١٤ - سلسلة تعلم سي بلس بلس: Enumerations

ahmedeldeep · 18 يوليو 2022، 9:10م

يحتوي الفيديو على شرح للقاط الاتية

00:00 - Intro
01:12 - Enumerations
03:49 - enum classes
07:32 - enum underlying type
09:25 - enum Operators

تحميل ملف العرض
14 Enumerations.pdf (411.6% u)

الأمثلة

ahmedeldeep/cpp-course/blob/master/05-user-types/10-enum.cc


// Enumerations
// Reference: The C++ Programming Language (4th Edition), Bjarne Stroustrup

#include <iostream>

enum class Traffic_light { red, yellow, green };
enum class Warning { green, yellow, orange, red };

// Warning a1 = 7;                     // error : no int->Warning conversion
// int a2 = green;                     // error: green not in scope
// int a3 = Warning::green;            // error : no Warning->int conversion
// Warning a4 = Traffic_light::green;  // error : different types
// Warning a5 = Warning::green;        // OK

// enum class Warning : int { green, yellow, orange, red };
// enum class Warning : char { green, yellow, orange, red };

void print_warning_enum() {
  std::cout << static_cast<int>(Warning::green) << std::endl;

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github.com

ahmedeldeep/cpp-course/blob/master/05-user-types/11-enum-operators.cc


// Enumerations
// Reference: The C++ Programming Language (4th Edition), Bjarne Stroustrup

#include <iostream>

enum class StatusFlags {
  data_received = 0x1,
  rx_buffer_full = 0x2,
  rx_error = 0x4,
  data_transmitted = 0x8,
  tx_buffer_empty = 0x10,
  tx_error = 0x20,
};

constexpr StatusFlags operator|(StatusFlags a, StatusFlags b) {
  return static_cast<StatusFlags>(static_cast<int>(a) | static_cast<int>(b));
}
constexpr StatusFlags operator&(StatusFlags a, StatusFlags b) {
  return static_cast<StatusFlags>(static_cast<int>(a) & static_cast<int>(b));

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