KITFORMA · EDITORIAL GUIDE
Why does std::move on a const value still copy?
KitForma editorial guide. std::move changes expression category; it neither removes const nor forces a move overload to exist. A normal non-const rvalue-reference move constructor cannot consume a const source.
Step-by-step guidance
std::move changes expression category; it neither removes const nor forces a move overload to exist. A normal non-const rvalue-reference move constructor cannot consume a const source.
Keep the source non-const when transfer is intended, or accept copying when immutability is required. Inspect actual constructor overloads and access rules. Do not cast away const to force mutation of an object actually defined const.
Instrument a tiny type’s constructors and compare const versus non-const sources. Some types deliberately lack move support and fall back to copying. Measurements must use the real type and build settings; the spelling std::move alone is not a performance guarantee.
Sources and verification
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