2 ms·

I wish constexpr actually asked the compiler to evaluate an expression at compile time and not just a statement.

• WalterBright 3y ago
  In D, every part of the grammar that is a constant-expression must be compiled at compile time. For example: void test() { int square(int y) { return y * y; } int x = square(3); // evaluate at square at run time enum y = square(3); // evaluate at square compile time } (Although, when the optimizer gets through inlining square(), etc., it will wind up at compile time anyway.)
  • gumby 3y ago
    I think a compliant c++ implementation is allowed to do this and I think all do so at least for straightforward cases.
    • mhh__ 3y ago
      It's allowed to but you aren't allowed to assume.