rspec/rules/S2220/rule.adoc

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== Why is this an issue?
Failing to null-test the argument to an ``++equals++`` method could result in a null pointer dereference, leading to runtime failures.
=== Noncompliant code example
[source,text]
----
public bool Equals (object obj) { // Noncompliant
return getValue() == obj.getValue() ;
}
----
=== Compliant solution
[source,text]
----
public bool Equals (object obj) {
if (obj == null) {
return false;
}
return getValue() == obj.getValue() ;
}
----
== Resources
* https://cwe.mitre.org/data/definitions/476[MITRE, CWE-476] - NULL Pointer Dereference