For an overview of this library, along with tutorials and examples, see CodeQL for C/C++
Gets the operand on the “lesser” (or “lesser-or-equal”) side
of this relational expression, that is, the side that is smaller
if the overall expression evaluates to true; for example on
x <= 20 this is x, and on y > 0 it is the 0.
x <= 20
y > 0