What is the reason for not being able to deduce array size from initializer-string in member variable?

by

The reason is that you always have the possibility to override an in-class initializer list in the constructor. So I guess that in the end, it could be very confusing.

struct Foo
{
   Foo() {} // str = "test\0";

   // Implementing this is easier if I can clearly see how big `str` is, 
   Foo() : str({'a','b', 'c', 'd'}) {} // str = "abcd0"
   const char str[] = "test";
};

Notice that replacing const char with static constexpr char works perfectly, and probably it is what you want anyway.

More Related Contents:

  1. What is a C++11 extension [-Wc++11-extensions]
  2. Using generic std::function objects with member functions in one class
  3. How can I sort two vectors in the same way, with criteria that uses only one of the vectors?
  4. Does const mean thread-safe in C++11?
  5. How to implement make_unique function in C++11? [duplicate]
  6. C++0x lambda capture by value always const?
  7. ‘colon’ and ‘auto’ in for loop c++? need some help understanding the syntax
  8. Computing length of a C string at compile time. Is this really a constexpr?
  9. Detecting constexpr with SFINAE
  10. Does moving leave the object in a usable state?
  11. C++11 lambda implementation and memory model
  12. How to construct std::array object with initializer list? [duplicate]
  13. C++11: Compile Time Calculation of Array
  14. Is it possible to initialize std::vector over already allocated memory?
  15. std::bind overload resolution
  16. So why is i = ++i + 1 well-defined in C++11?
  17. Forwarding all constructors in C++0x
  18. How can I have multiple parameter packs in a variadic template?
  19. What is the difference between C++03 `throw()` specifier and C++11 `noexcept`?
  20. When is std::chrono epoch?
  21. Using char16_t and char32_t in I/O
  22. constexpr initialization of array to sort contents
  23. What am I allowed to do with a static, constexpr, in-class initialized data member?
  24. Futures vs. Promises
  25. How to get the precision of high_resolution_clock?
  26. STL algorithms: Why no additional interface for containers (additional to iterator pairs)?
  27. c++11 Thread class how to use a class member function
  28. Does C++11 unique_ptr and shared_ptr able to convert to each other’s type?
  29. Proper way to receive a lambda as parameter by reference
  30. When to use functors over lambdas

Leave a Comment