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  1. #include <iostream>
  2. #include <iterator>
  3.  
  4. template<class T>
  5. class Base
  6. {
  7. protected:
  8.     std::string mFoo;
  9.  
  10. public:
  11.     // note: *something* virtual required for dynamic_cast
  12.     virtual ~Base() {};
  13.  
  14.     T& withFoo(const std::string& foo)
  15.     {
  16.         mFoo = foo;
  17.         return dynamic_cast<T&>(*this);
  18.     }
  19. };
  20.  
  21. class Derived : public Base<Derived>
  22. {
  23. protected:
  24.     std::string mBar;
  25.  
  26. public:
  27.     Derived& withBar(std::string bar)
  28.     {
  29.         mBar = bar;
  30.         return *this;
  31.     }
  32.  
  33.     void doOutput()
  34.     {
  35.         std::cout << "Foo is " << mFoo
  36.                   << ".  Bar is " << mBar << "."
  37.                   << std::endl;
  38.     }
  39. };
  40.  
  41.  
  42. int main()
  43. {
  44.     Derived d;
  45.     d.withFoo("foo").withBar("bar");
  46.     d.doOutput();
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
Standard input is empty
stdout 
Foo is foo.  Bar is bar.
https://ideone.com/ftLrP7
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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