protozero 1.7.1 Minimalistic protocol buffer decoder and encoder in C++.

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Public Types | Public Member Functions | List of all members
protozero::pbf_reader Class Reference

`#include <pbf_reader.hpp>`

Inheritance diagram for protozero::pbf_reader:
[legend]

## Public Types
using | const_bool_iterator = const_varint_iterator< int32_t >
| Forward iterator for iterating over bool (int32 varint) values.
using | const_enum_iterator = const_varint_iterator< int32_t >
| Forward iterator for iterating over enum (int32 varint) values.
using | const_int32_iterator = const_varint_iterator< int32_t >
| Forward iterator for iterating over int32 (varint) values.
using | const_sint32_iterator = const_svarint_iterator< int32_t >
| Forward iterator for iterating over sint32 (varint) values.
using | const_uint32_iterator = const_varint_iterator< uint32_t >
| Forward iterator for iterating over uint32 (varint) values.
using | const_int64_iterator = const_varint_iterator< int64_t >
| Forward iterator for iterating over int64 (varint) values.
using | const_sint64_iterator = const_svarint_iterator< int64_t >
| Forward iterator for iterating over sint64 (varint) values.
using | const_uint64_iterator = const_varint_iterator< uint64_t >
| Forward iterator for iterating over uint64 (varint) values.
using | const_fixed32_iterator = const_fixed_iterator< uint32_t >
| Forward iterator for iterating over fixed32 values.
using | const_sfixed32_iterator = const_fixed_iterator< int32_t >
| Forward iterator for iterating over sfixed32 values.
using | const_fixed64_iterator = const_fixed_iterator< uint64_t >
| Forward iterator for iterating over fixed64 values.
using | const_sfixed64_iterator = const_fixed_iterator< int64_t >
| Forward iterator for iterating over sfixed64 values.
using | const_float_iterator = const_fixed_iterator< float >
| Forward iterator for iterating over float values.
using | const_double_iterator = const_fixed_iterator< double >
| Forward iterator for iterating over double values.

## Public Member Functions
| pbf_reader (const data_view &view) noexcept
| pbf_reader (const char *data, std::size_t size) noexcept
| pbf_reader (const std::pair< const char *, std::size_t > &data) noexcept
| pbf_reader (const std::string &data) noexcept
| pbf_reader () noexcept=default
| pbf_reader (const pbf_reader &) noexcept=default
| pbf_reader messages can be copied trivially.
| pbf_reader (pbf_reader &&) noexcept=default
| pbf_reader messages can be moved trivially.
pbf_reader & | operator= (const pbf_reader &other) noexcept=default
| pbf_reader messages can be copied trivially.
pbf_reader & | operator= (pbf_reader &&other) noexcept=default
| pbf_reader messages can be moved trivially.
void | swap (pbf_reader &other) noexcept
| operator bool () const noexcept
data_view | data () const noexcept
std::size_t | length () const noexcept
bool | next ()
bool | next (pbf_tag_type next_tag)
bool | next (pbf_tag_type next_tag, pbf_wire_type type)
pbf_tag_type | tag () const noexcept
pbf_wire_type | wire_type () const noexcept
uint32_t | tag_and_type () const noexcept
bool | has_wire_type (pbf_wire_type type) const noexcept
void | skip ()
Scalar field accessor functions
bool | get_bool ()
int32_t | get_enum ()
int32_t | get_int32 ()
int32_t | get_sint32 ()
uint32_t | get_uint32 ()
int64_t | get_int64 ()
int64_t | get_sint64 ()
uint64_t | get_uint64 ()
uint32_t | get_fixed32 ()
int32_t | get_sfixed32 ()
uint64_t | get_fixed64 ()
int64_t | get_sfixed64 ()
float | get_float ()
double | get_double ()
data_view | get_view ()
std::pair< const char *, pbf_length_type > | get_data ()
std::string | get_bytes ()
std::string | get_string ()
pbf_reader | get_message ()
Repeated packed field accessor functions
iterator_range< pbf_reader::const_bool_iterator > | get_packed_bool ()
iterator_range< pbf_reader::const_enum_iterator > | get_packed_enum ()
iterator_range< pbf_reader::const_int32_iterator > | get_packed_int32 ()
iterator_range< pbf_reader::const_sint32_iterator > | get_packed_sint32 ()
iterator_range< pbf_reader::const_uint32_iterator > | get_packed_uint32 ()
iterator_range< pbf_reader::const_int64_iterator > | get_packed_int64 ()
iterator_range< pbf_reader::const_sint64_iterator > | get_packed_sint64 ()
iterator_range< pbf_reader::const_uint64_iterator > | get_packed_uint64 ()
iterator_range< pbf_reader::const_fixed32_iterator > | get_packed_fixed32 ()
iterator_range< pbf_reader::const_sfixed32_iterator > | get_packed_sfixed32 ()
iterator_range< pbf_reader::const_fixed64_iterator > | get_packed_fixed64 ()
iterator_range< pbf_reader::const_sfixed64_iterator > | get_packed_sfixed64 ()
iterator_range< pbf_reader::const_float_iterator > | get_packed_float ()
iterator_range< pbf_reader::const_double_iterator > | get_packed_double ()

