# bson_writer_get_length()¶

## Synopsis¶

size_t
bson_writer_get_length (bson_writer_t *writer);


## Description¶

Fetches the current length of the content written by the buffer (including the initial offset). This includes a partly written document currently being written.

This is useful if you want to check to see if you’ve passed a given memory boundary that cannot be sent in a packet. See bson_writer_rollback() to abort the current document being written.

## Returns¶

The length of the underlying buffer.