically, it won't let me get the constructor of a type that merely references my custom type, and neither can I finalize the type before emitting the body of its method.</p> <p>Can it really be impossible to get out of this vicious circle?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USImpworks
    1. USImpworks
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POReflection.Emit and generic types
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POReflection.Emit and generic types
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POReflection.Emit and generic types
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat are the exception details?
      singulars
      1. POReflection.Emit and generic types
      1. USPeter Ritchie
    2. COI added the information about the exception to the original question.
      singulars
      1. POReflection.Emit and generic types
      1. USImpworks
    3. COPerhaps you did not read the last comment I left you on your previous question. I'll repeat it for you here: **Reflection.Emit is too weak to use to build a real compiler.** It's great for little toy compilation tasks like emitting dynamic call sites and expression trees in LINQ queries, but for the sorts of problems you'll face in a compiler you will quickly exceed its capabilities. Use CCI, not Reflection.Emit.
      singulars
      1. POReflection.Emit and generic types
      1. USEric Lippert
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload