5.8 KiB
At each moment of time a libfort table has a current cell - cell to which data will be written in the next write operation.
Functions set_cur_cell and operator<<(fort::endr) can be used to change current cell:
/* Set current cell to the cell with coordinates (row, col) */
void set_cur_cell(size_t row, size_t col)
/* Set current cell to the first cell of the next row(line) */
table << fort::endr;
There are a lot of functions that can be used to fill tables with data. All write functions are grouped in pairs (function, function_ln), where function writes data to a group of consecutive cells, function_ln does the same and moves current-cell pointer to the first cell of the next row(line).
operator <<
This operator (<<) applied to a libfort table is known as insertion operator. It inserts string to the table cell. Internally libfort converts argument to a string using std::stringstream. If you want to insert argument of some custom type in a table you should overload std::stringstream::operator<<.
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 | 222.128 |
| 2 | Hamilton | 1:26.373 | 221.027 |
| 3 | Verstappen | 1:26.469 | 220.782 |
+---+------------+----------+-----------+
operator[]
This operator ([]) provides an ability to directly change content of a particular cell.
fort::char_table table;
table << fort::header;
table[0][0] = "N"; table[0][1] = "Driver"; table[0][2] = "Time"; table[0][3] = "Avg Speed";
table[1][0] = "1"; table[1][1] = "Ricciardo"; table[1][2] = "1:25.945"; table[1][3] = "47.362";
table[2][0] = "2"; table[2][1] = "Hamilton"; table[2][2] = "1:26.373"; table[2][3] = "35.02";
table[3][0] = "3"; table[3][1] = "Verstappen"; table[3][2] = "1:26.469"; table[3][3] = "29.78";
std::cout << table.to_string() << std::endl;
Output:
+---+------------+----------+-----------+
| N | Driver | Time | Avg Speed |
+---+------------+----------+-----------+
| 1 | Ricciardo | 1:25.945 | 222.128 |
| 2 | Hamilton | 1:26.373 | 221.027 |
| 3 | Verstappen | 1:26.469 | 220.782 |
+---+------------+----------+-----------+
write, write_ln
write, write_ln write an arbitrary number of string arguments to the table cells.
fort::char_table table;
table << fort::header;
table.write_ln("N", "Driver", "Time", "Avg Speed");
table.write_ln("1", "Ricciardo", "1:25.945", "47.362");
table.write_ln("2", "Hamilton", "1:26.373", "35.02");
table.write_ln("3", "Verstappen", "1:26.469", "29.78");
std::cout << table.to_string() << std::endl;
Output:
+---+------------+----------+-----------+
| N | Driver | Time | Avg Speed |
+---+------------+----------+-----------+
| 1 | Ricciardo | 1:25.945 | 222.128 |
| 2 | Hamilton | 1:26.373 | 221.027 |
| 3 | Verstappen | 1:26.469 | 220.782 |
+---+------------+----------+-----------+
range_write, range_write_ln
range_write, range_write_ln write data from a container determined by a pair of iterators.
template <typename InputIt>
bool range_write(InputIt first, InputIt last);
template <typename InputIt>
bool range_write_ln(InputIt first, InputIt last);
fort::char_table table;
table << fort::header;
std::vector<std::string> header = {"N", "Driver", "Time", "Avg Speed"};
std::list<std::string> line_1 = {"1", "Ricciardo", "1:25.945", "47.362"};
std::initializer_list<std::string> line_2 = {"2", "Hamilton", "1:26.373", "35.02"};
std::deque<std::string> line_3 = {"3", "Verstappen", "1:26.469", "29.78"};
table.range_write_ln(header.begin(), header.end());
table.range_write_ln(line_1.begin(), line_1.end());
table.range_write_ln(line_2.begin(), line_2.end());
table.range_write_ln(line_3.begin(), line_3.end());
std::cout << table.to_string() << std::endl;
Output:
+---+------------+----------+-----------+
| N | Driver | Time | Avg Speed |
+---+------------+----------+-----------+
| 1 | Ricciardo | 1:25.945 | 222.128 |
| 2 | Hamilton | 1:26.373 | 221.027 |
| 3 | Verstappen | 1:26.469 | 220.782 |
+---+------------+----------+-----------+