<pre> //====================== start of sample.cpp ========================== class User { public: struct Region { short country_code; short city_code; static char* city_name; }; const char* name; int age; double balance; Region region; const char* get_name() const { return (*this).name; } int get_age() const { return this->age; } double get_balance() const { return (*this)->balance; } short get_country_code() const { return Region::country_code; } short get_city_code() const { return region.city_code; } const char* get_city_name() const { return Region::city_name; } }; //====================== end of sample.cpp ========================== </pre> В каких методах обращения к членам объекта класса user типа User корректны?
<pre>//====================== start of sample.cpp ========================== #include <stdio.h> class Region; class Person { public: short m_age; const char* m_name; const char* m_surname; const char* m_region_name; Person(const char* name) : m_name(name) {} operator short () {return m_age;} operator const char* () {return "";} }; class Region { public: const char* region_name; const char* cheef_name; long size; Region(const char* region_nm = "") : region_name(region_nm) {} operator long () {return size;} operator const char* () {return region_name;} }; int main() { Person p1("Vasily Ivanov"); Region r; printf("Region number %u, driver %s", static_cast<unsigned short>(r), static_cast<const char*>(p1)); return 0; }//====================== end of sample.cpp ========================== </pre> Какие из имеющихся в файле sample.cpp конструкторов и операторов преобразования задействованы в операциях в функции main()?
<pre>//====================== start of sample.cpp ========================== class Region; class Person { public: short m_age; const char* m_name; const char* m_surname; const char* m_region_name; Person(const char* name) : m_name(name) {} operator short () {return m_age;} operator const char* () {return "";} operator Region* (); }; class Region { public: const char* region_name; const char* cheef_name; long size; Region(const char* region_nm) : region_name(region_nm) {} operator long () {return size;} operator const char* () {return region_name;} operator Person () {return Person(cheef_name);} }; Person::operator Region* () {return new Region(m_region_name);}//====================== end of sample.cpp ========================== </pre> Какие операторы преобразования класса Person не являются корректными с точки зрения архитектуры?
<pre>//====================== start of sample.cpp ========================== class Person { public: short m_age; const char* m_name; const char* m_surname; }; class Library { public: long m_books_count; std::string m_name; static std::string m_city; }; class Program { public: std::string prog_name; long version; void* prog_data; }; class Region { public: short country_code; short city_code; std::shared_ptr<Library< main_library; };//====================== end of sample.cpp ========================== </pre> Для какого из классов в фрагменте файла sample.cpp необходима реализация своего оператора копирования?
<pre>//====================== start of sample.cpp ========================== #include <vector> class Person { public: short m_age; const char* m_name; const char* m_surname; const char* m_region_name; }; class Region { public: const char* region_name; const char* cheef_name; long size; }; int main() { std::vector<unsigned char>* mybuffer = new std::vector<unsigned char>(sizeof(Person) + sizeof(Region), 0); Person* my_person = new (&(mybuffer->at(0))) Person(); my_person->~Person(); delete my_person; Region* p_region = new (&(mybuffer->at(0))) Region(); p_region->~Region(); delete p_region; delete mybuffer; return 0; }//====================== end of sample.cpp ========================== </pre> Какие операции освобождений ресурсов в файле sample.cpp являются лишними или ошибочными?
<pre>//====================== start of sample.cpp ========================== #include <vector> class Person { short m_age; const char* m_name; const char* m_surname; public: Person(short age, const char* name, const char* subname) : m_age(age), m_name(name), m_surname(subname){} Person() : m_name("unknown"){} }; class Reader: public Person { long m_ticket_number; public: Reader(long tick_numb = 0) : Person() , m_ticket_number(tick_numb) {} Reader(short age, const char* name, const char* surname, long tick_numb) : Person(age, name, surname) , m_ticket_number(tick_numb){} }; int main() { Reader reader1; Reader reader2 = 35; Reader reaedr3(22, "Vasily", "Ivanov", 123456); return 0; }//====================== end of sample.cpp ========================== </pre> Значения каких атрибутов каких объектов корректно инициализируются не нулевыми значениями?
<pre>//====================== start of sample.cpp ========================== struct Book { short year; char* author; char* name; }; class Person { short m_age; const char* m_name; const char* m_subname; public: Person(short age, const char* name, const char* subname) : m_age(age), m_name(name), m_subname(subname){} }; class Library { public: long m_books_count; char* m_name; char* m_city; Library(long books_count): m_books_count(books_count){} }; int main() { Book book1 = {"Owrell", 1984, "1984"}; Book book2 = {1984}; Person main_author = {65, "Bjarne", "Stroustrup"}; Person my_author(65, "Bjarne", "Stroustrup"); Library my_lib = 25; return 0; }//====================== end of sample.cpp ========================== </pre> Инициализация каких объектов в файле sample.cpp выполнена корректно?
<pre> //====================== start of sample.cpp ========================== union Lesson { long math_lection_number; short home_work_number; } my_lesson; class Lection { public: union { char* proffesor; short graduate_number; } main_person; union { short home_work_task; char *home_book_name; }; }; int main() { Lesson* pmy_lesson = &my_lesson; Lection my_lection; long lection = my_lesson.math_lection_number; short* phome_work = &(pmy_lesson->home_work_number); char* proffesor = my_lection.proffesor; short gr_number = my_lection.main_person.graduate_number; short my_task = Lection::home_work_task; const char * my_book = my_lection.home_book_name; return 0; } //====================== end of sample.cpp ========================== </pre> Присвоение данных класса каким переменным выполнено корректно (т.е. данные объявлены корректно и доступ к ним так же корректен) файле sample.cpp?
<pre>//====================== start of sample.cpp ========================== class Person { short m_age; char* m_name; char* m_subname; public: Person(short age, char* name, char* subname) : m_age(age), m_name(name), m_subname(subname){} }; class Library { public: long m_books_count; const char* m_name; const char* m_city; }; int main() { Library my_lib = {1240, "Main", "DefaultCity"}; Library *p_lib = new Library; Library empty_lib; Person any_person(25, "Djon","S"); Person *pother_person = new Person; return 0; }//====================== end of sample.cpp ========================== </pre> Инициализация каких объектов в файле sample.cpp выполняется корректно конструктором по умолчанию?
<pre> //====================== start of sample.cpp ========================== #include <type_traits> template <typename IT_1, typename IT_2, bool b> IT_2 copy_imp(IT_1 first, IT_1 last, IT_2 out, const std::integral_constant<bool, b>&) { while(first != last) { *out = *first; ++out; ++first; } return out; } template <typename T> T* copy_imp(const T* first, const T* last, T* out, const std::true_type&) { memmove(out, first, (last-first)*sizeof(T)); return out * (last-first); } template <typename I1, typename I2> inline I2 copy(I1 first, I1 last, I2 out) { typedef typename std::iterator_traits<I1>::value_type value_type; return copy_imp(first, last, out, std::has_trivial_assign<value_type>()); } class A {}; int main() { std::vector<short> arr1; std::vector<short> arr2; copy(arr1.begin(), arr1.end(), arr2.begin()); return 0; } //====================== end of sample.cpp ========================== </pre> Какие утверждения про используемую функцию копирования copy_impl() верны?
