Constructor

Create a FormatterLambda with a lambda function

@brief default constructor */

get nearest point(s) to val (assume valid intervals)

Move constructor

IOPin *****/

may return an invalid interval (as empty intersection)

is strictly valid interval (excluding degenerated ones, i.e., valid open interval)

Two types of intervals: 1. normal, 2. degenerated (i.e., point) is valid interval (i.e., valid closed interval)

default constructed iterator can be compared to itself, but WON'T return true when compared to end().

Making an option by hand is not defined, it must be made by the App class