bson_t (3) Linux Manual Page

NAME

bson_t – BSON Document Abstraction

SYNOPSIS

#include <bson.h>
BSON_ALIGNED_BEGIN(128)
typedef struct
{
    uint32_t flags;       /* Internal flags for the bson_t. */
    uint32_t len;         /* Length of BSON data. */
    uint8_t padding[120]; /* Padding for stack allocation. */
} bson_t
    BSON_ALIGNED_END(128);

DESCRIPTION

The bson_t structure represents a BSON document. This structure manages the underlying BSON encoded buffer. For mutable documents, it can append new data to the document.

PERFORMANCE NOTES

The bson_t structure attepts to use an inline allocation within the structure to speed up performance of small documents. When this internal buffer has been exhausted, a heap allocated buffer will be dynamically allocated. Therefore, it is essential to call bson_destroy(3) on allocated documents.

EXAMPLE

static void
create_on_heap(void)
{
    bson_t *b = bson_new();
    BSON_APPEND_INT32(b, "foo", 123);
    BSON_APPEND_UTF8(b, "bar", "foo");
    BSON_APPEND_DOUBLE(b, "baz", 1.23f);
    bson_destroy(b);
}

COLOPHON

This page is part of libbson. Please report any bugs at https://jira.mongodb.org/browse/CDRIVER.

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