c++使用map保存成员函数地址
2024-09-06 03:50:45
note
- 本基于c++11介绍一种使用map保存成员函数地址
- 可避免使用 if 和 switch
- 配置灵活 方便，
- 代码维护效率高
结果：
范例开始
头文件包含
#include <iostream>
#include <map>
#include <algorithm>
必要类型前置声明
class pop_input_ui;
/// 前置声明
typedef void (pop_input_ui::*psend_cmd)();
/// ----------------------------------------------------------------------------
/// @brief: 用于map保存成员函数地址
/// ----------------------------------------------------------------------------
struct st_send_cmd_config_
{
psend_cmd psend_cmd_ = nullptr;
void zero_()
{
psend_cmd_ = nullptr;
}
st_send_cmd_config_()
{
zero_();
}
};
using send_cmd_config = st_send_cmd_config_;
/// 用于保存成员函数
using map_send_cmd = std::map<int , send_cmd_config>;
类的完整定义
/// ----------------------------------------------------------------------------
/// @brief: 通用弹窗
/// ----------------------------------------------------------------------------
class pop_input_ui
{
public:
/// ----------------------------------------------------------------------------
/// @brief: 发送类型枚举
/// ----------------------------------------------------------------------------
enum en_send_type
{
ksend_type_01 = 1 ,
ksend_type_02 = 2 ,
ksend_type_03 = 3 ,
};
/// ----------------------------------------------------------------------------
/// @brief: 构造函数
/// ----------------------------------------------------------------------------
pop_input_ui()
{
/// ----------------------------------------------------------------------------
/// @brief: 向map中添加item
/// ----------------------------------------------------------------------------
auto map_insert = [&](int map_key, psend_cmd pfunc)
{
send_cmd_config config;
config.psend_cmd_ = pfunc;
std::pair<int, send_cmd_config> map_pair = {map_key, config};
map_send_cmd_.insert(map_pair);
};
/// ----------------------------------------------------------------------------
/// 构建map, 将成员函数地址保存
map_insert(ksend_type_01, &pop_input_ui::send_cmd01_);
map_insert(ksend_type_02, &pop_input_ui::send_cmd02_);
map_insert(ksend_type_03, &pop_input_ui::send_cmd03_);
}
/// ----------------------------------------------------------------------------
/// @brief: 发送命令
/// ----------------------------------------------------------------------------
void send_cmd_(const en_send_type& type)
{
auto find_send_type = map_send_cmd_.find(type);
if (find_send_type == map_send_cmd_.end())
return ;
/// 找到了，则调用
if (nullptr == find_send_type->second.psend_cmd_)
return;
(this->*find_send_type->second.psend_cmd_)();
}
private:
/// ----------------------------------------------------------------------------
/// @brief: 发送cmd02
/// ----------------------------------------------------------------------------
void send_cmd01_()
{
cout << "\n send cmd 01\n";
}
/// ----------------------------------------------------------------------------
/// @brief: 发送cmd02
/// ----------------------------------------------------------------------------
void send_cmd02_()
{
cout << "\n send cmd 02\n";
}
/// ----------------------------------------------------------------------------
/// @brief: 发送cmd03
/// ----------------------------------------------------------------------------
void send_cmd03_()
{
cout << "\n send cmd 03\n";
}
private:
/// 用于保存成员函数地址
map_send_cmd map_send_cmd_;
};
main 函数调用
int main()
{
/// 调用范例
pop_input_ui pop_ui;
/// 调用发送命令01
pop_ui.send_cmd_(pop_input_ui::ksend_type_01);
/// 发送命令02
pop_ui.send_cmd_(pop_input_ui::ksend_type_02);
/// 发送命令03
pop_ui.send_cmd_(pop_input_ui::ksend_type_03);
system("pause");
return 0;
}
完整源码
#include <iostream>
#include <map>
#include <algorithm>
using namespace std;
class pop_input_ui;
/// 前置声明
typedef void (pop_input_ui::*psend_cmd)();
/// ----------------------------------------------------------------------------
/// @brief: 用于map保存成员函数地址
/// ----------------------------------------------------------------------------
struct st_send_cmd_config_
{
psend_cmd psend_cmd_ = nullptr;
void zero_()
{
psend_cmd_ = nullptr;
}
st_send_cmd_config_()
{
zero_();
}
};
using send_cmd_config = st_send_cmd_config_;
/// 用于保存成员函数
using map_send_cmd = std::map<int , send_cmd_config>;
/// ----------------------------------------------------------------------------
/// @brief: 通用弹窗
/// ----------------------------------------------------------------------------
class pop_input_ui
{
public:
/// ----------------------------------------------------------------------------
/// @brief: 发送类型枚举
/// ----------------------------------------------------------------------------
enum en_send_type
{
ksend_type_01 = 1 ,
ksend_type_02 = 2 ,
ksend_type_03 = 3 ,
};
/// ----------------------------------------------------------------------------
/// @brief: 构造函数
/// ----------------------------------------------------------------------------
pop_input_ui()
{
/// ----------------------------------------------------------------------------
/// @brief: 向map中添加item
/// ----------------------------------------------------------------------------
auto map_insert = [&](int map_key, psend_cmd pfunc)
{
send_cmd_config config;
config.psend_cmd_ = pfunc;
std::pair<int, send_cmd_config> map_pair = {map_key, config};
map_send_cmd_.insert(map_pair);
};
/// ----------------------------------------------------------------------------
/// 构建map, 将成员函数地址保存
map_insert(ksend_type_01, &pop_input_ui::send_cmd01_);
map_insert(ksend_type_02, &pop_input_ui::send_cmd02_);
map_insert(ksend_type_03, &pop_input_ui::send_cmd03_);
}
/// ----------------------------------------------------------------------------
/// @brief: 发送命令
/// ----------------------------------------------------------------------------
void send_cmd_(const en_send_type& type)
{
auto find_send_type = map_send_cmd_.find(type);
if (find_send_type == map_send_cmd_.end())
return ;
/// 找到了，则调用
if (nullptr == find_send_type->second.psend_cmd_)
return;
(this->*find_send_type->second.psend_cmd_)();
}
private:
/// ----------------------------------------------------------------------------
/// @brief: 发送cmd02
/// ----------------------------------------------------------------------------
void send_cmd01_()
{
cout << "\n send cmd 01\n";
}
/// ----------------------------------------------------------------------------
/// @brief: 发送cmd02
/// ----------------------------------------------------------------------------
void send_cmd02_()
{
cout << "\n send cmd 02\n";
}
/// ----------------------------------------------------------------------------
/// @brief: 发送cmd03
/// ----------------------------------------------------------------------------
void send_cmd03_()
{
cout << "\n send cmd 03\n";
}
private:
/// 用于保存成员函数地址
map_send_cmd map_send_cmd_;
};
int main()
{
/// 调用范例
pop_input_ui pop_ui;
/// 调用发送命令01
pop_ui.send_cmd_(pop_input_ui::ksend_type_01);
/// 发送命令02
pop_ui.send_cmd_(pop_input_ui::ksend_type_02);
/// 发送命令03
pop_ui.send_cmd_(pop_input_ui::ksend_type_03);
system("pause");
return 0;
}
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