## Detailed Description

This class represents a protobuf message. Either a top-level message or a nested sub-message. Top-level messages can be created from any buffer with a pointer and length:

std::string buffer;
// fill buffer...
pbf_reader message{buffer.data(), buffer.size()};
protozero::data_view::size
constexpr std::size_t size() const noexcept
Return length of data in bytes.
Definition data_view.hpp:99
protozero::pbf_reader
Definition pbf_reader.hpp:62
protozero::pbf_reader::data
data_view data() const noexcept
Definition pbf_reader.hpp:252

Sub-messages are created using get_message():

pbf_reader message{...};
message.next();
pbf_reader submessage = message.get_message();
protozero::pbf_reader::next
bool next()
Definition pbf_reader.hpp:284
protozero::pbf_reader::get_message
pbf_reader get_message()
Definition pbf_reader.hpp:726

All methods of the pbf_reader class except get_bytes() and get_string() provide the strong exception guarantee, ie they either succeed or do not change the pbf_reader object they are called on. Use the get_view() method instead of get_bytes() or get_string(), if you need this guarantee.

## Constructor & Destructor Documentation

## ◆ pbf_reader() [1/5]

protozero::pbf_reader::pbf_reader | ( | const data_view & | view | ) |
| inline explicit noexcept

Construct a pbf_reader message from a data_view. The pointer from the data_view will be stored inside the pbf_reader object, no data is copied. So you must make sure the view stays valid as long as the pbf_reader object is used.

The buffer must contain a complete protobuf message.

Postcondition
  There is no current field.

## ◆ pbf_reader() [2/5]

protozero::pbf_reader::pbf_reader | ( | const char * | data,
|  | std::size_t | size
| ) |  |
| inline noexcept

Construct a pbf_reader message from a data pointer and a length. The pointer will be stored inside the pbf_reader object, no data is copied. So you must make sure the buffer stays valid as long as the pbf_reader object is used.

The buffer must contain a complete protobuf message.

Postcondition
  There is no current field.

## ◆ pbf_reader() [3/5]

protozero::pbf_reader::pbf_reader | ( | const std::pair< const char *, std::size_t > & | data | ) |
| inline explicit noexcept

Construct a pbf_reader message from a data pointer and a length. The pointer will be stored inside the pbf_reader object, no data is copied. So you must make sure the buffer stays valid as long as the pbf_reader object is used.

The buffer must contain a complete protobuf message.

Postcondition
  There is no current field.

Deprecated:
  Use one of the other constructors.

## ◆ pbf_reader() [4/5]

protozero::pbf_reader::pbf_reader | ( | const std::string & | data | ) |
| inline explicit noexcept

Construct a pbf_reader message from a std::string. A pointer to the string internals will be stored inside the pbf_reader object, no data is copied. So you must make sure the string is unchanged as long as the pbf_reader object is used.

The string must contain a complete protobuf message.

Postcondition
  There is no current field.

## ◆ pbf_reader() [5/5]

protozero::pbf_reader::pbf_reader | ( |  | ) |
| default noexcept

pbf_reader can be default constructed and behaves like it has an empty buffer.

## Member Function Documentation

## ◆ data()

data_view protozero::pbf_reader::data | ( |  | ) | const
| inline noexcept

Get a view of the not yet read data.

## ◆ get_bool()

bool protozero::pbf_reader::get_bool | ( |  | ) |
| inline

Consume and return value of current "bool" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "bool".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_bytes()

std::string protozero::pbf_reader::get_bytes | ( |  | ) |
| inline

Consume and return value of current "bytes" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "bytes".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_data()

std::pair< const char *, pbf_length_type > protozero::pbf_reader::get_data | ( |  | ) |
| inline

Consume and return value of current "bytes" or "string" field.

