classutil 1.0.0

Class/interface type checking utility for D

To use this package, run the following command in your project's root directory:

Manual usage
Put the following dependency into your project's dependences section:


Class/interface type checking utility for D.


It can check interface types of any class instance that has TypeInfo (unfortunately, you'll have to use other means for C++ classes) to avoid unsafe typecasting, and to direct code to do other things.

public void someFunction(Object o) {
    if (isInterface!InterfaceOne(o)) {
        InterfaceOne foo = cast(InterfaceOne)o;
    } else if (isInterface!InterfaceTwo(o)) {
        InterfaceTwo foo = cast(InterfaceOne)o;

Same with classes:

public void someFunction(Object o) {
    if (isClass!SomeClass(o)) {
        SomeClass foo = cast(SomeClass)o;

Other alternatives include:

  • The typeid expression, but this only works during compile time.
  • Giving the class a function to check its type, but this becomes hard to maintain in bigger projects, and might not be universal.
  • Manually checking the classinfo of each instance.

Potential applications

  • Scripting languages binding to D class member functions in one way or another.
  • Having to differentiate the multiple children of the same class type.
  • Casting types safely in general.
  • laszl
1.0.0 2022-Dec-20
~main 2022-Dec-20
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