From 2adaaa4c52b731dc7d796baa978ea86fd26d24b8 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Tue, 18 Aug 2026 14:28:04 +0200
Subject: kstd: enable formatting and decay for bytes

---
 libs/kstd/kstd/bits/basic_unit.hpp |  4 ++--
 libs/kstd/kstd/units.hpp           | 12 +++++++++++-
 2 files changed, 13 insertions(+), 3 deletions(-)

(limited to 'libs')

diff --git a/libs/kstd/kstd/bits/basic_unit.hpp b/libs/kstd/kstd/bits/basic_unit.hpp
index c7f794ea..750b0da6 100644
--- a/libs/kstd/kstd/bits/basic_unit.hpp
+++ b/libs/kstd/kstd/bits/basic_unit.hpp
@@ -8,7 +8,7 @@ namespace kstd
 {
 
   //! A basic template for strongly typed units.
-  template<typename ValueType, typename Tags>
+  template<typename ValueType, typename Tags, bool ImplicitDecay = false>
   struct basic_unit
   {
     using value_type = ValueType;
@@ -22,7 +22,7 @@ namespace kstd
     {}
 
     template<std::integral T>
-    explicit constexpr operator T() const noexcept
+    explicit(!ImplicitDecay) constexpr operator T() const noexcept
     {
       return value;
     }
diff --git a/libs/kstd/kstd/units.hpp b/libs/kstd/kstd/units.hpp
index 61224336..95e531b8 100644
--- a/libs/kstd/kstd/units.hpp
+++ b/libs/kstd/kstd/units.hpp
@@ -2,6 +2,7 @@
 #define KSTD_UNITS_HPP
 
 #include <kstd/bits/basic_unit.hpp>
+#include <kstd/format.hpp>
 #include <kstd/result.hpp>
 #include <kstd/system_error.hpp>
 
@@ -11,7 +12,7 @@
 namespace kstd
 {
 
-  using bytes = basic_unit<std::size_t, struct bytes_tag>;
+  using bytes = basic_unit<std::size_t, struct bytes_tag, true>;
 
   using offset = basic_unit<std::ptrdiff_t, struct byte_offset_tag>;
 
@@ -127,4 +128,13 @@ namespace kstd
 
 }  // namespace kstd
 
+template<>
+struct kstd::formatter<kstd::bytes> : kstd::formatter<std::size_t>
+{
+  constexpr auto format(kstd::bytes const & id, kstd::format_context & ctx) const -> void
+  {
+    kstd::formatter<std::size_t>::format(id.value, ctx);
+    ctx.push(" bytes");
+  }
+};
 #endif
-- 
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