c++ initializing array of objects

Question

I need to split string to an array. And I get object reference not set to an instance of an object when I try to add new object to the array:

array<d3^> ^pr_d3; //d3 - class
parts = sr->ReadLine()->Split(
    (array<String^>^)nullptr, 
    StringSplitOptions::RemoveEmptyEntries); //array<String ^> ^parts;

pr_d3[0] = gcnew d3(
     parts[0], parts[1], 
     parts[2],
     Convert::ToInt16(parts[3]), Convert::ToInt16(parts[4])); //error

Code on Ideon

@tobi303 The tag C++ was wrong as this is actually C++/CLI (en.wikipedia.org/wiki/C%2B%2B/CLI) — Simon Kraemer
– Simon Kraemer, Commented Feb 17, 2016 at 10:18
What is criteria of Split? Can u provide normal source code on ideone.com? — Boris Ivanov
– Boris Ivanov, Commented Feb 17, 2016 at 10:19

David Yaw · Accepted Answer · 2016-02-17 15:13:16Z

1

You're not initializing the array pr_d3.

Removing the correct code, you currently have this:

array<d3^> ^pr_d3;
pr_d3[0] = gcnew d3(...);

The error is trying to access [0] of pr_d3, but pr_d3 is still null.

You need to initialize pr_d3 with gcnew array<d3^>(<some array size>), or if you're not sure of the size you'll need, use a List<d3^> instead.

answered Feb 17, 2016 at 15:13

David Yaw

28.1k5 gold badges65 silver badges95 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

c++ initializing array of objects

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related