package core_kernel

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package core_kernel
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type underlying = Base.Float.t

Span.t represents a span of time (e.g. 7 minutes, 3 hours, 12.8 days). The span may be positive or negative.

type t = private underlying
include Bin_prot.Binable.S with type t := t
include Bin_prot.Binable.S_only_functions with type t := t
val bin_size_t : t Bin_prot.Size.sizer
val bin_write_t : t Bin_prot.Write.writer
val bin_read_t : t Bin_prot.Read.reader
val __bin_read_t__ : (int -> t) Bin_prot.Read.reader

This function only needs implementation if t exposed to be a polymorphic variant. Despite what the type reads, this does *not* produce a function after reading; instead it takes the constructor tag (int) before reading and reads the rest of the variant t afterwards.

val bin_shape_t : Bin_prot.Shape.t
val bin_writer_t : t Bin_prot.Type_class.writer
val bin_reader_t : t Bin_prot.Type_class.reader
include Ppx_sexp_conv_lib.Sexpable.S with type t := t
val t_of_sexp : Sexplib0.Sexp.t -> t
val sexp_of_t : t -> Sexplib0.Sexp.t
include Typerep_lib.Typerepable.S with type t := t
val typename_of_t : t Typerep_lib.Typename.t
module Parts : sig ... end
include Interfaces.Comparable_binable with type t := t
include Base.Comparable.S with type t := t
include Base.Comparisons.S with type t := t
include Base.Comparisons.Infix with type t := t
val (>=) : t -> t -> bool
val (<=) : t -> t -> bool
val (=) : t -> t -> bool
val (>) : t -> t -> bool
val (<) : t -> t -> bool
val (<>) : t -> t -> bool
val equal : t -> t -> bool
val compare : t -> t -> int

compare t1 t2 returns 0 if t1 is equal to t2, a negative integer if t1 is less than t2, and a positive integer if t1 is greater than t2.

val min : t -> t -> t
val max : t -> t -> t
val ascending : t -> t -> int

ascending is identical to compare. descending x y = ascending y x. These are intended to be mnemonic when used like List.sort ~compare:ascending and List.sort ~cmp:descending, since they cause the list to be sorted in ascending or descending order, respectively.

val descending : t -> t -> int
val between : t -> low:t -> high:t -> bool

between t ~low ~high means low <= t <= high

val clamp_exn : t -> min:t -> max:t -> t

clamp_exn t ~min ~max returns t', the closest value to t such that between t' ~low:min ~high:max is true.

Raises if not (min <= max).

val clamp : t -> min:t -> max:t -> t Base.Or_error.t
include Base.Comparator.S with type t := t
type comparator_witness
val validate_lbound : min:t Base.Maybe_bound.t -> t Base.Validate.check
val validate_ubound : max:t Base.Maybe_bound.t -> t Base.Validate.check
val validate_bound : min:t Base.Maybe_bound.t -> max:t Base.Maybe_bound.t -> t Base.Validate.check
module Replace_polymorphic_compare : sig ... end
include Comparator.S with type t := t with type comparator_witness := comparator_witness
module Map : sig ... end
module Set : sig ... end
include Comparable.With_zero with type t := t
val validate_positive : t Base.Validate.check
val validate_non_negative : t Base.Validate.check
val validate_negative : t Base.Validate.check
val validate_non_positive : t Base.Validate.check
val is_positive : t -> bool
val is_non_negative : t -> bool
val is_negative : t -> bool
val is_non_positive : t -> bool
val sign : t -> Base__.Sign0.t

Returns Neg, Zero, or Pos in a way consistent with the above functions.

include Interfaces.Hashable_binable with type t := t
val hash_fold_t : Base.Hash.state -> t -> Base.Hash.state
val hash : t -> Base.Hash.hash_value
val hashable : t Base.Hashable.t
module Table : sig ... end
module Hash_set : sig ... end
module Hash_queue : sig ... end
include Base.Pretty_printer.S with type t := t
val pp : Base.Formatter.t -> t -> unit
include Interfaces.Robustly_comparable with type t := t
val (>=.) : t -> t -> bool
val (<=.) : t -> t -> bool
val (=.) : t -> t -> bool
val (>.) : t -> t -> bool
val (<.) : t -> t -> bool
val (<>.) : t -> t -> bool
val robustly_compare : t -> t -> int
val to_string : t -> Base.String.t

Time spans are denominated as a float suffixed by a unit of time; the valid suffixes are listed below:

d - days h - hours m - minutes s - seconds ms - milliseconds us - microseconds ns - nanoseconds

to_string and sexp_of_t use a mixed-unit format, which breaks the input span into parts and concatenates them in descending order of unit size. For example, pi days is rendered as "3d3h23m53.60527015815s". If the span is negative, a single "-" precedes the entire string. For extremely large (>10^15 days) or small (<1us) spans, a unit may be repeated to ensure the string conversion round-trips.

of_string and t_of_sexp accept any combination of (nonnegative float string)(unit of time suffix) in any order, without spaces, and sums up the durations of each of the parts for the magnitude of the span. The input may be prefixed by "-" for negative spans.