Returns
  A pair with a pointer to the data and the length of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "bytes" or "string".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_double()

double protozero::pbf_reader::get_double | ( |  | ) |
| inline

Consume and return value of current "double" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "double".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_enum()

int32_t protozero::pbf_reader::get_enum | ( |  | ) |
| inline

Consume and return value of current "enum" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "enum".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_fixed32()

uint32_t protozero::pbf_reader::get_fixed32 | ( |  | ) |
| inline

Consume and return value of current "fixed32" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "fixed32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_fixed64()

uint64_t protozero::pbf_reader::get_fixed64 | ( |  | ) |
| inline

Consume and return value of current "fixed64" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "fixed64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_float()

float protozero::pbf_reader::get_float | ( |  | ) |
| inline

Consume and return value of current "float" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "float".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_int32()

int32_t protozero::pbf_reader::get_int32 | ( |  | ) |
| inline

Consume and return value of current "int32" varint field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "int32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_int64()

int64_t protozero::pbf_reader::get_int64 | ( |  | ) |
| inline

Consume and return value of current "int64" varint field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "int64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_message()

pbf_reader protozero::pbf_reader::get_message | ( |  | ) |
| inline

Consume and return value of current "message" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "message".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_bool()

iterator_range< pbf_reader::const_bool_iterator > protozero::pbf_reader::get_packed_bool | ( |  | ) |
| inline

Consume current "repeated packed bool" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed bool".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_double()

iterator_range< pbf_reader::const_double_iterator > protozero::pbf_reader::get_packed_double | ( |  | ) |
| inline

Consume current "repeated packed double" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed double".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_enum()

iterator_range< pbf_reader::const_enum_iterator > protozero::pbf_reader::get_packed_enum | ( |  | ) |
| inline

Consume current "repeated packed enum" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed enum".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_fixed32()

iterator_range< pbf_reader::const_fixed32_iterator > protozero::pbf_reader::get_packed_fixed32 | ( |  | ) |
| inline

Consume current "repeated packed fixed32" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed fixed32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_fixed64()

iterator_range< pbf_reader::const_fixed64_iterator > protozero::pbf_reader::get_packed_fixed64 | ( |  | ) |
| inline

Consume current "repeated packed fixed64" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed fixed64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_float()

iterator_range< pbf_reader::const_float_iterator > protozero::pbf_reader::get_packed_float | ( |  | ) |
| inline

Consume current "repeated packed float" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed float".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_int32()

iterator_range< pbf_reader::const_int32_iterator > protozero::pbf_reader::get_packed_int32 | ( |  | ) |
| inline

Consume current "repeated packed int32" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed int32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_int64()

iterator_range< pbf_reader::const_int64_iterator > protozero::pbf_reader::get_packed_int64 | ( |  | ) |
| inline

Consume current "repeated packed int64" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed int64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_sfixed32()

iterator_range< pbf_reader::const_sfixed32_iterator > protozero::pbf_reader::get_packed_sfixed32 | ( |  | ) |
| inline

Consume current "repeated packed sfixed32" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed sfixed32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_sfixed64()

iterator_range< pbf_reader::const_sfixed64_iterator > protozero::pbf_reader::get_packed_sfixed64 | ( |  | ) |
| inline

Consume current "repeated packed sfixed64" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed sfixed64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_sint32()

iterator_range< pbf_reader::const_sint32_iterator > protozero::pbf_reader::get_packed_sint32 | ( |  | ) |
| inline

Consume current "repeated packed sint32" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed sint32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_sint64()

iterator_range< pbf_reader::const_sint64_iterator > protozero::pbf_reader::get_packed_sint64 | ( |  | ) |
| inline

Consume current "repeated packed sint64" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed sint64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_uint32()

iterator_range< pbf_reader::const_uint32_iterator > protozero::pbf_reader::get_packed_uint32 | ( |  | ) |
| inline

Consume current "repeated packed uint32" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed uint32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_packed_uint64()

iterator_range< pbf_reader::const_uint64_iterator > protozero::pbf_reader::get_packed_uint64 | ( |  | ) |
| inline

Consume current "repeated packed uint64" field.

Returns
  a pair of iterators to the beginning and one past the end of the data.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "repeated packed uint64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_sfixed32()

int32_t protozero::pbf_reader::get_sfixed32 | ( |  | ) |
| inline

Consume and return value of current "sfixed32" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "sfixed32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_sfixed64()

int64_t protozero::pbf_reader::get_sfixed64 | ( |  | ) |
| inline

Consume and return value of current "sfixed64" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "sfixed64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_sint32()

int32_t protozero::pbf_reader::get_sint32 | ( |  | ) |
| inline

Consume and return value of current "sint32" varint field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "sint32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_sint64()

int64_t protozero::pbf_reader::get_sint64 | ( |  | ) |
| inline

Consume and return value of current "sint64" varint field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "sint64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_string()

std::string protozero::pbf_reader::get_string | ( |  | ) |
| inline

Consume and return value of current "string" field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "string".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_uint32()

uint32_t protozero::pbf_reader::get_uint32 | ( |  | ) |
| inline

Consume and return value of current "uint32" varint field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "uint32".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_uint64()

uint64_t protozero::pbf_reader::get_uint64 | ( |  | ) |
| inline

Consume and return value of current "uint64" varint field.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "uint64".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ get_view()

data_view protozero::pbf_reader::get_view | ( |  | ) |
| inline

Consume and return value of current "bytes", "string", or "message" field.

Returns
  A data_view object.

