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Multiple ChoiceHard 45s

Concepts vs SFINAE error quality

Relative to SFINAE enable_if tricks, C++20 concepts primarily improve:
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  1. 1Readability, overload ordering (subsumption), and far better diagnostic messages.
  2. 2Runtime dispatch speed, by generating a vtable for each constrained instantiation.
  3. 3Binary size, by removing the need to instantiate every template that would otherwise be generated.
  4. 4Accepting unconstrained types that would fail substitution under plain SFINAE.
cppconceptstemplatesc++20

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