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Move Semantics & Rvalue References (&&)
std::move, avoiding deep copies of heap resources, and move constructors
Introduced in C++11, Move Semantics eliminate unnecessary deep copies of temporary objects by transferring resource ownership (pointers) directly via Rvalue References (&&).
Lvalues vs Rvalues and std::move
Lvalue: An object with an identifiable memory address that persists beyond a single expression (e.g. named variables).
Rvalue: A temporary value that does not persist (e.g. return values from functions, string literals).
std::move(lval): Casts an lvalue to an rvalue reference, allowing its internal heap buffers to be "stolen" by move constructors rather than copied.
#include <iostream>
#include <vector>
#include <string>
int main() {
std::string heavyData = "Multi-megabyte dataset string...";
// std::move transfers pointer ownership without copying memory!
std::string destination = std::move(heavyData);
std::cout << "Destination: " << destination.substr(0, 14) << "..." << std::endl;
// heavyData is now in a valid but empty moved-from state!
std::cout << "Original size: " << heavyData.size() << std::endl; // 0
return 0;
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Test Yourself With Exercise
What does `std::move()` actually do in Modern C++?