Unlocking the Potential of Template Auto: Advantages in C 17
The introduction of template
Natural Extension of Auto for Template Instantiation
auto has been widely adopted for variable declarations, providing type deduction based on the assigned value. The extension of auto to template parameters further simplifies template instantiation by automatically determining the type of the parameter from its value. This eliminates the need for explicit type specification, offering a more concise and intuitive syntax.
Convenient and Explicit Type Deduction
The use of auto in template parameters enables type deduction even for non-type template parameters. For example, previously, the following constant template required verbose type declarations:
template <typename Type, Type value> constexpr Type constant = value;
With template
template <auto value> constexpr auto constant = value;
The compiler now automatically infers the type from the value assigned to value, making the code more readable and less error-prone.
Enhanced Variadic Template Handling
template
template <auto ... vs> struct HeterogenousValueList {}; using MyList1 = HeterogenousValueList<42, 'X', 13u>;
Similarly, homogenous value lists can be written succinctly:
template <auto v0, decltype(v0) ... vs> struct HomogenousValueList {}; using MyList2 = HomogenousValueList<1, 2, 3>;
Conclusion
template
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