Overload resolution failure when streaming object via implicit conversion to string

by

14.8.1/4 in C++98

Implicit conversions (clause 4) will be performed on a function argument to convert it to the type of the corresponding function parameter if the parameter type contains no template-parameters that participate in template argument deduction.

Here you would like an instantiation of

template <class charT, class traits, class Allocator>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>&,
               const basic_string<charT, traits, Allocator>&);

to be deduced without providing explicitly any template arguments. So all of the arguments contain a template-parameter that participates in the template argument deduction and thus none of them can get its value from an implicit conversion.

More Related Contents:

  1. Does my overload of operator
  2. Implicit conversion when overloading operators for template classes
  3. overloading friend operator
  4. Replace part of a string with another string
  5. Operator overloading : member function vs. non-member function?
  6. How is std::string implemented?
  7. Why is the destructor of a future returned from `std::async` blocking?
  8. Should I use std::function or a function pointer in C++?
  9. Append an int to a std::string [duplicate]
  10. Overloading ++ for both pre and post increment
  11. Why would one replace default new and delete operators?
  12. How std::bind works with member functions
  13. What is the meaning of “operator bool() const”
  14. How to overload the operator++ in two different ways for postfix a++ and prefix ++a?
  15. Rationale of enforcing some operators to be members
  16. return value of operator overloading in C++
  17. do I need to close a std::fstream? [duplicate]
  18. Why is “operator void” not invoked with cast syntax?
  19. How can I use Standard Library (STL) classes in my dll interface or ABI?
  20. Why does printf(“%f”,0); give undefined behavior?
  21. How to truncate a file while it is open with fstream
  22. Multiple implicit conversions on custom types not allowed?
  23. cc1plus: error: unrecognized command line option “-std=c++11” with g++
  24. std::lexical_cast – is there such a thing?
  25. Does clearing a vector affect its capacity?
  26. std::forward_list and std::forward_list::push_back
  27. Sorting a vector of objects by a property of the object
  28. std::ofstream, check if file exists before writing
  29. How to differentiate (when overloading) between prefix and postfix forms of operator++? (C++)
  30. std::getline() reads carriage return \r into the string, how to avoid that?

Leave a Comment