mirror of
https://gitee.com/johng/gf.git
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649 lines
16 KiB
Go
649 lines
16 KiB
Go
// Copyright 2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package garray
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import (
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"bytes"
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"encoding/json"
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"math"
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"sort"
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"github.com/gogf/gf/internal/rwmutex"
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"github.com/gogf/gf/util/gconv"
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"github.com/gogf/gf/util/grand"
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)
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type IntArray struct {
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mu *rwmutex.RWMutex
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array []int
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}
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// NewIntArray creates and returns an empty array.
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// The parameter <safe> is used to specify whether using array in concurrent-safety,
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// which is false in default.
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func NewIntArray(safe ...bool) *IntArray {
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return NewIntArraySize(0, 0, safe...)
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}
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// NewIntArraySize create and returns an array with given size and cap.
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// The parameter <safe> is used to specify whether using array in concurrent-safety,
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// which is false in default.
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func NewIntArraySize(size int, cap int, safe ...bool) *IntArray {
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return &IntArray{
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mu: rwmutex.New(safe...),
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array: make([]int, size, cap),
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}
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}
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// NewIntArrayFrom creates and returns an array with given slice <array>.
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// The parameter <safe> is used to specify whether using array in concurrent-safety,
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// which is false in default.
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func NewIntArrayFrom(array []int, safe ...bool) *IntArray {
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return &IntArray{
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mu: rwmutex.New(safe...),
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array: array,
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}
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}
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// NewIntArrayFromCopy creates and returns an array from a copy of given slice <array>.
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// The parameter <safe> is used to specify whether using array in concurrent-safety,
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// which is false in default.
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func NewIntArrayFromCopy(array []int, safe ...bool) *IntArray {
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newArray := make([]int, len(array))
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copy(newArray, array)
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return &IntArray{
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mu: rwmutex.New(safe...),
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array: newArray,
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}
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}
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// Get returns the value of the specified index,
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// the caller should notice the boundary of the array.
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func (a *IntArray) Get(index int) int {
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a.mu.RLock()
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defer a.mu.RUnlock()
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value := a.array[index]
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return value
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}
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// Set sets value to specified index.
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func (a *IntArray) Set(index int, value int) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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a.array[index] = value
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return a
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}
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// SetArray sets the underlying slice array with the given <array>.
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func (a *IntArray) SetArray(array []int) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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a.array = array
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return a
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}
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// Replace replaces the array items by given <array> from the beginning of array.
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func (a *IntArray) Replace(array []int) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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max := len(array)
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if max > len(a.array) {
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max = len(a.array)
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}
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for i := 0; i < max; i++ {
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a.array[i] = array[i]
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}
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return a
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}
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// Sum returns the sum of values in an array.
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func (a *IntArray) Sum() (sum int) {
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a.mu.RLock()
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defer a.mu.RUnlock()
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for _, v := range a.array {
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sum += v
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}
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return
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}
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// Sort sorts the array in increasing order.
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// The parameter <reverse> controls whether sort
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// in increasing order(default) or decreasing order
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func (a *IntArray) Sort(reverse ...bool) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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if len(reverse) > 0 && reverse[0] {
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sort.Slice(a.array, func(i, j int) bool {
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if a.array[i] < a.array[j] {
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return false
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}
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return true
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})
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} else {
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sort.Ints(a.array)
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}
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return a
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}
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// SortFunc sorts the array by custom function <less>.
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func (a *IntArray) SortFunc(less func(v1, v2 int) bool) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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sort.Slice(a.array, func(i, j int) bool {
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return less(a.array[i], a.array[j])
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})
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return a
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}
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// InsertBefore inserts the <value> to the front of <index>.
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func (a *IntArray) InsertBefore(index int, value int) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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rear := append([]int{}, a.array[index:]...)
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a.array = append(a.array[0:index], value)
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a.array = append(a.array, rear...)
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return a
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}
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// InsertAfter inserts the <value> to the back of <index>.
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func (a *IntArray) InsertAfter(index int, value int) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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rear := append([]int{}, a.array[index+1:]...)
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a.array = append(a.array[0:index+1], value)
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a.array = append(a.array, rear...)
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return a
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}
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// Remove removes an item by index.
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func (a *IntArray) Remove(index int) int {
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a.mu.Lock()
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defer a.mu.Unlock()
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// Determine array boundaries when deleting to improve deletion efficiency.
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if index == 0 {
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value := a.array[0]
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a.array = a.array[1:]
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return value
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} else if index == len(a.array)-1 {
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value := a.array[index]
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a.array = a.array[:index]
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return value
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}
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// If it is a non-boundary delete,
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// it will involve the creation of an array,
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// then the deletion is less efficient.
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value := a.array[index]
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a.array = append(a.array[:index], a.array[index+1:]...)
