for constexpr ()
for consteval ()
 
while constexpr ()
while consteval ()
 
do constexpr {} while ()
do consteval {} while ()
 
example:
 
for consteval (int i{ 0 }; i < 1’000’000; ++i) {
    cout << "LOL”;
}

Runtime speed is FAST, w/ these loops.

Easy to implement, too.