[#util-LineReader-ReadLength]
= xref:util.adoc[util]::xref:util/LineReader.adoc[LineReader]::ReadLength
:relfileprefix: ../../
:mrdocs:

Returns string from current iterator position of specified length if possible and advances iterator on success. May exceed max_line_length but will not read past end of buffer.

== Synopsis

Declared in `<util/string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::string_view
ReadLength(size_t len);
----

== Exceptions

[cols="1,4"]
|===
| Name| Thrown on
| `std::runtime_error`
| if there is not enough data in the buffer.
|===

== Return Value

a string of the expected length.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *len* [in]
| The number of bytes to read from the buffer
|===


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