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return value
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}
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// PushLeft pushes one or multiple items to the beginning of array.
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func (a *IntArray) PushLeft(value ...int) *IntArray {
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a.mu.Lock()
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a.array = append(value, a.array...)
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a.mu.Unlock()
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return a
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}
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// PushRight pushes one or multiple items to the end of array.
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// It equals to Append.
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func (a *IntArray) PushRight(value ...int) *IntArray {
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a.mu.Lock()
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a.array = append(a.array, value...)
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a.mu.Unlock()
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return a
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}
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// PopLeft pops and returns an item from the beginning of array.
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func (a *IntArray) PopLeft() int {
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a.mu.Lock()
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defer a.mu.Unlock()
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value := a.array[0]
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a.array = a.array[1:]
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return value
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}
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// PopRight pops and returns an item from the end of array.
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func (a *IntArray) PopRight() int {
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a.mu.Lock()
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defer a.mu.Unlock()
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index := len(a.array) - 1
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value := a.array[index]
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a.array = a.array[:index]
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return value
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}
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// PopRand randomly pops and return an item out of array.
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func (a *IntArray) PopRand() int {
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return a.Remove(grand.Intn(len(a.array)))
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}
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// PopRands randomly pops and returns <size> items out of array.
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func (a *IntArray) PopRands(size int) []int {
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a.mu.Lock()
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defer a.mu.Unlock()
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if size > len(a.array) {
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size = len(a.array)
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}
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array := make([]int, size)
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for i := 0; i < size; i++ {
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index := grand.Intn(len(a.array))
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array[i] = a.array[index]
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a.array = append(a.array[:index], a.array[index+1:]...)
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}
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return array
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}
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// PopLefts pops and returns <size> items from the beginning of array.
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func (a *IntArray) PopLefts(size int) []int {
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a.mu.Lock()
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defer a.mu.Unlock()
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length := len(a.array)
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if size > length {
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size = length
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}
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value := a.array[0:size]
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a.array = a.array[size:]
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return value
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}
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// PopRights pops and returns <size> items from the end of array.
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func (a *IntArray) PopRights(size int) []int {
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a.mu.Lock()
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defer a.mu.Unlock()
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index := len(a.array) - size
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if index < 0 {
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index = 0
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}
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value := a.array[index:]
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a.array = a.array[:index]
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return value
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}
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// Range picks and returns items by range, like array[start:end].
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// Notice, if in concurrent-safe usage, it returns a copy of slice;
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// else a pointer to the underlying data.
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//
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// If <end> is negative, then the offset will start from the end of array.
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// If <end> is omitted, then the sequence will have everything from start up
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// until the end of the array.
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func (a *IntArray) Range(start int, end ...int) []int {
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a.mu.RLock()
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defer a.mu.RUnlock()
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offsetEnd := len(a.array)
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if len(end) > 0 && end[0] < offsetEnd {
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offsetEnd = end[0]
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}
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if start > offsetEnd {
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return nil
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}
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if start < 0 {
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start = 0
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}
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array := ([]int)(nil)
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if a.mu.IsSafe() {
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array = make([]int, offsetEnd-start)
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copy(array, a.array[start:offsetEnd])
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} else {
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array = a.array[start:offsetEnd]
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}
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return array
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}
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// SubSlice returns a slice of elements from the array as specified
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// by the <offset> and <size> parameters.
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// If in concurrent safe usage, it returns a copy of the slice; else a pointer.
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//
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// If offset is non-negative, the sequence will start at that offset in the array.
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// If offset is negative, the sequence will start that far from the end of the array.
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//
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// If length is given and is positive, then the sequence will have up to that many elements in it.
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// If the array is shorter than the length, then only the available array elements will be present.
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// If length is given and is negative then the sequence will stop that many elements from the end of the array.
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// If it is omitted, then the sequence will have everything from offset up until the end of the array.
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//
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// Any possibility crossing the left border of array, it will fail.
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func (a *IntArray) SubSlice(offset int, length ...int) []int {
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a.mu.RLock()
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defer a.mu.RUnlock()
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size := len(a.array)
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if len(length) > 0 {
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size = length[0]
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}
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if offset > len(a.array) {
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return nil
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}
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if offset < 0 {
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offset = len(a.array) + offset
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if offset < 0 {
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return nil
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}
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}
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if size < 0 {
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offset += size
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size = -size
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if offset < 0 {
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return nil
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}
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}
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end := offset + size
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if end > len(a.array) {
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end = len(a.array)
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size = len(a.array) - offset
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}
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if a.mu.IsSafe() {
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s := make([]int, size)
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copy(s, a.array[offset:])
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return s
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} else {
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return a.array[offset:end]
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}
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}
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// See PushRight.
