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.
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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.
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