Advanced · Module 9 · Lesson 7 of 7
Variadic Templates and Perfect Forwarding
Accept any number of typed arguments, preserve their value categories, and build generic factories without accidental copies.
Pro — members onlyAbout 12 minutes
By the end you can
- Explain parameter packs and fold expressions
- Distinguish lvalues, rvalues and forwarding references
- Use std::forward safely at a generic boundary
Builds on Compile-Time Programming: constexpr, consteval and static_assert.
01 · A question first
A generic factory should construct a type from any constructor arguments without copying lvalues or turning rvalues into expensive lvalues. How can one function accept zero, one or many arguments while preserving what the caller gave it?
Make a guess before you read on.
02 · The idea
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What's inside
- Start with the problem
- How the idea works
- Why it is correct
- What it costs
- Pitfalls and variations
- Production guidance
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