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  1. #include <string>
  2. #include <iostream>
  3. #include <stdexcept>
  4.  
  5. class XML{};
  6.  
  7. class XMLParser1 {
  8. public:
  9.     virtual XML Parse(const std::string&) = 0;
  10. };
  11.  
  12. class XMLParser11 : public XMLParser1 {
  13. public:
  14.     XML Parse(const std::string& xml) {
  15.         XML xmlTree; // or std::auto_ptr<XML> xmlTree(new XML); if it must be a pointer
  16.         // ...
  17.         std::cout << "XMLParserll is processing " << xml << '\n';
  18.         // ...
  19.         return xmlTree;
  20.     }
  21. };
  22.  
  23. class XMLParser2 {
  24. public:
  25.     virtual XML Parse(std::istream&) = 0;
  26. };
  27.  
  28. class XMLParser11Adapter : public XMLParser2 {
  29.  public:
  30.     XML Parse(std::istream& xmlStream) {
  31.         if ( !xmlStream ) {
  32.             throw std::runtime_error("XMLParserlldapter::Parse() cannot read from xmlStream");
  33.         }
  34.         std::string xml;
  35.         std::string line;
  36.         while ( getline( xmlStream, line ) ) {
  37.             xml += line + '\n';
  38.         }
  39.     return xmlParser11.Parse(xml);
  40.   }
  41.  private:
  42.     XMLParser11 xmlParser11;  
  43. };
  44.  
  45. int main()
  46. {
  47.     XMLParser11Adapter xmlp;
  48.     xmlp.Parse(std::cin);
  49. }
Success #stdin #stdout 0s 2864KB
comments (?)
stdin
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<hi></hi>
stdout
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XMLParserll is processing <hi></hi>
https://ideone.com/YaaCw
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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