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  1. #include <iostream>
  2. #include <sstream>
  3. #include <iterator>
  4. #include <vector>
  5. #include <string>
  6. #include <unordered_map>
  7. #include <memory>
  8.  
  9.  
  10. struct command {
  11.  
  12.    using args_type = std::vector<std::string>;
  13.  
  14.    virtual void exec(args_type const& args) const = 0;
  15.  
  16.    virtual ~command() {}
  17. };
  18.  
  19. struct read_file : command {
  20.  
  21.    virtual void exec(args_type const& args) const override {
  22.       std::clog << "'read_file'";
  23.       for (auto const& arg : args) {
  24.          std::clog << ' ' << arg;
  25.       }
  26.       std::clog << std::endl;
  27.    }
  28. };
  29.  
  30. struct write_file : command {
  31.  
  32.    virtual void exec(args_type const& args) const override {
  33.       std::clog << "'write_file'";
  34.       for (auto const& arg : args) {
  35.          std::clog << ' ' << arg;
  36.       }
  37.       std::clog << std::endl;
  38.    }
  39. };
  40.  
  41. using command_ptr = std::unique_ptr<command>;
  42. using command_map = std::unordered_map<std::string, command_ptr>;
  43.  
  44.  
  45. int main() {
  46.    // ассоциативный массив команд
  47.    command_map commandMap;
  48.    commandMap["read_file" ] = command_ptr(new read_file);
  49.    commandMap["write_file"] = command_ptr(new write_file);
  50.  
  51.    for (std::string line; std::getline(std::cin, line); ) {
  52.       std::istringstream iss(line);
  53.  
  54.       std::string commandName;
  55.       iss >> commandName;
  56.  
  57.       auto const it = commandMap.find(commandName);
  58.       if (it != std::end(commandMap)) {
  59.          command::args_type const commandArgs(
  60.                std::istream_iterator<std::string>{iss}
  61.              , std::istream_iterator<std::string>{});
  62.  
  63.          it->second->exec(commandArgs);
  64.       } else {
  65.          std::cerr << "'" << commandName << "' - unrecognized command" << std::endl;
  66.       }
  67.    }
  68. }
  69.  
Success #stdin #stdout #stderr 0s 3440KB
comments (?)
stdin
copy 
read_file someFile andOption
read someOption
write_file someFile
write
stdout
copy 
Standard output is empty
stderr
copy 
'read_file' someFile andOption
'read' - unrecognized command
'write_file' someFile
'write' - unrecognized command
https://ideone.com/H2Jgbk
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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