From 1f61c28a5d33a6d92609319ab10fc1fcca3089a6 Mon Sep 17 00:00:00 2001
From: b97tsk <b97tsk@gmail.com>
Date: Mon, 12 Aug 2024 08:00:00 +0800
Subject: [PATCH] drop dependency on golang.org/x/exp/constraints

---
 constraints.go | 6 ++++++
 go.mod         | 2 --
 go.sum         | 2 --
 pair.go        | 4 +---
 range.go       | 6 ++----
 5 files changed, 9 insertions(+), 11 deletions(-)
 create mode 100644 constraints.go
 delete mode 100644 go.sum

diff --git a/constraints.go b/constraints.go
new file mode 100644
index 00000000..9db6f839
--- /dev/null
+++ b/constraints.go
@@ -0,0 +1,6 @@
+package rx
+
+// Integer is a constraint that permits any integer type.
+type Integer interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64 | ~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
+}
diff --git a/go.mod b/go.mod
index 829b29e5..928f0e8f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,4 @@ module github.com/b97tsk/rx
 
 go 1.22.0
 
-require golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8
-
 retract [v0.0.1, v0.9.0]
diff --git a/go.sum b/go.sum
deleted file mode 100644
index dcd770d4..00000000
--- a/go.sum
+++ /dev/null
@@ -1,2 +0,0 @@
-golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8 h1:yixxcjnhBmY0nkL253HFVIm0JsFHwrHdT3Yh6szTnfY=
-golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8/go.mod h1:jj3sYF3dwk5D+ghuXyeI3r5MFf+NT2An6/9dOA95KSI=
diff --git a/pair.go b/pair.go
index 04f76a0e..6527cd04 100644
--- a/pair.go
+++ b/pair.go
@@ -1,7 +1,5 @@
 package rx
 
-import "golang.org/x/exp/constraints"
-
 // A Pair is a struct of two elements.
 type Pair[K, V any] struct {
 	Key   K
@@ -97,7 +95,7 @@ func RightOf[_ Pair[K, V], K, V any]() Operator[Pair[K, V], V] {
 // Enumerate maps each value emitted by the source [Observable] to a [Pair]
 // where the Key field stores the index of each value starting from init
 // and the Value field stores each value.
-func Enumerate[V any, K constraints.Integer](init K) Operator[V, Pair[K, V]] {
+func Enumerate[V any, K Integer](init K) Operator[V, Pair[K, V]] {
 	return NewOperator(
 		func(source Observable[V]) Observable[Pair[K, V]] {
 			return func(c Context, o Observer[Pair[K, V]]) {
diff --git a/range.go b/range.go
index 958b733d..458e666b 100644
--- a/range.go
+++ b/range.go
@@ -1,10 +1,8 @@
 package rx
 
-import "golang.org/x/exp/constraints"
-
 // Range creates an [Observable] that emits a sequence of integers
 // within a specified range.
-func Range[T constraints.Integer](low, high T) Observable[T] {
+func Range[T Integer](low, high T) Observable[T] {
 	return func(c Context, o Observer[T]) {
 		done := c.Done()
 
@@ -25,7 +23,7 @@ func Range[T constraints.Integer](low, high T) Observable[T] {
 
 // Iota creates an [Observable] that emits an infinite sequence of integers
 // starting from init.
-func Iota[T constraints.Integer](init T) Observable[T] {
+func Iota[T Integer](init T) Observable[T] {
 	return func(c Context, o Observer[T]) {
 		done := c.Done()