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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<template<class, class...> class C, class T, class... OtherTs>
  5. T A_helper_valueType(C<T, OtherTs...>&&);
  6.  
  7. template <class T>
  8. struct A {
  9. 	void printSize() const { cout << sizeof(decltype(A_helper_valueType(std::declval<T>()))); }
  10. };
  11.  
  12. template <typename A>
  13. struct X{
  14. };
  15.  
  16. int main() {
  17. 	A<X<char>>{}.printSize();
  18. 	return 0;
  19. }
Success #stdin #stdout 0.01s 5532KB
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https://ideone.com/rqqBWe
language:
C++ 4.3.2 (gcc-4.3.2)
created:
3 years ago
visibility:
public

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