sizeof is a compile-time operator to determine the size of a data type in bytes.


#include <iostream>



int main()

{

  std::cout

    << "bool size: " << sizeof(bool) << '\n'

    << "int size : " << sizeof(int) << '\n';

}

sizeof being a compile-time operator

Because sizeof is a compile-time operator, one can use on it:

Download the Qt Creator project 'CppSizeof' (zip)


int main()

{

  static_assert(sizeof("")     == 1,"The sizeof of a string is its number of characters + 1");

  static_assert(sizeof("1")    == 2,"The sizeof of a string is its number of characters + 1");

  static_assert(sizeof("12")   == 3,"The sizeof of a string is its number of characters + 1");

  static_assert(sizeof("123")  == 4,"The sizeof of a string is its number of characters + 1");

  static_assert(sizeof("1234") == 5,"The sizeof of a string is its number of characters + 1");

}

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(C++) sizeof

sizeof being a compile-time operator