Function std.algorithm.searching.minPos
Computes a subrange of range starting at the first occurrence of range's
minimum (respectively maximum) and with the same ending as range, or the
empty range if range itself is empty.
Range minPos(alias pred, Range)
(
Range range
)
if (isForwardRange!Range && !isInfinite!Range && is(typeof(binaryFun!pred(range
Formally, the minimum is a value x in range such that pred(a, x) is
false for all values a in range. Conversely, the maximum is a value x in
range such that pred(x, a) is false for all values a in range (note
the swapped arguments to pred).
These functions may be used for computing arbitrary extrema by choosing pred
appropriately. For corrrect functioning, pred must be a strict partial order,
i.e. transitive (if pred(a, b) && pred(b, c) then pred(a, c)) and
irreflexive (pred(a, a) is false).
Parameters
| Name | Description |
|---|---|
| pred | The ordering predicate to use to determine the extremum (minimum or maximum) element. |
| range | The forward range to search. |
Returns
The position of the minimum (respectively maximum) element of forward
range range, i.e. a subrange of range starting at the position of its
smallest (respectively largest) element and with the same ending as range.
Limitations
If at least one of the arguments is NaN, the result is
an unspecified value. See maxElement
for examples on how to cope with NaNs.
See Also
Example
int[] a = [ 2, 3, 4, 1, 2, 4, 1, 1, 2 ];
// Minimum is 1 and first occurs in position 3
writeln(a