RangeIterator helper functions

Functions
RangeIterator	Qore::xrange (int start, int stop, int step=1, auto val)
	Returns a RangeIterator containing an arithmetic progression of integers. More...
RangeIterator	Qore::xrange (int stop)
	Returns a RangeIterator containing an arithmetic progression of integers with start = 0 and step = 1. More...

Detailed Description

RangeIterator helper functions allow to use RangeItartor in easier usage in loop statements.

Example

foreach int i in(xrange(5))
    printf("i=%d\n", i);
# resulting in:
# i=0
# i=1
# i=2
# i=3
# i=4
# i=5

Function Documentation

xrange() [1/2]

RangeIterator Qore::xrange	(	int	start,
		int	stop,
		int	step = 1,
		auto	val
	)

Returns a RangeIterator containing an arithmetic progression of integers.

Code Flags:

RET_VALUE_ONLY

Example:

xrange(2, 5); # 2, 3, 4, 5
xrange(2, -2); # 2, 1, 0, -1, -2
xrange(1, 10, 5); # 1, 6
xrange(0, 10, 5); # 0, 5, 10
xrange(-10, 10, 5); # -10, -5, 0, 5, 10
xrange(10, -10, 5); # 10, 5, 0, -5, -10

Parameters

start	the initial value
stop	the final value
step	the step; the default is 1; must be greater than 0; the function throws a RANGE-ERROR exception when this argument is < 1
val	an optional value to be returned instead of the default integer value

Return values

Returns

a RangeIterator containing an arithmetic progression of integers.

Exceptions

RANGEITERATOR-ERROR

this exception is thrown if step < 1

See also

range

Note

the main difference between range() and xrange() is that range returns a real list and xrange() returns a RangeIterator

Since

Qore 0.8.6

Qore 0.8.11.1 this function takes the optional val argument

xrange() [2/2]

RangeIterator Qore::xrange

(

int

stop

)

Returns a RangeIterator containing an arithmetic progression of integers with start = 0 and step = 1.

This is an overloaded version of xrange(int, int, int) meaning xrange(0, stop, 1)

Code Flags:

CONSTANT

Example:

xrange(1); # 0, 1
xrange(-3); # 0, -1, -2, -3

Parameters

stop	the final value

Return values

Returns

a RangeIterator containing an arithmetic progression of integers with start = 0 and step = 1.

See also

range

Note

the main difference between range() and xrange() is that range() returns a real list and xrange() returns a RangeIterator

Since

Qore 0.8.6