Move a few examples in and out of chapter 1

chapter_01/examples/consteval.cc

+#include <algorithm>
+#include <ranges>
+namespace sr = std::ranges;
+namespace sv = sr::views;
+
+consteval auto is_prime(unsigned N) -> bool
+{
+    return sr::none_of(
+        sv::iota(2U) 
+          | sv::take_while([=](auto i) { return i * i <= N; }),
+        [=](auto i){ return N % i == 0; });
+}
+
+auto main() -> int
+{
+    return (sr::fold_left(
+        sv::iota(2U)
+          | sv::filter([](unsigned i) { return is_prime(i); })
+          | sv::take(10U),
+        0UL, 
+        std::plus<unsigned long>{}));
+}
+

chapter_01/examples/iotaloop.cc

+#include <print>
+#include <ranges>
+
+namespace sr = std::ranges;
+namespace sv = sr::views;
+
+auto main() -> int
+{
+    for (auto i : sv::iota(10, 15)) std::print("{}\n", i);
+}
+
+

chapter_01/examples/iotaloop2.cc

+#include <print>
+#include <ranges>
+
+namespace sr = std::ranges;
+namespace sv = sr::views;
+auto divisible_by_4(int i) -> bool
+{
+    return i % 4 == 0;
+}
+auto main() -> int
+{
+    for (auto i : sv::iota(1, 500) | sv::filter(divisible_by_4))
+        std::print("{}\n", i);
+}
+
+

chapter_01/solutions/iotaloop3.cc

+#include <print>
+#include <ranges>
+
+namespace sr = std::ranges;
+namespace sv = sr::views;
+auto my_selection(int i) -> bool
+{
+    return (i - 10) % 7 == 0;
+}
+auto main() -> int
+{
+    for (auto i : sv::iota(-50, 50) | sv::filter(my_selection))
+        std::print("{}\n", i);
+}
+
+