Rvalue References Overview
Rvalue references, introduced in C++11, use the syntax T&&. They allow functions to distinguish between lvalues and rvalues, enabling move semantics.
main.cpp
12345678910111213141516171819#include <iostream> void process(int& x) { std::cout << "Lvalue reference called with " << x << std::endl; } void process(int&& x) { std::cout << "Rvalue reference called with " << x << std::endl; } int main() { int a = 42; process(a); // lvalue, calls process(int&) process(99); // rvalue, calls process(int&&) process(std::move(a)); // rvalue, calls process(int&&) }
Notice in the example above how the function overloads are selected based on whether the argument is an lvalue or an rvalue. This distinction is the foundation for move semantics.
Kiitos palautteestasi!
Kysy tekoälyä
Kysy tekoälyä
Kysy mitä tahansa tai kokeile jotakin ehdotetuista kysymyksistä aloittaaksesi keskustelumme
Can you explain the difference between lvalues and rvalues?
What are move semantics and why are they important?
Can you provide an example demonstrating move semantics in C++?
Mahtavaa!
Completion arvosana parantunut arvoon 10Rvalue References Overview
Pyyhkäise näyttääksesi valikon
Rvalue references, introduced in C++11, use the syntax T&&. They allow functions to distinguish between lvalues and rvalues, enabling move semantics.
main.cpp
12345678910111213141516171819#include <iostream> void process(int& x) { std::cout << "Lvalue reference called with " << x << std::endl; } void process(int&& x) { std::cout << "Rvalue reference called with " << x << std::endl; } int main() { int a = 42; process(a); // lvalue, calls process(int&) process(99); // rvalue, calls process(int&&) process(std::move(a)); // rvalue, calls process(int&&) }
Notice in the example above how the function overloads are selected based on whether the argument is an lvalue or an rvalue. This distinction is the foundation for move semantics.
Kiitos palautteestasi!
