基于OpenHarmony标准系统的C++公共基础类库案例：SafeMap

ohos_shared_library("xxxxx") {  ...  external_deps = [    ...    # 动态库依赖(可选)    "c_utils:utils",    # 静态库依赖(可选)    "c_utils:utilsbase",    # Rust动态库依赖(可选)    "c_utils:utils_rust",  ]  ...}

#include <safe_map.h>

SafeMap();SafeMap(const SafeMap& rhs);

~SafeMap();

void Clear();

void EnsureInsert(const K& key, const V& value);

void Erase(const K& key);

bool Find(const K& key, V& value);

bool FindOldAndSetNew(const K& key, V& oldValue, const V& newValue);

bool Insert(const K& key, const V& value);

bool IsEmpty();

bool Iterate(const SafeMapCallBack& callback);

SafeMap& operator=(const SafeMap& rhs);

V& operator[](const K& key);

int Size();

import("//build/ohos.gni")
group("samples") {  deps = [    "a26_utils_safemap:utils_safemap",    # 添加该行  ]}

a26_utils_safemap├── utils_safemap_sample.cpp      # .cpp源代码├── BUILD.gn              # GN文件

import("//build/ohos.gni")ohos_executable("utils_safemap") {  sources = [ "utils_safemap_sample.cpp" ]  include_dirs = [       "//commonlibrary/c_utils/base/include",      "//commonlibrary/c_utils/base:utils",      "//third_party/googletest:gtest_main",      "//third_party/googletest/googletest/include"  ]  external_deps = [    "c_utils:utils"  ]  part_name = "product_rk3568"  install_enable = true}

# 安装gn工具sudo apt-get install ninja-buildsudo apt install generate-ninja# 规范化BUILD.gngn format BUILD.gn

#include <safe_map.h>       // SafeMap的头文件
// 定义SafeMap变量static OHOS::SafeMap<int, string> m_safemap;

int main(int argc, char **argv){    OHOS::ThreadPool threads("name_rwlock_threads");    string str_name;  ......    threads.SetMaxTaskNum(128);    threads.Start(4);    ......}

// 开启子线程，使用EnsureInsert插入元素str_name = "Thread_EnsureInsert";auto task_ensure_insert = std::bind(map_ensure_insert, str_name);threads.AddTask(task_ensure_insert);
// 开启子线程，使用Insert插入元素str_name = "Thread_Insert";auto task_insert = std::bind(map_insert, str_name);threads.AddTask(task_insert);
// 开启子线程，使用erase删除元素str_name = "Thread_Erase";auto task_erase = std::bind(map_erase, str_name);threads.AddTask(task_erase);
// 开启子线程，使用FindOldAndSetNew替换元素的值str_name = "Thread_FindOldAndSetNew";auto task_findold_and_setnew = std::bind(map_findold_and_setnew, str_name);threads.AddTask(task_findold_and_setnew);
// 设置结束，并等待结束threads.Stop();cout << "Threads Stop" << endl;

void map_ensure_insert(const string& name){    int key = 0;    string value = "";        for (int i = 0; i < (sizeof(m_map1_insert) / sizeof(struct MapInfo)); i++) {        key = m_map1_insert[i].key;        value = m_map1_insert[i].str;        m_safemap.EnsureInsert(key, value);        cout << name << ": insert successful and key = " << key << " and value = " << value << endl;        sleep(1);    }}

void map_insert(const string& name){    int key = 0;    string value = "";        for (int i = 0; i < (sizeof(m_map2_insert) / sizeof(struct MapInfo)); i++) {        key = m_map2_insert[i].key;        value = m_map2_insert[i].str;        if (m_safemap.Insert(key, value) == false) {            cout << name << ": insert failed and key = " << to_string(key) << " and value = " << value << endl;        } else {            cout << name << ": insert successful and key = " << to_string(key) << " and value = " << value << endl;        }        sleep(1);    }}

void map_erase(const string& name){    int key = 0;    string value = "";        for (int i = 0; i < (sizeof(m_map2_insert) / sizeof(struct MapInfo)); i++) {        key = m_map2_insert[i].key;        m_safemap.Erase(key);        cout << name << ": Erase successful and key = " << to_string(key) << endl;        sleep(1);    }}

void map_findold_and_setnew(const string& name){    int key = 0;    string old_value = "";    string new_value = "";        for (int i = 0; i < (sizeof(m_map1_insert) / sizeof(struct MapInfo)); i++) {        key = m_map1_reset[i].key;        old_value = "";        new_value = m_map1_reset[i].str;                if (m_safemap.FindOldAndSetNew(key, old_value, new_value) == false) {            cout << name << ": FindOldAndSetNew failed and key = " << to_string(key) << " and old_value = " << old_value << endl;        } else {            cout << name << ": FindOldAndSetNew successful and key = " << to_string(key)                 << " and old_value = " << old_value << " and new_value = " << new_value << endl;        }                sleep(1);    }}

