/*!
@page bigtable-hello-world Example: C++ Hello World Application

This example is a very simple "hello world" application, written in C++, that
illustrates how to:

- Connect to a Cloud Bigtable instance.
- Create a new table.
- Write data to the table.
- Read the data back.
- Delete the table.

## Running the example

This example uses the [Cloud Bigtable C++ Client Library][reference-link]
to communicate with Cloud Bigtable.

To run the example program, follow the [instructions][github-examples] for the
example on GitHub.

[reference-link]: https://googleapis.github.io/google-cloud-cpp
[github-examples]: https://github.com/googleapis/google-cloud-cpp/tree/master/google/cloud/bigtable/examples/

## Including the Necessary Headers

The example uses the following headers:

@snippet bigtable_hello_world.cc bigtable includes

## Introduce aliases to make the example more readable

@snippet bigtable_hello_world.cc aliases

## Connecting to Cloud Bigtable to manage tables

To manage tables, connect to Cloud Bigtable using
`bigtable::CreateDefaultAdminClient()`:

@snippet bigtable_hello_world.cc connect admin

@see [bigtable::TableAdmin][TableAdmin] for more information on how to perform
    administrative operations on tables.

## Creating a table

Create a table with [TableAdmin::CreateTable()][TableAdmin-CreateTable]:

@snippet bigtable_hello_world.cc create table

@see [bigtable::TableAdmin][TableAdmin] for additional operations to list,
    read, modify, and delete tables.
@see https://cloud.google.com/bigtable/docs/overview for an overview of the
    Cloud Bigtable storage model, including an introduction to important
    Cloud Bigtable concepts, such as *row keys*, *column families*, *columns*,
    and *cells*.
@see https://cloud.google.com/bigtable/docs/schema-design for suggestions on
    how to design your table schema.

## Connecting to Cloud Bigtable to read and write data

To read and write data, connect to Cloud Bigtable using
`bigtable::CreateDefaultDataClient()`:

@snippet bigtable_hello_world.cc connect data

@see [bigtable::Table][Table] for the functions to read and write data to
    Cloud Bigtable.

## Writing Rows to a table

To write a single row use [Table::Apply()][Table-Apply]:

@snippet bigtable_hello_world.cc write rows

@see [Table::BulkApply()][Table-BulkApply] to modify multiple rows in a single
    request.
@see `DeleteFromFamily()`, `DeleteFromRow()`, `DeleteFromColumn()` to delete
    some (or all) the cells in a row.
@see One of the overloads for `SetCell()` allows setting an explicit timestamp,
    which is an idempotent mutation and thus can be automatically retried on
    transient errors.

## Creating filter for the column families

Use a filter to select only a subset of the cells in a row, in this case, we
will select only the rows in the `family` column family and the `c0` column:

@snippet bigtable_hello_world.cc create filter

@see [bigtable::Filter][Filter] to filter the column families, columns, and even
  the timestamps returned by `ReadRow()`.

## Reading data back: get a single row by its key

Get a row directly using its key with [Table::ReadRow()][Table-ReadRow]:

@snippet bigtable_hello_world.cc read row

@see [bigtable::Filter][Filter] to filter the column families, columns, and even
    the timestamps returned by `ReadRow()`.
@see [Table::ReadRows()][Table-ReadRows] to iterate over
    multiple rows.

## Reading data back: scanning all table rows

Use [Table::ReadRows()][Table-ReadRows] to scan all of the rows in a table.

@snippet bigtable_hello_world.cc scan all

@see [bigtable::RowRange][RowRange] to read only a portion of the table.
@see [bigtable::RowSet][RowSet] to form arbitrary groups of ranges and specific
    row keys in a [Table::ReadRows()][Table-ReadRows] request.
@see [bigtable::Row][Row] for details of the contents in a row.

## Deleting a table

Delete a table with [TableAdmin::DeleteTable()][TableAdmin-DeleteTable].

@snippet bigtable_hello_world.cc delete table

## Putting it all together

Here is the full example

@snippet bigtable_hello_world.cc all code

[Filter]:          @ref google::cloud::bigtable::v1::Filter
[InstanceAdmin]:   @ref google::cloud::bigtable::v1::InstanceAdmin
[Mutation]:        @ref google::cloud::bigtable::v1::Mutation
[Row]:             @ref google::cloud::bigtable::v1::Row
[RowRange]:        @ref google::cloud::bigtable::v1::RowRange
[RowSet]:          @ref google::cloud::bigtable::v1::RowSet
[Table]:           @ref google::cloud::bigtable::v1::Table
[Table-Apply]:     @ref google::cloud::bigtable::v1::Table::Apply
[Table-BulkApply]: @ref google::cloud::bigtable::v1::Table::BulkApply
[Table-ReadRow]:   @ref google::cloud::bigtable::v1::Table::ReadRow
[Table-ReadRows]:  @ref google::cloud::bigtable::v1::Table::ReadRows
[TableAdmin]:      @ref google::cloud::bigtable::v1::TableAdmin
[TableAdmin-CreateTable]:  @ref google::cloud::bigtable::v1::TableAdmin::CreateTable
[TableAdmin-DeleteTable]:  @ref google::cloud::bigtable::v1::TableAdmin::DeleteTable

*/