error: ‘nullptr’ was not declared in this scope

Question

I'm trying to compile a project on my university's ssh server and I get the error:

Node.h:12: error: ‘nullptr’ was not declared in this scope

Chunk of code from my Node.h class:

template <typename T> 

struct Node{
    T data; 
    Node *leftChild; 
    Node *rightChild; 

    Node(const T & theData = nullptr, Node *left = nullptr, Node *right = nullptr);
    Node(T && theElement = nullptr, Node *left = nullptr, Node *right = nullptr);

    T getData(); 
};

The server runs on GCC version 4.4.7 and I'm compiling using the following command:

g++ -std=c++0x

^ I use this command for all of my projects for this class, and this is the first time I'm running into this issue. What can I try to resolve this?

I know, I don't know why my school hasn't updated it in so long :( — hmp54
– hmp54, Commented Feb 12, 2020 at 19:18
nullptr came into being in C++11, see en.cppreference.com/w/cpp/language/nullptr — catnip
– catnip, Commented Feb 12, 2020 at 19:18
@hmp54 It seems your compiler does not support the literal nullptr. Instead use NULL. — Vlad from Moscow
– Vlad from Moscow, Commented Feb 12, 2020 at 19:19
With const T & theData = nullptr, your elements can only be pointers (or nullptr_t). I doubt that it's what you want – you probably want const T & theData = T() — molbdnilo
– molbdnilo, Commented Feb 12, 2020 at 19:35

Aroic · Accepted Answer · 2020-02-12 19:19:37Z

3

According to https://gcc.gnu.org/projects/cxx-status.html#cxx11, the null pointer constant is a part of GCC 4.6+. You'll have to find a way around using the nullptr constant or update the GCC version(recommended).

answered Feb 12, 2020 at 19:19

Aroic

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2 Comments

hmp54 Over a year ago

I can't update the GCC version since I'm working with my university's server. What's an alternative to nullptr and null? Both of them cause the same error.

Aroic Over a year ago

@hmp54 did you try null or NULL? You could also just try = 0 as that (I believe) is the underlying logic of NULL. See here: cplusplus.com/reference/cstring/NULL

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