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Templates and Generic Programming · 4:00
Type Deduction
How the compiler works out T. We feed an int, a const int and a reference to a const int through three lanes (T&, T&& and T by value) and read the results straight from the compiler, then see arrays decay or keep their length, where auto breaks the pattern with braces, why decltype((x)) is a reference, and how to make the compiler print a deduced type.
You will learn
- Predict T and the parameter type for T&, T&& and by-value parameters
- Explain array decay and use arraySize to read a length at compile time
- Spot the one place auto deduction differs from templates
- Use decltype correctly and make the compiler reveal a deduced type