[#CBlockIndex-IsValid]
= xref:CBlockIndex.adoc[CBlockIndex]::IsValid
:relfileprefix: ../
:mrdocs:

Check whether this block index entry is valid up to the passed validity level.

== Synopsis

Declared in `<chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7f9500cbe3d8), requires_capability(0x7f9511905a18), requires_capability(0x7f951ec49c98), requires_capability(0x7f9524d79d98), requires_capability(0x7f9503ca0668), requires_capability(0x7f9516ce9d38), requires_capability(0x7f9520d77ff8), requires_capability(0x7f9524d44898), requires_capability(0x7f9517141c68), requires_capability(0x7f9516bbe708), requires_capability(0x7f94f38595b8)]]
bool
IsValid(xref:BlockStatus.adoc[BlockStatus] nUpTo) const;
----

== Return Value

True if the entry has reached at least the given validity level and has not failed.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *nUpTo*
| The validity level to check against.
|===


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