How can std::unique_ptr have no size overhead?

by

The reason is that the typename _Dp = default_delete<_Tp> is an empty class and the tuple template employs empty base class optimization.

If you instantiate the unique_ptr with a non-default delete, you should see the size increase.

More Related Contents:

  1. C++ Need help for a homework program that reads in a list of doubles from a file and add a string to each double
  2. How to enforce move semantics when a vector grows?
  3. Using generic std::function objects with member functions in one class
  4. Is signed integer overflow still undefined behavior in C++?
  5. Move capture in lambda
  6. Reusing a moved container?
  7. Error “undefined reference to ‘std::cout'”
  8. ‘colon’ and ‘auto’ in for loop c++? need some help understanding the syntax
  9. Computing length of a C string at compile time. Is this really a constexpr?
  10. Detecting constexpr with SFINAE
  11. Constexpr Math Functions
  12. Does moving leave the object in a usable state?
  13. Copy constructor is not inherited
  14. C++11 lambda implementation and memory model
  15. Is it possible to “store” a template parameter pack without expanding it?
  16. C++11: Compile Time Calculation of Array
  17. Why do auto and template type deduction differ for braced initializers?
  18. What is the meaning of auto when using C++ trailing return type?
  19. Does this code from “The C++ Programming Language” 4th edition section 36.3.6 have well-defined behavior?
  20. C++11 range based loop: How does it really work
  21. std::function and std::bind: what are they, and when should they be used?
  22. constexpr vs. static const: Which one to prefer?
  23. How do shared pointers work?
  24. C++11 std::threads vs posix threads
  25. Why isn’t std::array::size static?
  26. How to know underlying type of class enum?
  27. In lambda functions syntax, what purpose does a ‘capture list’ serve?
  28. Multiple “could not be resolved” problems using Eclipse with minGW
  29. c++11 std::async doesn’t work in mingw
  30. Explicit Return Type of Lambda

Leave a Comment