Which standard wording tells us that ref-to-const temporary lifetime extension only “works once”?

by

You’re almost right. This behaviour actually comes from the function call specifically, not because of any sort of “only works once” rule.

Here’s the wording for the whole lifetime extension “feature”, with the pertinent rule emphasised in bold:

[C++11: 12.2/5]: [..] The temporary to which the reference is bound or the temporary that is the complete object of a subobject to which the reference is bound persists for the lifetime of the reference except:

  • [..]
  • A temporary bound to a reference parameter in a function call (5.2.2) persists until the completion of the full-expression containing the call.
  • [..]

More Related Contents:

  1. Why do I keep getting an "expected expression error" in my While Loop? [closed]
  2. How would i reject invalid inputs in my code?
  3. What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
  4. Are std::vector elements guaranteed to be contiguous?
  5. How does C++ handle &&? (Short-circuit evaluation) [duplicate]
  6. Variable Length Array (VLA) in C++ compilers
  7. Why do constant expressions have an exclusion for undefined behavior?
  8. Purpose of returning by const value? [duplicate]
  9. Copying a Polymorphic object in C++
  10. Rotate an image without cropping in OpenCV in C++
  11. Running my program says “bash: ./program Permission denied” [closed]
  12. C/C++ header and implementation files: How do they work?
  13. Function signature-like expressions as C++ template arguments
  14. Move constructor for std::mutex
  15. Elegantly call C++ from C
  16. Statically declared 2-D array C++ as data member of a class [duplicate]
  17. C++ template copy constructor on template class
  18. Programmatically reading a web page
  19. I want to convert std::string into a const wchar_t *
  20. Difference between using character pointers and character arrays
  21. How to read groups of integers from a file, line by line in C++
  22. What do I need to do before deleting elements in a vector of pointers to dynamically allocated objects?
  23. new() without delete() is Undefined Behavior or merely Memory Leak? [duplicate]
  24. Sell me const-correctness
  25. sizeof(struct) returns unexpected value
  26. array decay to pointer and overload resolution
  27. stoi and std::to_string on mingw 4.7.1 [duplicate]
  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