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func (a *IntArray) Append(value ...int) *IntArray {
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a.mu.Lock()
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a.array = append(a.array, value...)
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a.mu.Unlock()
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return a
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}
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// Len returns the length of array.
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func (a *IntArray) Len() int {
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a.mu.RLock()
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length := len(a.array)
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a.mu.RUnlock()
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return length
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}
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// Slice returns the underlying data of array.
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// Note that, if it's in concurrent-safe usage, it returns a copy of underlying data,
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// or else a pointer to the underlying data.
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func (a *IntArray) Slice() []int {
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array := ([]int)(nil)
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if a.mu.IsSafe() {
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a.mu.RLock()
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defer a.mu.RUnlock()
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array = make([]int, len(a.array))
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copy(array, a.array)
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} else {
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array = a.array
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}
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return array
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}
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// Interfaces returns current array as []interface{}.
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func (a *IntArray) Interfaces() []interface{} {
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a.mu.RLock()
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defer a.mu.RUnlock()
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array := make([]interface{}, len(a.array))
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for k, v := range a.array {
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array[k] = v
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}
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return array
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}
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// Clone returns a new array, which is a copy of current array.
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func (a *IntArray) Clone() (newArray *IntArray) {
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a.mu.RLock()
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array := make([]int, len(a.array))
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copy(array, a.array)
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a.mu.RUnlock()
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return NewIntArrayFrom(array, !a.mu.IsSafe())
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}
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// Clear deletes all items of current array.
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func (a *IntArray) Clear() *IntArray {
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a.mu.Lock()
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if len(a.array) > 0 {
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a.array = make([]int, 0)
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}
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a.mu.Unlock()
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return a
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}
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// Contains checks whether a value exists in the array.
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func (a *IntArray) Contains(value int) bool {
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return a.Search(value) != -1
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}
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// Search searches array by <value>, returns the index of <value>,
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// or returns -1 if not exists.
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func (a *IntArray) Search(value int) int {
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if len(a.array) == 0 {
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return -1
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}
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a.mu.RLock()
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result := -1
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for index, v := range a.array {
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if v == value {
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result = index
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break
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}
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}
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a.mu.RUnlock()
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return result
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}
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// Unique uniques the array, clear repeated items.
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func (a *IntArray) Unique() *IntArray {
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a.mu.Lock()
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for i := 0; i < len(a.array)-1; i++ {
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for j := i + 1; j < len(a.array); j++ {
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if a.array[i] == a.array[j] {
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a.array = append(a.array[:j], a.array[j+1:]...)
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}
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}
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}
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a.mu.Unlock()
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return a
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}
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// LockFunc locks writing by callback function <f>.
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func (a *IntArray) LockFunc(f func(array []int)) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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f(a.array)
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return a
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}
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// RLockFunc locks reading by callback function <f>.
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func (a *IntArray) RLockFunc(f func(array []int)) *IntArray {
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a.mu.RLock()
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defer a.mu.RUnlock()
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f(a.array)
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return a
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}
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// Merge merges <array> into current array.
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// The parameter <array> can be any garray or slice type.
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// The difference between Merge and Append is Append supports only specified slice type,
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// but Merge supports more parameter types.
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func (a *IntArray) Merge(array interface{}) *IntArray {
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switch v := array.(type) {
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case *Array:
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a.Append(gconv.Ints(v.Slice())...)
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case *IntArray:
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a.Append(gconv.Ints(v.Slice())...)
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case *StrArray:
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a.Append(gconv.Ints(v.Slice())...)
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case *SortedArray:
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a.Append(gconv.Ints(v.Slice())...)
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case *SortedIntArray:
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a.Append(gconv.Ints(v.Slice())...)
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case *SortedStrArray:
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a.Append(gconv.Ints(v.Slice())...)
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default:
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a.Append(gconv.Ints(array)...)
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}
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return a
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}
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// Fill fills an array with num entries of the value <value>,
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// keys starting at the <startIndex> parameter.
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func (a *IntArray) Fill(startIndex int, num int, value int) *IntArray {
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a.mu.Lock()
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defer a.mu.Unlock()
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if startIndex < 0 {
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startIndex = 0
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}
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for i := startIndex; i < startIndex+num; i++ {
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if i > len(a.array)-1 {
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a.array = append(a.array, value)
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} else {
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a.array[i] = value
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}
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}
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return a
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}
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// Chunk splits an array into multiple arrays,
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// the size of each array is determined by <size>.
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// The last chunk may contain less than size elements.
