constexpr phrasebook

  • compile-time — value known at compile time. More strict than regular q[ const ].
  • compiler enforced — if a constexpr doesn’t have a compile-time known-value, then compiler will complain
  • subset — constexpr objects are a subset of const objects
  • — usages:
  • integral NDTTP values such as std::array length parameter. See [[effModern]]
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