Add random::generator formatter

libs/random/include/psemek/random/generator.hpp

@@ -2,6 +2,7 @@
 
 #include <cstdint>
 #include <limits>
+#include <format>
 
 #include <psemek/random/device.hpp>
 
@@ -66,6 +67,9 @@ namespace psemek::random
 			read(stream, gen.inc_);
 		}
 
+		template <typename T, typename Char>
+		friend struct std::formatter;
+
 	private:
 		std::uint64_t state_ = 0;
 		std::uint64_t inc_ = 0;
@@ -78,3 +82,21 @@ namespace psemek::random
 	};
 
 }
+
+namespace std
+{
+
+	template <typename Char>
+	struct formatter<::psemek::random::generator, Char>
+		: formatter<std::uint64_t>
+	{
+		using base = formatter<std::uint64_t>;
+
+		template <typename FormatContext>
+		auto format(::psemek::random::generator const & rng, FormatContext & ctx) const
+		{
+			return std::format_to(ctx.out(), "({}, {})", rng.state_, rng.inc_);
+		}
+	};
+
+}