libfort/docs/tutorial/CPP_API/Table-life-cycle.md

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The common **libfort table** life cycle:
- create a table (with default constructor, copy constructor or move constructor);
- fill it with data (`operator <<`, `operator[]`, `write_ln` ...);
- modify basic table appearance;
- convert table to string representation (`to_string`) and print it.
All resources allocated during table lifetime will be automatically freed in destructor.
Example:
```CPP
fort::char_table table;
table << fort::header
<< "N" << "Driver" << "Time" << "Avg Speed" << fort::endr
<< "1" << "Ricciardo" << "1:25.945" << "47.362" << fort::endr
<< "2" << "Hamilton" << "1:26.373" << "35.02" << fort::endr
<< "3" << "Verstappen" << "1:26.469" << "29.78" << fort::endr;
std::cout << table.to_string() << std::endl;
```
Output:
```
+---+------------+----------+-----------+
| N | Driver | Time | Avg Speed |
+---+------------+----------+-----------+
| 1 | Ricciardo | 1:25.945 | 47.362 |
| 2 | Hamilton | 1:26.373 | 35.02 |
| 3 | Verstappen | 1:26.469 | 29.78 |
+---+------------+----------+-----------+
```