void map_iterate_print(const int key, string& value){    cout << "key = " << to_string(key) << ", value = " << value << endl;}
int main(int argc, char *argv[]){    ......    cout << "SafeMap Iterate: " << endl;    m_safemap.Iterate(map_iterate_print);    ......}

void map_find_print(){    int key = 0;    string value = "";        for (int i = 0; i < (sizeof(m_map1_insert) / sizeof(struct MapInfo)); i++) {        key = m_map1_insert[i].key;        value = "";                if (m_safemap.Find(key, value)) {            cout << "key = " << to_string(key) << ", value = " << value << endl;        }    }        for (int i = 0; i < (sizeof(m_map2_insert) / sizeof(struct MapInfo)); i++) {        key = m_map2_insert[i].key;        value = "";                if (m_safemap.Find(key, value)) {            cout << "key = " << to_string(key) << ", value = " << value << endl;        }    }}

int main(int argc, char *argv[]){    ......    cout << "SafeMap Clear" << endl;    m_safemap.Clear();    cout << "SafeMap IsEmpty: " << m_safemap.IsEmpty() << endl;    ......}

hb build -f

# utils_safemapThread_EnsureInsert: insert successful and key = 1 and value = aaaThread_Erase: Erase successful and key = Thread_FindOldAndSetNew: FindOldAndSetNew successful and key = 1 and old_value = aaa and new_value = abc101Thread_Insert: insert successful and key = 101 and value = 111Thread_EnsureInsert: insert successful and key = Thread_FindOldAndSetNew: FindOldAndSetNew successful and key = 2 and old_value = bbb and new_value = bcdThread_Insert: insert successful and key = 102 and value = 2222 and value = bbb
Thread_Erase: Erase successful and key = 102Thread_EnsureInsert: insert successful and key = 3 and value = cccThread_FindOldAndSetNew: FindOldAndSetNew successful and key = 3 and old_value = ccc and new_value = cdeThread_Insert: insert successful and key = 103 and value = 333Thread_Erase: Erase successful and key = 103Thread_EnsureInsert: insert successful and key = 4 and value = dddThread_Insert: insert successful and key = 104Thread_FindOldAndSetNew and value = : FindOldAndSetNew successful and key = 4444 and old_value = ddd and new_value = def
Thread_Erase: Erase successful and key = 104Thread_EnsureInsert: insert successful and key = 5 and value = eeeThread_Insert: insert successful and key = 105 and value = 555Thread_FindOldAndSetNew: FindOldAndSetNew successful and key = 5 and old_value = eee and new_value = efgThread_Erase: Erase successful and key = 105Thread_EnsureInsert: insert successful and key = 6 and value = fffThread_FindOldAndSetNew: FindOldAndSetNew successful and key = 6 and old_value = fff and new_value = fghThread_Insert: insert successful and key = 106 and value = 666Thread_Erase: Erase successful and key = 106Thread_EnsureInsert: insert successful and key = 7 and value = gggThread_FindOldAndSetNew: FindOldAndSetNew successful and key = 7 and old_value = ggg and new_value = ghiThread_Erase: Erase successful and key = 107Thread_Insert: insert successful and key = 107 and value = 777Thread_EnsureInsert: insert successful and key = 8 and value = hhhThread_FindOldAndSetNew: FindOldAndSetNew successful and key = 8 and old_value = hhh and new_value = hijThread_Erase: Erase successful and key = 108Thread_Insert: insert successful and key = 108 and value = 888Thread_EnsureInsert: insert successful and key = 9 and value = iiiThread_FindOldAndSetNew: FindOldAndSetNew successful and key = 9 and old_value = iii and new_value = ijkThread_Erase: Erase successful and key = 109Thread_Insert: insert successful and key = 109 and value = 999Thread_EnsureInsert: insert successful and key = 10 and value = jjjThread_FindOldAndSetNew: FindOldAndSetNew successful and key = 10 and old_value = jjj and new_value = jklThread_Erase: Erase successful and key = 110Thread_Insert: insert successful and key = 110 and value = 000Threads StopSafeMap Iterate:key = 1, value = abckey = 2, value = bcdkey = 3, value = cdekey = 4, value = defkey = 5, value = efgkey = 6, value = fghkey = 7, value = ghikey = 8, value = hijkey = 9, value = ijkkey = 10, value = jklkey = 108, value = 888key = 109, value = 999key = 110, value = 000SafeMap Find:key = 1, value = abckey = 2, value = bcdkey = 3, value = cdekey = 4, value = defkey = 5, value = efgkey = 6, value = fghkey = 7, value = ghikey = 8, value = hijkey = 9, value = ijkkey = 10, value = jklkey = 108, value = 888key = 109, value = 999key = 110, value = 000SafeMap ClearSafeMap IsEmpty: 1#