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javac++genericsjava-native-interface
Victor
Victor

Reputation: 8490

Generic JNI Type instantiation

How can I instanciate a generic type in c++?

If I want to create a List<X> where X is object. How can I do that?

Upvotes: 3

Views: 540

Answers (2)

user207421
user207421

Reputation: 310980

Just instantiate List. As Generics are erased by the compiler, this is fully equivalent to List at runtime.

Upvotes: 4

Peter Lawrey
Peter Lawrey

Reputation: 533680

Given you cannot instantiate a generic type at runtime in Java, I am pretty sure you can't do it in C++.

Generics are a compile time feature. Unless you want to pass what you produce to a compiler e.g. as plain Java code in text, generics are unlikely to be useful to you. (And if you did want to do this I suspect C++ wouldn't be your best choice)

If I want to create a List where X is object

In Java X is a type of reference to an object. As the code from all Lists only hold references, the code is the same and is not templated like in C++. This means you can't use a primitives or structs or objects, only references.

Upvotes: 1

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