From b156ee3141f9609300d7f54368787da79aa0a9fe Mon Sep 17 00:00:00 2001
From: Gary Talent <gary@drinkingtea.net>
Date: Fri, 9 Jun 2023 22:07:19 -0500
Subject: [PATCH] [ox/std] Add UUID::toString variant that takes a Writer_c

(synced from bb85e6ab6c834a110b48c19713ea51fa25f622a9)
---
 src/ox/std/uuid.hpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/ox/std/uuid.hpp b/src/ox/std/uuid.hpp
index 6a049e042..031222bef 100644
--- a/src/ox/std/uuid.hpp
+++ b/src/ox/std/uuid.hpp
@@ -145,6 +145,33 @@ class UUID {
 			return out;
 		}
 
+		[[nodiscard]]
+		constexpr ox::Error toString(Writer_c auto &writer) const noexcept {
+			auto valueI = 0u;
+			constexpr auto printChars = [](
+					Writer_c auto &writer,
+					const Array<uint8_t, 16> &value,
+					std::size_t cnt,
+					unsigned &valueI) {
+				for (auto i = 0u; i < cnt; ++i) {
+					const auto v = value[valueI];
+					const auto h = detail::toHex(v);
+					oxIgnoreError(writer.write(h.c_str(), h.len()));
+					++valueI;
+				}
+			};
+			printChars(writer, m_value, 4, valueI);
+			oxReturnError(writer.put('-'));
+			printChars(writer, m_value, 2, valueI);
+			oxReturnError(writer.put('-'));
+			printChars(writer, m_value, 2, valueI);
+			oxReturnError(writer.put('-'));
+			printChars(writer, m_value, 2, valueI);
+			oxReturnError(writer.put('-'));
+			printChars(writer, m_value, 6, valueI);
+			return {};
+		}
+
 		[[nodiscard]]
 		constexpr UUIDStr toString() const noexcept {
 			UUIDStr out;