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118 lines
4.4 KiB
Go
118 lines
4.4 KiB
Go
package slices
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import (
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"golang.org/x/exp/constraints"
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"golang.org/x/exp/slices"
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)
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// This file delegates to the official slices package, so that we end up with a superset of the official API.
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// Equal reports whether two slices are equal: the same length and all
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// elements equal. If the lengths are different, Equal returns false.
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// Otherwise, the elements are compared in increasing index order, and the
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// comparison stops at the first unequal pair.
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// Floating point NaNs are not considered equal.
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func Equal[E comparable](s1, s2 []E) bool {
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return slices.Equal(s1, s2)
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}
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// EqualFunc reports whether two slices are equal using a comparison
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// function on each pair of elements. If the lengths are different,
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// EqualFunc returns false. Otherwise, the elements are compared in
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// increasing index order, and the comparison stops at the first index
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// for which eq returns false.
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func EqualFunc[E1, E2 any](s1 []E1, s2 []E2, eq func(E1, E2) bool) bool {
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return slices.EqualFunc(s1, s2, eq)
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}
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// Compare compares the elements of s1 and s2.
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// The elements are compared sequentially, starting at index 0,
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// until one element is not equal to the other.
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// The result of comparing the first non-matching elements is returned.
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// If both slices are equal until one of them ends, the shorter slice is
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// considered less than the longer one.
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// The result is 0 if s1 == s2, -1 if s1 < s2, and +1 if s1 > s2.
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// Comparisons involving floating point NaNs are ignored.
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func Compare[E constraints.Ordered](s1, s2 []E) int {
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return slices.Compare(s1, s2)
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}
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// CompareFunc is like Compare but uses a comparison function
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// on each pair of elements. The elements are compared in increasing
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// index order, and the comparisons stop after the first time cmp
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// returns non-zero.
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// The result is the first non-zero result of cmp; if cmp always
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// returns 0 the result is 0 if len(s1) == len(s2), -1 if len(s1) < len(s2),
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// and +1 if len(s1) > len(s2).
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func CompareFunc[E1, E2 any](s1 []E1, s2 []E2, cmp func(E1, E2) int) int {
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return slices.CompareFunc(s1, s2, cmp)
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}
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// Index returns the index of the first occurrence of v in s,
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// or -1 if not present.
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func Index[E comparable](s []E, v E) int {
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return slices.Index(s, v)
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}
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// IndexFunc returns the first index i satisfying f(s[i]),
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// or -1 if none do.
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func IndexFunc[E any](s []E, f func(E) bool) int {
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return slices.IndexFunc(s, f)
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}
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// Contains reports whether v is present in s.
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func Contains[E comparable](s []E, v E) bool {
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return slices.Contains(s, v)
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}
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// Insert inserts the values v... into s at index i,
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// returning the modified slice.
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// In the returned slice r, r[i] == v[0].
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// Insert panics if i is out of range.
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// This function is O(len(s) + len(v)).
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func Insert[S ~[]E, E any](s S, i int, v ...E) S {
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return slices.Insert(s, i, v...)
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}
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// Delete removes the elements s[i:j] from s, returning the modified slice.
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// Delete panics if s[i:j] is not a valid slice of s.
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// Delete modifies the contents of the slice s; it does not create a new slice.
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// Delete is O(len(s)-(j-i)), so if many items must be deleted, it is better to
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// make a single call deleting them all together than to delete one at a time.
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func Delete[S ~[]E, E any](s S, i, j int) S {
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return slices.Delete(s, i, j)
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}
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// Clone returns a copy of the slice.
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// The elements are copied using assignment, so this is a shallow clone.
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func Clone[S ~[]E, E any](s S) S {
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return slices.Clone(s)
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}
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// Compact replaces consecutive runs of equal elements with a single copy.
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// This is like the uniq command found on Unix.
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// Compact modifies the contents of the slice s; it does not create a new slice.
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// Intended usage is to assign the result back to the input slice.
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func Compact[S ~[]E, E comparable](s S) S {
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return slices.Compact(s)
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}
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// CompactFunc is like Compact but uses a comparison function.
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func CompactFunc[S ~[]E, E any](s S, eq func(E, E) bool) S {
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return slices.CompactFunc(s, eq)
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}
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// Grow increases the slice's capacity, if necessary, to guarantee space for
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// another n elements. After Grow(n), at least n elements can be appended
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// to the slice without another allocation. Grow may modify elements of the
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// slice between the length and the capacity. If n is negative or too large to
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// allocate the memory, Grow panics.
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func Grow[S ~[]E, E any](s S, n int) S {
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return slices.Grow(s, n)
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}
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// Clip removes unused capacity from the slice, returning s[:len(s):len(s)].
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func Clip[S ~[]E, E any](s S) S {
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return slices.Clip(s)
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}
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