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  1. #include <iostream>
  2.  
  3. void doSomething (int x) {std::cout << "Do something with " << x << std::endl;}
  4.  
  5. struct Base {
  6.     virtual int foo() const {return foo(std::false_type());}
  7.     virtual int goo() const {return goo(std::false_type());}
  8.     virtual int hoo() const {return hoo(std::false_type());}
  9.  
  10.     void noTemplatePattern() const { doIt (std::false_type()); }
  11.     void templatePattern() const { doIt (std::true_type()); }
  12.  
  13. private:
  14.     template <typename T>
  15.     void doIt (T t) const {
  16.         // Code A
  17.         if (foo(t) < 6) {
  18.             // Code B
  19.         }
  20.         doSomething (goo(t));
  21.         // Code C
  22.         if (hoo(t) > 10) {
  23.             // Code D
  24.         }
  25.     }
  26.     int foo(std::false_type) const {return 5;}
  27.     int goo(std::false_type) const {return 6;}
  28.     int hoo(std::false_type) const {return 7;}
  29.     int foo(std::true_type) const {return foo();}
  30.     int goo(std::true_type) const {return goo();}
  31.     int hoo(std::true_type) const {return hoo();}
  32. };
  33.  
  34. struct Derived : Base {
  35.     virtual int foo() const override {return 12;}
  36.     virtual int goo() const override {return 13;}
  37.     virtual int hoo() const override {return 14;}
  38. };
  39.  
  40. int main() {
  41.     Derived d;
  42.     d.noTemplatePattern();
  43.     d.templatePattern();
  44. }
  45.  
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
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Standard input is empty
stdout
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Do something with 6
Do something with 13
https://ideone.com/Tl4jEZ
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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