How to use sfinae for selecting constructors?

You can add a defaulted type argument to the template:

template <int otherN, typename = typename std::enable_if<otherN >= N>::type>
explicit A(A<otherN> const &);

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  6. What is “Expression SFINAE”?
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  8. Selecting a member function using different enable_if conditions
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  11. Detecting constexpr with SFINAE
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  17. Why is the std::initializer_list constructor preferred when using a braced initializer list?
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  30. What is the partial ordering procedure in template deduction
  31. Why is std::function not equality comparable?
  32. Scope of variables in if statements
  33. Which headers in the C++ standard library are guaranteed to include another header?
  34. Outputting Date and Time in C++ using std::chrono
  35. What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack
  36. Which Boost features overlap with C++11?
  37. smart pointers and arrays
  38. Does a C++11 range-based for loop condition get evaluated every cycle?
  39. Constant expression initializer for static class member of type double
  40. std::to_string – more than instance of overloaded function matches the argument list
  41. Which std::async implementations use thread pools?
  42. error: use of deleted function
  43. Doing a static_assert that a template type is another template
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  45. Extending temporary’s lifetime through rvalue data-member works with aggregate, but not with constructor, why?
  46. cc1plus: error: unrecognized command line option “-std=c++11” with g++
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