How do you ‘realloc’ in C++?

by

Use ::std::vector!

Type* t = (Type*)malloc(sizeof(Type)*n) 
memset(t, 0, sizeof(Type)*m)

becomes

::std::vector<Type> t(n, 0);

Then

t = (Type*)realloc(t, sizeof(Type) * n2);

becomes

t.resize(n2);

If you want to pass pointer into function, instead of 

Foo(t)

use

Foo(&t[0])

It is absolutely correct C++ code, because vector is a smart C-array.

More Related Contents:

  1. Is “delete this” allowed in C++?
  2. How should I write ISO C++ Standard conformant custom new and delete operators?
  3. How does delete[] know it’s an array?
  4. Why would one replace default new and delete operators?
  5. overloading new/delete
  6. delete[] an array of objects
  7. When to use new and delete
  8. Why there is no placement delete expression in C++?
  9. Why doesn’t delete destroy anything?
  10. How serious is the new/delete operator mismatch error?
  11. C++ delete – It deletes my objects but I can still access the data?
  12. delete vs delete[] operators in C++
  13. Is it safe to delete a NULL pointer?
  14. Calling delete on variable allocated on the stack
  15. delete vs delete[] [duplicate]
  16. Why doesn’t delete set the pointer to NULL?
  17. Meaning of = delete after function declaration
  18. Deleting a pointer to const (T const*)
  19. Is the pointer guaranteed to preserve its value after `delete` in C++?
  20. Deleting a pointer in C++
  21. What are uses of the C++ construct “placement new”?
  22. Why is there no reallocation functionality in C++ allocators?
  23. Does new[] call default constructor in C++?
  24. Is it safe to realloc memory allocated with new?
  25. new() without delete() is Undefined Behavior or merely Memory Leak? [duplicate]
  26. Creating an object: with or without `new` [duplicate]
  27. Call destructor and then constructor (resetting an object)
  28. Will new operator return NULL? [duplicate]
  29. Calling delete on NULL pointers – C++03 vs C++11
  30. Is the whole object freed with a non-virtual destructor and a Base class pointer?

Leave a Comment