[#CBlockIndex-2constructor-0c]
= xref:CBlockIndex.adoc[CBlockIndex]::CBlockIndex
:relfileprefix: ../
:mrdocs:

CBlockIndex should not allow public copy construction because equality comparison via pointer is very common throughout the codebase, making use of copy a footgun. Also, use of copies do not have the benefit of simplifying lifetime considerations due to attributes like pprev and pskip, which are at risk of becoming dangling pointers in a copied instance.

== Synopsis

Declared in `<chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
CBlockIndex(xref:CBlockIndex.adoc[CBlockIndex] const& other) = default;
----

== Description

We declare these protected instead of simply deleting them so that CDiskBlockIndex can reuse copy construction.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *other*
| The entry to copy from.
|===


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