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func (a *IntArray) Chunk(size int) [][]int {
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if size < 1 {
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return nil
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}
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a.mu.RLock()
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defer a.mu.RUnlock()
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length := len(a.array)
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chunks := int(math.Ceil(float64(length) / float64(size)))
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var n [][]int
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for i, end := 0, 0; chunks > 0; chunks-- {
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end = (i + 1) * size
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if end > length {
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end = length
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}
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n = append(n, a.array[i*size:end])
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i++
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}
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return n
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}
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// Pad pads array to the specified length with <value>.
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// If size is positive then the array is padded on the right, or negative on the left.
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// If the absolute value of <size> is less than or equal to the length of the array
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// then no padding takes place.
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func (a *IntArray) Pad(size int, value int) *IntArray {
|
|
a.mu.Lock()
|
|
defer a.mu.Unlock()
|
|
if size == 0 || (size > 0 && size < len(a.array)) || (size < 0 && size > -len(a.array)) {
|
|
return a
|
|
}
|
|
n := size
|
|
if size < 0 {
|
|
n = -size
|
|
}
|
|
n -= len(a.array)
|
|
tmp := make([]int, n)
|
|
for i := 0; i < n; i++ {
|
|
tmp[i] = value
|
|
}
|
|
if size > 0 {
|
|
a.array = append(a.array, tmp...)
|
|
} else {
|
|
a.array = append(tmp, a.array...)
|
|
}
|
|
return a
|
|
}
|
|
|
|
// Rand randomly returns one item from array(no deleting).
|
|
func (a *IntArray) Rand() int {
|
|
a.mu.RLock()
|
|
defer a.mu.RUnlock()
|
|
return a.array[grand.Intn(len(a.array))]
|
|
}
|
|
|
|
// Rands randomly returns <size> items from array(no deleting).
|
|
func (a *IntArray) Rands(size int) []int {
|
|
a.mu.RLock()
|
|
defer a.mu.RUnlock()
|
|
if size > len(a.array) {
|
|
size = len(a.array)
|
|
}
|
|
n := make([]int, size)
|
|
for i, v := range grand.Perm(len(a.array)) {
|
|
n[i] = a.array[v]
|
|
if i == size-1 {
|
|
break
|
|
}
|
|
}
|
|
return n
|
|
}
|
|
|
|
// Shuffle randomly shuffles the array.
|
|
func (a *IntArray) Shuffle() *IntArray {
|
|
a.mu.Lock()
|
|
defer a.mu.Unlock()
|
|
for i, v := range grand.Perm(len(a.array)) {
|
|
a.array[i], a.array[v] = a.array[v], a.array[i]
|
|
}
|
|
return a
|
|
}
|
|
|
|
// Reverse makes array with elements in reverse order.
|
|
func (a *IntArray) Reverse() *IntArray {
|
|
a.mu.Lock()
|
|
defer a.mu.Unlock()
|
|
for i, j := 0, len(a.array)-1; i < j; i, j = i+1, j-1 {
|
|
a.array[i], a.array[j] = a.array[j], a.array[i]
|
|
}
|
|
return a
|
|
}
|
|
|
|
// Join joins array elements with a string <glue>.
|
|
func (a *IntArray) Join(glue string) string {
|
|
a.mu.RLock()
|
|
defer a.mu.RUnlock()
|
|
buffer := bytes.NewBuffer(nil)
|
|
for k, v := range a.array {
|
|
buffer.WriteString(gconv.String(v))
|
|
if k != len(a.array)-1 {
|
|
buffer.WriteString(glue)
|
|
}
|
|
}
|
|
return buffer.String()
|
|
}
|
|
|
|
// CountValues counts the number of occurrences of all values in the array.
|
|
func (a *IntArray) CountValues() map[int]int {
|
|
m := make(map[int]int)
|
|
a.mu.RLock()
|
|
defer a.mu.RUnlock()
|
|
for _, v := range a.array {
|
|
m[v]++
|
|
}
|
|
return m
|
|
}
|
|
|
|
// String returns current array as a string, which implements like json.Marshal does.
|
|
func (a *IntArray) String() string {
|
|
return "[" + a.Join(",") + "]"
|
|
}
|
|
|
|
// MarshalJSON implements the interface MarshalJSON for json.Marshal.
|
|
func (a *IntArray) MarshalJSON() ([]byte, error) {
|
|
a.mu.RLock()
|
|
defer a.mu.RUnlock()
|
|
return json.Marshal(a.array)
|
|
}
|
|
|
|
// UnmarshalJSON implements the interface UnmarshalJSON for json.Unmarshal.
|
|
func (a *IntArray) UnmarshalJSON(b []byte) error {
|
|
if a.mu == nil {
|
|
a.mu = rwmutex.New()
|
|
a.array = make([]int, 0)
|
|
}
|
|
a.mu.Lock()
|
|
defer a.mu.Unlock()
|
|
if err := json.Unmarshal(b, &a.array); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|