| // Copyright (c) 2022 Uber Technologies, Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| //go:build go1.18 |
| // +build go1.18 |
| |
| package atomic |
| |
| import ( |
| "testing" |
| |
| "github.com/stretchr/testify/require" |
| ) |
| |
| func TestPointer(t *testing.T) { |
| type foo struct{ v int } |
| |
| i := foo{42} |
| j := foo{0} |
| k := foo{1} |
| |
| tests := []struct { |
| desc string |
| newAtomic func() *Pointer[foo] |
| initial *foo |
| }{ |
| { |
| desc: "New", |
| newAtomic: func() *Pointer[foo] { |
| return NewPointer(&i) |
| }, |
| initial: &i, |
| }, |
| { |
| desc: "New/nil", |
| newAtomic: func() *Pointer[foo] { |
| return NewPointer[foo](nil) |
| }, |
| initial: nil, |
| }, |
| { |
| desc: "zero value", |
| newAtomic: func() *Pointer[foo] { |
| var p Pointer[foo] |
| return &p |
| }, |
| initial: nil, |
| }, |
| } |
| |
| for _, tt := range tests { |
| t.Run(tt.desc, func(t *testing.T) { |
| t.Run("Load", func(t *testing.T) { |
| atom := tt.newAtomic() |
| require.Equal(t, tt.initial, atom.Load(), "Load should report nil.") |
| }) |
| |
| t.Run("Swap", func(t *testing.T) { |
| atom := tt.newAtomic() |
| require.Equal(t, tt.initial, atom.Swap(&k), "Swap didn't return the old value.") |
| require.Equal(t, &k, atom.Load(), "Swap didn't set the correct value.") |
| }) |
| |
| t.Run("CAS", func(t *testing.T) { |
| atom := tt.newAtomic() |
| require.True(t, atom.CompareAndSwap(tt.initial, &j), "CAS didn't report a swap.") |
| require.Equal(t, &j, atom.Load(), "CAS didn't set the correct value.") |
| }) |
| |
| t.Run("Store", func(t *testing.T) { |
| atom := tt.newAtomic() |
| atom.Store(&i) |
| require.Equal(t, &i, atom.Load(), "Store didn't set the correct value.") |
| }) |
| }) |
| } |
| } |