٨ - سلسلة تعلم سي بلس بلس: References

ahmedeldeep · 15 يونيو 2022، 4:49م

يحتوي الفيديو على شرح للقاط الاتية

00:00 - Intro
00:06 - What is a Reference
03:03 - Reference Types
05:18 - lvalue References
08:55 - const References
10:49 - Pass by Reference
14:25 - rvalue References
16:31 - Example - rvalue Reference
22:09 - References to References

تحميل ملف العرض
08 References.pdf (464.1% u)

الأمثلة

github.com

ahmedeldeep/cpp-course/blob/master/04-references/01-references.cc


// References
// From: The C++ Programming Language (4th Edition), Bjarne Stroustrup

#include <iostream>

void increment(int &aa) { ++aa; }
void f() {
  int x = 1;
  increment(x);  // x=2
}

int var = 20;
int &fun1() { return var; }

int main() {
  //
  int x{10};
  int &x1{x};  // ok: x1 is a lvalue reference
  ++x1;

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github.com

ahmedeldeep/cpp-course/blob/master/04-references/02-rvalue-reference.cc


// References

#include <iostream>
#include <string>

std::string get_long_string() {
  return "This function returns very looooong string, which will be expansive "
         "to copy ";
}

int main() {
  //
  std::string str = get_long_string();

  std::string& r1{str};  // lvalue reference, bind r1 to var (an lvalue)

  std::string& r2{get_long_string()};  // error can not bind lvalue reference,
                                       // to temporary(rvalue)
  const std::string& r3{get_long_string()};  // ok: const can bind to rvalue

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