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Showing content from https://cplusplus.com/reference/type_traits/remove_const/ below:

class template

<type_traits>

template <class T> struct remove_const;

Remove const qualification

The transformed type is aliased as member type remove_const::type.

If T is const-qualified, this is the same type as T but with its const-qualification removed. Otherwise, it is T unchanged.

Notice that this class merely obtains a type using another type as model, but it does not transform values or objects between those types. To explicitly remove the const-qualifier of an object, const_cast can be used.

T

A type.

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// remove_const example
#include <iostream>
#include <type_traits>

int main() {
  typedef const char cc;
  std::remove_const<cc>::type a;             // char a
  std::remove_const<const char*>::type b;    // const char* b
  std::remove_const<char* const>::type c;    // char* c

  a = 'x';
  b = "remove_const";
  c = new char[10];

  std::cout << b << std::endl;

  return 0;
}

add_const

Add const qualification (class template)

remove_cv

Remove cv qualification (class template)

remove_reference

Remove reference (class template)

remove_pointer

Remove pointer (class template)

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