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retired
A standard library for the Gleam programming language
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src/gleam@order.erl
-module(gleam@order).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).
-export([negate/1, to_int/1, compare/2, reverse/1, break_tie/2, lazy_break_tie/2]).
-export_type([order/0]).
-type order() :: lt | eq | gt.
-spec negate(order()) -> order().
negate(Order) ->
case Order of
lt ->
gt;
eq ->
eq;
gt ->
lt
end.
-spec to_int(order()) -> integer().
to_int(Order) ->
case Order of
lt ->
-1;
eq ->
0;
gt ->
1
end.
-spec compare(order(), order()) -> order().
compare(A, B) ->
case {A, B} of
{X, Y} when X =:= Y ->
eq;
{lt, _} ->
lt;
{eq, gt} ->
lt;
{_, _} ->
gt
end.
-spec reverse(fun((I, I) -> order())) -> fun((I, I) -> order()).
reverse(Orderer) ->
fun(A, B) -> Orderer(B, A) end.
-spec break_tie(order(), order()) -> order().
break_tie(Order, Other) ->
case Order of
lt ->
Order;
gt ->
Order;
eq ->
Other
end.
-spec lazy_break_tie(order(), fun(() -> order())) -> order().
lazy_break_tie(Order, Comparison) ->
case Order of
lt ->
Order;
gt ->
Order;
eq ->
Comparison()
end.