[#CDiskTxPos]
= CDiskTxPos
:mrdocs:

On‐disk position of a transaction: a block file position plus an offset within the block.

== Synopsis

Declared in `<index/disktxpos.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct CDiskTxPos
    : xref:FlatFilePos.adoc[FlatFilePos]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:FlatFilePos.adoc[FlatFilePos]`
| Location of a record within a numbered flat file: a file index and byte offset.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:CDiskTxPos/2constructor-00.adoc[`CDiskTxPos`]         [.small]#[constructor]#
| Constructors
| xref:FlatFilePos/IsNull.adoc[`IsNull`] 
| Returns true when the position is null (no file assigned).
| xref:FlatFilePos/ToString.adoc[`ToString`] 
| Returns a human‐readable "file:offset" description of the position.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:CDiskTxPos/Ser-0f.adoc[`Ser`] 
| Serializes the file index and byte offset.
| xref:CDiskTxPos/Unser-01.adoc[`Unser`] 
| Serializes the file index and byte offset.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:FlatFilePos/nFile.adoc[`nFile`] 
| Index of the flat file, or ‐1 when null.
| xref:FlatFilePos/nPos.adoc[`nPos`] 
| Byte offset of the record within the file.
| xref:CDiskTxPos/nTxOffset.adoc[`nTxOffset`] 
| Byte offset of the transaction within the block, measured after the block header.
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:operator_eq-0c6.adoc[`operator==`]
| Compares two positions for equality of file index and offset.
|===


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