String and sexp conversions round-trip precisely, that is:

Span.of_string (Span.to_string t) = t
val of_string : Base.String.t -> t
values
val nanosecond : t
val microsecond : t
val millisecond : t
val second : t
val minute : t
val hour : t
val day : t
val robust_comparison_tolerance : t

10^-6 seconds, used in robustly comparable operators (<., >., =., ...) to determine equality

val zero : t
val create : ?sign:Sign.t -> ?day:Base.Int.t -> ?hr:Base.Int.t -> ?min:Base.Int.t -> ?sec:Base.Int.t -> ?ms:Base.Int.t -> ?us:Base.Int.t -> ?ns:Base.Int.t -> Base.Unit.t -> t

?sign defaults to positive. Setting it to negative is equivalent to negating all the integers.

val to_parts : t -> Parts.t
converters
val of_ns : Base.Float.t -> t
val of_us : Base.Float.t -> t
val of_ms : Base.Float.t -> t
val of_sec : Base.Float.t -> t
val of_int_sec : Base.Int.t -> t
val of_int32_seconds : Int32.t -> t
val of_int63_seconds : Int63.t -> t
val of_min : Base.Float.t -> t
val of_hr : Base.Float.t -> t
val of_day : Base.Float.t -> t
val to_ns : t -> Base.Float.t
val to_us : t -> Base.Float.t
val to_ms : t -> Base.Float.t
val to_sec : t -> Base.Float.t
val to_min : t -> Base.Float.t
val to_hr : t -> Base.Float.t
val to_day : t -> Base.Float.t
val to_int63_seconds_round_down_exn : t -> Int63.t

to_int63_seconds_round_down_exn t returns the number of seconds represented by t, rounded down, raising if the result is not representable as an Int63.t.

val to_proportional_float : t -> Base.Float.t

The only condition to_proportional_float is supposed to satisfy is that for all t1, t2 : t: to_proportional_float t1 /. to_proportional_float t2 = t1 // t2.

Basic operations on spans

The arithmetic operations rely on the behavior of the underlying representation of a span. For example, if addition overflows with float-represented spans, the result is an infinite span; with fixed-width integer-represented spans, the result silently wraps around as in two's-complement arithmetic.

val (+) : t -> t -> t
val (-) : t -> t -> t
val abs : t -> t

absolute value

val neg : t -> t

negation

val scale : t -> Base.Float.t -> t
val (/) : t -> Base.Float.t -> t
val (//) : t -> t -> Base.Float.t
val next : t -> t

next t is the smallest representable span greater than t (and therefore representation-dependent)

val prev : t -> t

prev t is the largest representable span less than t (and therefore representation-dependent)

val to_short_string : t -> Base.String.t

to_short_string t pretty-prints approximate time span using no more than five characters if the span is positive, and six if the span is negative. Examples

  • "4h" = 4 hours
  • "5m" = 5 minutes
  • "4s" = 4 seconds
  • "10ms" = 10 milliseconds

only the most significant denomination is shown.

val to_unit_of_time : t -> Unit_of_time.t

to_unit_of_time t = Day if abs t >= day, Hour if abs t >= hour, and so on down to Microsecond if abs t >= microsecond, and Nanosecond otherwise.

val of_unit_of_time : Unit_of_time.t -> t

of_unit_of_time unit_of_time produces a t representing the corresponding span.

val to_string_hum : ?delimiter:Base.Char.t -> ?decimals:Base.Int.t -> ?align_decimal:Base.Bool.t -> ?unit_of_time:Unit_of_time.t -> t -> Base.String.t

to_string_hum t ~delimiter ~decimals ~align_decimal ~unit_of_time formats t using the given unit of time, or the largest appropriate units if none is specified, among "d"=day, "h"=hour, "m"=minute, "s"=second, "ms"=millisecond, "us"=microsecond, or "ns"=nanosecond. The magnitude of the time span in the chosen unit is formatted by:

Float.to_string_hum ~delimiter ~decimals ~strip_zero:(not align_decimal)

If align_decimal is true, the single-character suffixes are padded with an extra space character. In combination with not stripping zeroes, this means that the decimal point will occur a fixed number of characters from the end of the string.

val randomize : t -> percent:Percent.t -> t

randomize t ~percent returns a span +/- percent * original span. Percent must be between 0% and 100% inclusive, and must be positive.

module Private : sig ... end
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