接收字符串并使用它来调用方法C++

您可以实现从命令字符串到使用a处理该命令的函数的实现的映射unordered_map.

示例实现可以如下工作:

// A function handler takes its arguments as strings and returns some sort of result
// that can be returned to the user. 
using CommandHandler = std::function const&)>

// various handers for command requests
Result handle_print(std::vector const& args);
Result handle_delete(std::vector const& args);
Result handle_add(std::vector const& args);
Result handle_version(std::vector const& args);

// the table that holds our commands
std::unordered_map command_table = {
    {"print", handle_print},
    {"delete", handle_delete},
    {"add", handle_add},
    {"version", handle_version},
};

// take your json doucment, extract the first value as the command, and put the rest into an arg array: 

void handle_request(Connection& connection, json const& request)
{
    std::string cmd = root["A"];
    std::vector args;
    // parse the rest of your arguments into an array here. 

    if(command_table.count(cmd))
    {
        // command is valid
        auto& handler = command_table[cmd];
        auto result = handler(args);
        send_result(connection, result);
    }
    else
    {
        // send bad command error or something

        send_bad_command(connection);
    }
}