<pre> //====================== start of sample.cpp ========================== #include <vector> template <class Storage, int size> class Input { public: Input() : m_store(size) {} private: Storage m_store; }; int main() { Input<int,5> a1; Input<int,6> a2; Input<std::vector<int>,10> v3; Input<std::vector<short>,10> v4; Input<double, 30> *pMyInput = nullptr; return 0; } //====================== end of sample.cpp ========================== </pre> Сколько описаний пользовательских типов будет в скомпилированном коде из файла sample.cpp?
<pre> //====================== start of sample.cpp ========================== template <class Element, unsigned long max_size> class Storage { public: Storage(Element) {} }; template <class Element> class Storage <Element, 0 /* unlimited*/> { public: Storage(Element e) {} }; template <unsigned long max_size> class Storage <int, max_size> { public: Storage(int e) {} }; template <> class Storage<char*, 0> { public: Storage(char* s) {} }; template <> class Storage<char*, 100> { public: Storage(char* s) {} }; int main() { int p1=4; Storage<int, 5> st1(p1); Storage<char*, 100> st2(char* s); Storage<double, 80000> st3(double n); Storage<double, 0> st4(double n); return 0; } //====================== end of sample.cpp ========================== </pre> Какой из шаблонов Storage в файле sample.cpp не задействован в функции main в файле sample.cpp?
<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?
<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 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 ========================== template<typename T> typename T::difference_type my_diff( T& v1, T& v2); template<typename T> T my_diff2(T& v1, T& v2); class A { public: A(int in = 5); typedef short difference_type; difference_type operator-(A&); }; int main() { A i(5); A j(10); my_diff(i,j); int x = 5; int y = 10; my_diff(x,y); return 0; } //====================== end of sample.cpp ========================== </pre> Какие проблемы может решить использование идиомы SFINAE в вышеприведённом коде?
<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 ========================== 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 Region { short country_code; short city_code; char* city_name; public: Region(); short get_country_code() { return country_code; } inline short get_city_code() const; const char* get_city_name() const; }; Region::Region() : country_code(0) , city_code(0) , city_name(0) {} inline short Region::get_city_code() const { return city_code; } const char* Region::get_city_name() const { return city_name; } //====================== end of sample.cpp ========================== </pre> Какие из методов являются встроенными и объявлены корректно?
<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?
