C++ implicit conversions

by

I think the answer from sharptooth is precise. The C++ Standard (SC22-N-4411.pdf) section 12.3.4 titled ‘Conversions’ makes it clear that only one implicit user-defined conversion is allowed.

1 Type conversions of class objects can be specified by
constructors and by conversion
functions. These
conversions are called user-defined conversions and are used
for implicit type conversions (Clause
4), for
initialization (8.5), and for explicit type conversions (5.4,
5.2.9).

2 User-defined conversions are applied only where they are
unambiguous (10.2, 12.3.2).
Conversions obey the
access control rules (Clause 11). Access control is applied after
ambiguity resolution (3.4).

3 [ Note: See 13.3 for a discussion of the use of conversions
in function calls as well as examples
below. —end
note ]

4 At most one user-defined conversion (constructor or conversion
function) is implicitly applied to a
single
value.

More Related Contents:

  1. Unsigned Number displays different results when a zero is appended to the number [duplicate]
  2. Why do I need to have this pointer as an attribute?
  3. Difficulties on atributting a array to another [closed]
  4. How to fix this C++ program?
  5. Odd error: ‘FILE *’ differs in levels of indirection from ‘FILE’ [closed]
  6. What is a “span” and when should I use one?
  7. tellg() function give wrong size of file?
  8. How to check if a CPU supports the SSE3 instruction set?
  9. How does std::forward work? [duplicate]
  10. C++11 features in Visual Studio 2012
  11. Get the compiler options from a compiled executable?
  12. Are all integer values perfectly represented as doubles? [duplicate]
  13. Why unsigned int 0xFFFFFFFF is equal to int -1?
  14. long long int vs. long int vs. int64_t in C++
  15. Prevent class inheritance in C++
  16. C/C++: Optimization of pointers to string constants
  17. Proper way to copy C strings
  18. Are static variables in a base class shared by all derived classes?
  19. How to declare constexpr extern?
  20. Do all pointers have the same size in C++?
  21. Alternative function in iostream.h for getch() of conio.h?
  22. do I need to close a std::fstream? [duplicate]
  23. Returning a const reference to an object instead of a copy
  24. cmake include header into every source file
  25. This regex doesn’t work in c++
  26. Virtual tables and memory layout in multiple virtual inheritance
  27. Get base address of process
  28. C++ Build Systems – What to use? [closed]
  29. When to use const char * and when to use const char []
  30. How to find substring from string?

Leave a Comment