Is there any difference between constexpr and consteval ?
consteval int x1 = 2;
constexpr int x2 = 5;
Is it better to use constexpr than consteval?
consteval vs constexpr on variables
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1 Answers
The standard actually says:
The consteval specifier shall be applied only to the declaration of a function or function template.
So your first example should not compile.
However, you can put consteval or constexpr on functions:
constexpr int foo (int x) { return x; }
consteval int bar (int x) { return x; }
constexpr when applied to a function is merely largely advisory (see Davis Herring's comment) - it says to the compiler, evaluate this function call at compile time if you can.
consteval, on the other hand, is mandatory - it says to the compiler, generate an error if you cannot evaluate this function call at compile time.
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