From 6bcd79b997f321678c763b5b8bfec6284202b0c3 Mon Sep 17 00:00:00 2001
From: ISSOtm <me@eldred.fr>
Date: Sun, 26 Apr 2026 14:43:57 +0200
Subject: [PATCH] Revert "Derive `operator!=` from `operator==` (#1660)"

This reverts commit 993879a2edde50e6cd7da7afa731b194f67bbd1d.
---
 include/gfx/rgba.hpp     | 1 +
 include/itertools.hpp    | 2 ++
 include/link/section.hpp | 1 +
 src/gfx/pal_packing.cpp  | 1 +
 src/gfx/process.cpp      | 1 +
 5 files changed, 6 insertions(+)

diff --git a/include/gfx/rgba.hpp b/include/gfx/rgba.hpp
index b86968b9..c87ad1b1 100644
--- a/include/gfx/rgba.hpp
+++ b/include/gfx/rgba.hpp
@@ -40,6 +40,7 @@ struct Rgba {
 	}
 
 	bool operator==(Rgba const &rhs) const { return toCSS() == rhs.toCSS(); }
+	bool operator!=(Rgba const &rhs) const { return !operator==(rhs); }
 
 	// CGB colors are RGB555, so we use bit 15 to signify that the color is transparent instead
 	// Since the rest of the bits don't matter then, we return 0x8000 exactly.
diff --git a/include/itertools.hpp b/include/itertools.hpp
index fb3ef59c..0a25c051 100644
--- a/include/itertools.hpp
+++ b/include/itertools.hpp
@@ -97,6 +97,7 @@ class EnumSeq {
 		EnumT operator*() const { return _value; }
 
 		bool operator==(Iterator const &rhs) const { return _value == rhs._value; }
+		bool operator!=(Iterator const &rhs) const { return !operator==(rhs); }
 	};
 
 public:
@@ -131,6 +132,7 @@ public:
 	bool operator==(ZipIterator const &rhs) const {
 		return std::get<0>(_iters) == std::get<0>(rhs._iters);
 	}
+	bool operator!=(ZipIterator const &rhs) const { return !operator==(rhs); }
 };
 
 // Only needed inside `zip` below.
diff --git a/include/link/section.hpp b/include/link/section.hpp
index 0fb3ba36..029dc059 100644
--- a/include/link/section.hpp
+++ b/include/link/section.hpp
@@ -70,6 +70,7 @@ private:
 			SectionT &operator*() const { return *_piece; }
 
 			bool operator==(Iterator const &rhs) const { return _piece == rhs._piece; }
+			bool operator!=(Iterator const &rhs) const { return !operator==(rhs); }
 		};
 
 	public:
diff --git a/src/gfx/pal_packing.cpp b/src/gfx/pal_packing.cpp
index 06257f6d..d9e32c0f 100644
--- a/src/gfx/pal_packing.cpp
+++ b/src/gfx/pal_packing.cpp
@@ -100,6 +100,7 @@ private:
 		AssignedSetsIter() = default;
 
 		bool operator==(AssignedSetsIter const &rhs) const { return _iter == rhs._iter; }
+		bool operator!=(AssignedSetsIter const &rhs) const { return !operator==(rhs); }
 
 		AssignedSetsIter &operator++() {
 			++_iter;
diff --git a/src/gfx/process.cpp b/src/gfx/process.cpp
index 4d0673ba..1c2c6f44 100644
--- a/src/gfx/process.cpp
+++ b/src/gfx/process.cpp
@@ -263,6 +263,7 @@ struct Image {
 			}
 
 			bool operator==(Iterator const &rhs) const { return coords() == rhs.coords(); }
+			bool operator!=(Iterator const &rhs) const { return !operator==(rhs); }
 		};
 
 	public: