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Sep 19th, 2019
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C++ 0.43 KB | None | 0 0
  1. #include <type_traits>
  2.  
  3. class MyHardClass
  4. {
  5.     MyHardClass() = delete;
  6. };
  7.  
  8. class A
  9. {
  10. public:
  11.     float a(const MyHardClass& x) { return 0.0; }
  12. };
  13.  
  14. int main()
  15. {
  16.     A a;
  17.     std::result_of_t<decltype(&A::a)(A&, const MyHardClass&)> x = 1;
  18.     static_assert(std::is_same<decltype(x), float>::value);
  19.  
  20.     decltype(a.a(std::declval<MyHardClass>())) y = 1;
  21.     static_assert(std::is_same<decltype(y), float>::value);
  22. }
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