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Can C# Generic Constructors Enforce Specific Parameter Types Beyond Parameterless Constructors?
Can C# Generic Constructors Enforce Specific Parameter Types Beyond Parameterless Constructors?
Jan 14, 2025 pm 03:52 PM
Can C# generic constructor force the parameter type to be specified? Beyond the limitations of parameterless constructors
In C#, constraints can be placed on generic methods to ensure that specific requirements are met. A common constraint is to specify that a generic type must have a parameterless constructor. However, a natural question arises: can we impose more specific constraints on the constructor?
Case: Forced parameter type
Let's take the example provided in the question, where we want to force a constructor that accepts a float[,] parameter. Initial attempt:
public static T Method<T>(T a) where T : new(float[,] u) {
//...do something...
return new T(new float[0, 0]);
}
Compilation failed, forcing us to look for alternatives.
Solution: Create a custom delegate
To circumvent this limitation, we adopted a workaround by introducing a delegate responsible for creating instances of type T. This delegate takes the necessary parameters as parameters and returns an instance of T.
public static void Method<T>(T a, Func<float[,], T> creator) {
//...do something...
}
Modify our code to use this delegate, with the following results:
A.Method(float[,], instanceCreator); Func<float[,], T> instanceCreator = (float[,] arr) => new T(arr);
This solution allows us to impose more complex constraints on the constructor by passing in a suitable delegate.
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