Precondition
  There must be a current field (ie. next() must have returned `true`).
  The current field must be of type "bytes", "string", or "message".

Postcondition
  The current field was consumed and there is no current field now.

## ◆ has_wire_type()

bool protozero::pbf_reader::has_wire_type | ( | pbf_wire_type | type | ) | const
| inline noexcept

Check the wire type of the current field.

Returns
  `true` if the current field has the given wire type.

Precondition
  There must be a current field (ie. next() must have returned `true`).

## ◆ length()

std::size_t protozero::pbf_reader::length | ( |  | ) | const
| inline noexcept

Return the length in bytes of the current message. If you have already called next() and/or any of the get_*() functions, this will return the remaining length.

This can, for instance, be used to estimate the space needed for a buffer. Of course you have to know reasonably well what data to expect and how it is encoded for this number to have any meaning.

## ◆ next() [1/3]

bool protozero::pbf_reader::next | ( |  | ) |
| inline

Set next field in the message as the current field. This is usually called in a while loop:

pbf_reader message(...);
while (message.next()) {
// handle field
}

Returns
  `true` if there is a next field, `false` if not.

Precondition
  There must be no current field.

Postcondition
  If it returns `true` there is a current field now.

## ◆ next() [2/3]

bool protozero::pbf_reader::next | ( | pbf_tag_type | next_tag | ) |
| inline

Set next field with given tag in the message as the current field. Fields with other tags are skipped. This is usually called in a while loop for repeated fields:

pbf_reader message{...};
while (message.next(17)) {
// handle field
}

or you can call it just once to get the one field with this tag:

pbf_reader message{...};
if (message.next(17)) {
// handle field
}

Note that this will not check the wire type. The two-argument version of this function will also check the wire type.

Returns
  `true` if there is a next field with this tag.

Precondition
  There must be no current field.

Postcondition
  If it returns `true` there is a current field now with the given tag.

## ◆ next() [3/3]

bool protozero::pbf_reader::next | ( | pbf_tag_type | next_tag,
|  | pbf_wire_type | type
| ) |  |
| inline

Set next field with given tag and wire type in the message as the current field. Fields with other tags are skipped. This is usually called in a while loop for repeated fields:

pbf_reader message{...};
while (message.next(17, pbf_wire_type::varint)) {
// handle field
}

or you can call it just once to get the one field with this tag:

pbf_reader message{...};
if (message.next(17, pbf_wire_type::varint)) {
// handle field
}

Note that this will also check the wire type. The one-argument version of this function will not check the wire type.

Returns
  `true` if there is a next field with this tag.

Precondition
  There must be no current field.

Postcondition
  If it returns `true` there is a current field now with the given tag.

## ◆ operator bool()

protozero::pbf_reader::operator bool | ( |  | ) | const
| inline noexcept

In a boolean context the pbf_reader class evaluates to `true` if there are still fields available and to `false` if the last field has been read.

## ◆ skip()

void protozero::pbf_reader::skip | ( |  | ) |
| inline

Consume the current field.

Precondition
  There must be a current field (ie. next() must have returned `true`).

Postcondition
  The current field was consumed and there is no current field now.

## ◆ swap()

void protozero::pbf_reader::swap | ( | pbf_reader & | other | ) |
| inline noexcept

Swap the contents of this object with the other.

Parameters

  other | Other object to swap data with.

## ◆ tag()

pbf_tag_type protozero::pbf_reader::tag | ( |  | ) | const
| inline noexcept

The tag of the current field. The tag is the field number from the description in the .proto file.

Call next() before calling this function to set the current field.

Returns
  tag of the current field.

Precondition
  There must be a current field (ie. next() must have returned `true`).

## ◆ tag_and_type()

uint32_t protozero::pbf_reader::tag_and_type | ( |  | ) | const
| inline noexcept

Get the tag and wire type of the current field in one integer suitable for comparison with a switch statement.

Use it like this:

pbf_reader message{...};
while (message.next()) {
switch (message.tag_and_type()) {
case tag_and_type(17, pbf_wire_type::length_delimited):
....
break;
case tag_and_type(21, pbf_wire_type::varint):
....
break;
default:
message.skip();
}
}
protozero::pbf_reader::tag_and_type
uint32_t tag_and_type() const noexcept
Definition pbf_reader.hpp:442

## ◆ wire_type()

pbf_wire_type protozero::pbf_reader::wire_type | ( |  | ) | const
| inline noexcept

Get the wire type of the current field. The wire types are:

- 0 - varint
- 1 - 64 bit
- 2 - length-delimited
- 5 - 32 bit

All other types are illegal.

Call next() before calling this function to set the current field.

Returns
  wire type of the current field.

Precondition
  There must be a current field (ie. next() must have returned `true`).

The documentation for this class was generated from the following file:

- include/protozero/pbf_reader.hpp